Usage Of Varchar/nvarchar Data Types
Oct 2, 2007
I am coming to SQL Server from Access and using it mostly for making ASP.NET web apps.
I am not sure I correctly understand the characteristics of the varchar data type and I'm so far unable to find a basic explanation.
It seems that the benefit of this data type is that the actual disk storage involved varies according to what is in a given record's column. So for a column defined as varchar(500), a record where the column uses all 500 characters will use more bytes on disk than a record where the column uses only one.
This would seem to imply that unless there were some reason to limit the characters allowed into a column, it would be an advantage to define large columns, say varchar(8000), especially for memo type fields, or fields such as addresses where it seems like clients are always asking for more space as time passes.
Is this right? Is there any downside to defining large varchar columns assuming they do not conflict with business rules?
Many thanks
Mike Thomas
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Dec 20, 2007
What are the drawbacks with using a varchar max datatype? varchar stretches on insert/edit to fit the required amount of data (yes/no), IM gussing this makes it slower? I don't think I can Avoid using this data type, but should I try to avoid its usage if possible,
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Jul 27, 2007
Could someone please help me by explaining which one is best to use and when? For example, storing the word "Corona Del Mar" - which Data Type would be suggested?
Thanks.
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Jan 4, 2008
I am trying to create a store procedure inside of SQL Management Studio console and I kept getting errors. Here's my store procedure.
Code Block
CREATE PROCEDURE [dbo].[sqlOutlookSearch]
-- Add the parameters for the stored procedure here
@OLIssueID int = NULL,
@searchString varchar(1000) = NULL
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
IF @OLIssueID <> 11111
SELECT * FROM [OLissue], [Outlook]
WHERE [OLissue].[issueID] = @OLIssueID AND [OLissue].[issueID] = [Outlook].[issueID] AND [Outlook].[contents] LIKE + ''%'' + @searchString + ''%''
ELSE
SELECT * FROM [Outlook]
WHERE [Outlook].[contents] LIKE + ''%'' + @searchString + ''%''
END
And the error I kept getting is:
Msg 402, Level 16, State 1, Procedure sqlOutlookSearch, Line 18
The data types varchar and varchar are incompatible in the modulo operator.
Msg 402, Level 16, State 1, Procedure sqlOutlookSearch, Line 21
The data types varchar and varchar are incompatible in the modulo operator.
Any help is appreciated.
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Apr 23, 2008
I am working on a survey system with another DB Engineer.Our current design includes 1 table per Question Type (Numeric, Boolean, Text), Response values are tightly coupled based on data being entered, to keep things simple assume there are only 6 tables in this this system (1 for each Question Type to define the "rules" of the data entered, and 1 for each Response collection).He is a former .Net programmer and has been talking with the .Net guys on the project and he is proposing that we abstract our Question Types to use one table and store the Input Values all as nvarchar(max).This obviously simplifies the DB design and reduces the amount of work I will need to do so I should be all for it. I guess I am a little concerned that we are no longer tightly coupling the data types and essentially leaving all the validation up to the application. Also should I be worried that a bunch of bit data will be stored as 1/0 in an nvarchar(max) column?Thanks,-John
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Jun 24, 2006
The following is the full error message. I am posting the code after.
Server Error in '/XprtDr' Application.
The data types text and nvarchar are incompatible in the equal to operator.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: The data types text and nvarchar are incompatible in the equal to operator.Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:
[SqlException (0x80131904): The data types text and nvarchar are incompatible in the equal to operator.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +95
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +82
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +346
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +3244
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +186
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +1121
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +334
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +407
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +149
System.Web.UI.WebControls.SqlDataSourceView.ExecuteDbCommand(DbCommand command, DataSourceOperation operation) +493
System.Web.UI.WebControls.SqlDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +915
System.Web.UI.DataSourceView.Update(IDictionary keys, IDictionary values, IDictionary oldValues, DataSourceViewOperationCallback callback) +179
System.Web.UI.WebControls.FormView.HandleUpdate(String commandArg, Boolean causesValidation) +1197
System.Web.UI.WebControls.FormView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +545
System.Web.UI.WebControls.FormView.OnBubbleEvent(Object source, EventArgs e) +163
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +56
System.Web.UI.WebControls.FormViewRow.OnBubbleEvent(Object source, EventArgs e) +118
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +56
System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +106
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +177
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +31
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +32
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +242
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3838
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42
--------------------------------------------------------------------------------------------------------------------------
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="CompanyDetails.aspx.vb" Inherits="CompanyDetails" %>
<%@ Register Assembly="EasyListBox" Namespace="ELB" TagPrefix="ELB" %>
<!--
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
If User.Identity.IsAuthenticated = False Then
Server.Transfer("login.aspx")
Else
Me.uId.Text = Membership.GetUser().ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:TextBox ID="uId" runat="server" Style="z-index: 100; left: 456px; position: absolute;
top: 512px" Visible="False" Width="4px"></asp:TextBox>
<table style="z-index: 101; left: 24px; width: 572px; position: absolute; top: 44px;
height: 404px">
<tr>
<td style="width: 2px; height: 10px">
</td>
<td style="width: 651px; height: 10px">
</td>
<td style="width: 5px; height: 10px">
</td>
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<tr>
<td style="width: 2px; height: 435px">
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<td style="width: 651px; height: 435px">
<asp:FormView ID="FormView1" runat="server" BackColor="White" BorderColor="#DEDFDE"
BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="indexNo" DataSourceID="CompanyDetails_MainForm"
ForeColor="Black" GridLines="Vertical" Height="500px" Style="z-index: 32; left: 12px;
position: absolute; top: 28px" Width="600px">
<FooterStyle BackColor="#CCCC99" />
<EditRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<EditItemTemplate>
<asp:Label ID="TitleLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 20px" Text='Name:' Width="100px" ></asp:Label>
<asp:label ID="TitleTextBox" runat="server" Style=" z-index: 100; left: 120px; position: absolute;
top: 20px" Text='<%# Bind("Title") %>' Width="450px"></asp:label>
<asp:Label ID="YearEstLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 50px" Text='Established:' Width="100px" ></asp:Label>
<asp:TextBox ID="yearEstTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 50px" Text='<%# Bind("yearEst") %>' Width="50px" ></asp:TextBox>
<asp:Label ID="EmployeeCountLabelEdit" runat="server" Style="z-index: 100; left: 375px; position: absolute;
top: 50px" Text='No. of Employees:' Width="140px" ></asp:Label>
<asp:TextBox ID="employeeCountTextBox" runat="server" Style="z-index: 100; left: 535px; position: absolute;
top: 50px" Text='<%# Bind("employeeCount") %>' Width="35px" ></asp:TextBox>
<asp:Label ID="Address1LabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 80px" Text='Address:' Width="100px" ></asp:Label>
<asp:TextBox ID="Address_1TextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 80px" Width="450px" Text='<%# Bind("Address_1") %>'></asp:TextBox>
<asp:Label ID="Address2LabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 110px" Text='Address2:' Width="100px" ></asp:Label>
<asp:Label ID="Adress2OptionalLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 125px" Text='(Optional):' Width="100px" ></asp:Label>
<asp:TextBox ID="Address_2TextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 110px" Width="450px" Text='<%# Bind("Address_2") %>'></asp:TextBox>
<asp:Label ID="ContactsLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 160px" Text='Contacts:' Width="100px" ></asp:Label>
<asp:TextBox ID="ContactsTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 160px" Width="450px" Text='<%# Bind("Contacts") %>'></asp:TextBox>
<asp:Label ID="TelNosLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 190px" Text='Telephone Nos.:' Width="115px" ></asp:Label>
<asp:TextBox ID="TelNosTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 190px" Width="450px" Text='<%# Bind("TelNos") %>'></asp:TextBox>
<asp:Label ID="FaxNosLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 220px" Text='Fax Nos.:' Width="100px" ></asp:Label>
<asp:TextBox ID="FaxNosTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 220px" Width="450px" Text='<%# Bind("FaxNos") %>'></asp:TextBox>
<asp:Label ID="EmailLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 250px" Text='E-mail:' Width="100px" ></asp:Label>
<asp:TextBox ID="emailAddressesTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 250px" Width="450px" Text='<%# Bind("emailAddresses") %>'></asp:TextBox><br />
<asp:Label ID="WebsiteLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 280px" Text='Website:' Width="100px" ></asp:Label>
<asp:TextBox ID="WebsiteTextBox" runat="server" Style="z-index: 100; left: 120px; position: absolute;
top: 280px" Width="450px" Text='<%# Bind("Website") %>'></asp:TextBox>
<asp:Label ID="ManufacturingSectorLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 310px" Text='Manufacturing' Width="100px" ></asp:Label>
<asp:Label ID="ManufacturingSubSectorsLabel2Edit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 325px" Text='Sub-sectors:' Width="100px" ></asp:Label>
<asp:Label ID="ServicesSubSectorsLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 355px" Text='Services' Width="100px" ></asp:Label>
<asp:Label ID="ServicesSubSectorsLabel2Edit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 370px" Text='Sub-sectors:' Width="100px" ></asp:Label>
<asp:Label ID="ImportSourcesLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 390px" Text='Import Sources:' Width="100px" ></asp:Label>
<asp:Label ID="ExportDestinationsLabelEdit" runat="server" Style="z-index: 100; left: 5px; position: absolute;
top: 420px" Text='Export Destinations:' Width="100px" ></asp:Label>
<asp:LinkButton ID="UpdateButton" runat="server" style="z-index: 100;left: 5px; position:absolute; top: 460px" CausesValidation="True" CommandName="Update"
Text="Update"></asp:LinkButton>
<asp:LinkButton ID="UpdateCancelButton" runat="server" style="z-index: 100;left: 70px; position:absolute; top: 460px" CausesValidation="False" CommandName="Cancel"
Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<RowStyle BackColor="#F7F7DE" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<InsertItemTemplate>
indexNo:
<asp:TextBox ID="indexNoTextBox" runat="server" Text='<%# Bind("indexNo") %>'>
</asp:TextBox><br />
userName:
<asp:TextBox ID="userNameTextBox" runat="server" Text='<%# Bind("userName") %>'>
</asp:TextBox><br />
Title:
<asp:TextBox ID="TitleTextBox" runat="server" Text='<%# Bind("Title") %>'>
</asp:TextBox><br />
yearEst:
<asp:TextBox ID="yearEstTextBox" runat="server" Text='<%# Bind("yearEst") %>'>
</asp:TextBox><br />
employeeCount:
<asp:TextBox ID="employeeCountTextBox" runat="server" Text='<%# Bind("employeeCount") %>'>
</asp:TextBox><br />
Address_1:
<asp:TextBox ID="Address_1TextBox" runat="server" Text='<%# Bind("Address_1") %>'>
</asp:TextBox><br />
Address_2:
<asp:TextBox ID="Address_2TextBox" runat="server" Text='<%# Bind("Address_2") %>'>
</asp:TextBox><br />
Contacts:
<asp:TextBox ID="ContactsTextBox" runat="server" Text='<%# Bind("Contacts") %>'>
</asp:TextBox><br />
TelNos:
<asp:TextBox ID="TelNosTextBox" runat="server" Text='<%# Bind("TelNos") %>'>
</asp:TextBox><br />
FaxNos:
<asp:TextBox ID="FaxNosTextBox" runat="server" Text='<%# Bind("FaxNos") %>'>
</asp:TextBox><br />
emailAddresses:
<asp:TextBox ID="emailAddressesTextBox" runat="server" Text='<%# Bind("emailAddresses") %>'>
</asp:TextBox><br />
Website:
<asp:TextBox ID="WebsiteTextBox" runat="server" Text='<%# Bind("Website") %>'>
</asp:TextBox><br />
ManufacturingSubSectors_id:
<asp:TextBox ID="ManufacturingSubSectors_idTextBox" runat="server" Text='<%# Bind("ManufacturingSubSectors_id") %>'>
</asp:TextBox><br />
ServicesSubSectors_id:
<asp:TextBox ID="ServicesSubSectors_idTextBox" runat="server" Text='<%# Bind("ServicesSubSectors_id") %>'>
</asp:TextBox><br />
ExportDestinations_id:
<asp:TextBox ID="ExportDestinations_idTextBox" runat="server" Text='<%# Bind("ExportDestinations_id") %>'>
</asp:TextBox><br />
ImportSources_id:
<asp:TextBox ID="ImportSources_idTextBox" runat="server" Text='<%# Bind("ImportSources_id") %>'>
</asp:TextBox><br />
<asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert"
Text="Insert">
</asp:LinkButton>
<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
Text="Cancel">
</asp:LinkButton>
</InsertItemTemplate>
<ItemTemplate>
Title:
<asp:Label ID="TitleLabel" runat="server" Text='<%# Bind("Title") %>'></asp:Label><br />
yearEst:
<asp:Label ID="yearEstLabel" runat="server" Text='<%# Bind("yearEst") %>'></asp:Label><br />
employeeCount:
<asp:Label ID="employeeCountLabel" runat="server" Text='<%# Bind("employeeCount") %>'></asp:Label><br />
Address_1:
<asp:Label ID="Address_1Label" runat="server" Text='<%# Bind("Address_1") %>'></asp:Label><br />
Address_2:
<asp:Label ID="Address_2Label" runat="server" Text='<%# Bind("Address_2") %>'></asp:Label><br />
Contacts:
<asp:Label ID="ContactsLabel" runat="server" Text='<%# Bind("Contacts") %>'></asp:Label><br />
TelNos:
<asp:Label ID="TelNosLabel" runat="server" Text='<%# Bind("TelNos") %>'></asp:Label><br />
FaxNos:
<asp:Label ID="FaxNosLabel" runat="server" Text='<%# Bind("FaxNos") %>'></asp:Label><br />
emailAddresses:
<asp:Label ID="emailAddressesLabel" runat="server" Text='<%# Bind("emailAddresses") %>'></asp:Label><br />
Website:
<asp:Label ID="WebsiteLabel" runat="server" Text='<%# Bind("Website") %>'></asp:Label><br />
ManufacturingSubSectors_id:
<asp:Label ID="ManufacturingSubSectors_idLabel" runat="server" Text='<%# Bind("ManufacturingSubSectors_id") %>'></asp:Label><br />
ServicesSubSectors_id:
<asp:Label ID="ServicesSubSectors_idLabel" runat="server" Text='<%# Bind("ServicesSubSectors_id") %>'></asp:Label><br />
ExportDestinations_id:
<asp:Label ID="ExportDestinations_idLabel" runat="server" Text='<%# Bind("ExportDestinations_id") %>'></asp:Label><br />
ImportSources_id:
<asp:Label ID="ImportSources_idLabel" runat="server" Text='<%# Bind("ImportSources_id") %>'></asp:Label><br />
<asp:LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit"
Text="Edit"></asp:LinkButton>
</ItemTemplate>
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
</asp:FormView>
<asp:SqlDataSource ID="CompanyDetails_MainForm" runat="server" ConflictDetection="CompareAllValues"
ConnectionString="<%$ ConnectionStrings:ConnectionString_companyDetails %>" DeleteCommand="DELETE FROM [companyDetails] WHERE [indexNo] = @original_indexNo AND [userName] = @original_userName AND [Title] = @original_Title AND [yearEst] = @original_yearEst AND [employeeCount] = @original_employeeCount AND [Address_1] = @original_Address_1 AND [Address_2] = @original_Address_2 AND [Contacts] = @original_Contacts AND [TelNos] = @original_TelNos AND [FaxNos] = @original_FaxNos AND [emailAddresses] = @original_emailAddresses AND [Website] = @original_Website AND [ManufacturingSubSectors_id] = @original_ManufacturingSubSectors_id AND [ServicesSubSectors_id] = @original_ServicesSubSectors_id AND [ExportDestinations_id] = @original_ExportDestinations_id AND [ImportSources_id] = @original_ImportSources_id"
InsertCommand="INSERT INTO [companyDetails] ([indexNo], [userName], [Title], [yearEst], [employeeCount], [Address_1], [Address_2], [Contacts], [TelNos], [FaxNos], [emailAddresses], [Website], [ManufacturingSubSectors_id], [ServicesSubSectors_id], [ExportDestinations_id], [ImportSources_id]) VALUES (@indexNo, @userName, @Title, @yearEst, @employeeCount, @Address_1, @Address_2, @Contacts, @TelNos, @FaxNos, @emailAddresses, @Website, @ManufacturingSubSectors_id, @ServicesSubSectors_id, @ExportDestinations_id, @ImportSources_id)"
OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT [indexNo], [userName], [Title], [yearEst], [employeeCount], [Address_1], [Address_2], [Contacts], [TelNos], [FaxNos], [emailAddresses], [Website], [ManufacturingSubSectors_id], [ServicesSubSectors_id], [ExportDestinations_id], [ImportSources_id] FROM [companyDetails] WHERE ([userName] = @userName)"
UpdateCommand="UPDATE [companyDetails] SET [yearEst] = @yearEst, [employeeCount] = @employeeCount, [Address_1] = @Address_1, [Address_2] = @Address_2, [Contacts] = @Contacts, [TelNos] = @TelNos, [FaxNos] = @FaxNos, [emailAddresses] = @emailAddresses, [Website] = @Website, [ManufacturingSubSectors_id] = @ManufacturingSubSectors_id, [ServicesSubSectors_id] = @ServicesSubSectors_id, [ExportDestinations_id] = @ExportDestinations_id, [ImportSources_id] = @ImportSources_id WHERE [indexNo] = @original_indexNo AND [userName] = @original_userName AND [Title] = @original_Title AND [yearEst] = @original_yearEst AND [employeeCount] = @original_employeeCount AND [Address_1] = @original_Address_1 AND [Address_2] = @original_Address_2 AND [Contacts] = @original_Contacts AND [TelNos] = @original_TelNos AND [FaxNos] = @original_FaxNos AND [emailAddresses] = @original_emailAddresses AND [Website] = @original_Website AND [ManufacturingSubSectors_id] = @original_ManufacturingSubSectors_id AND [ServicesSubSectors_id] = @original_ServicesSubSectors_id AND [ExportDestinations_id] = @original_ExportDestinations_id AND [ImportSources_id] = @original_ImportSources_id">
<DeleteParameters>
<asp:Parameter Name="original_indexNo" Type="Int32" />
<asp:Parameter Name="original_userName" Type="String" />
<asp:Parameter Name="original_Title" Type="String" />
<asp:Parameter Name="original_yearEst" Type="Int32" />
<asp:Parameter Name="original_employeeCount" Type="Int32" />
<asp:Parameter Name="original_Address_1" Type="String" />
<asp:Parameter Name="original_Address_2" Type="String" />
<asp:Parameter Name="original_Contacts" Type="String" />
<asp:Parameter Name="original_TelNos" Type="String" />
<asp:Parameter Name="original_FaxNos" Type="String" />
<asp:Parameter Name="original_emailAddresses" Type="String" />
<asp:Parameter Name="original_Website" Type="String" />
<asp:Parameter Name="original_ManufacturingSubSectors_id" Type="String" />
<asp:Parameter Name="original_ServicesSubSectors_id" Type="String" />
<asp:Parameter Name="original_ExportDestinations_id" Type="String" />
<asp:Parameter Name="original_ImportSources_id" Type="String" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="userName" Type="String" />
<asp:Parameter Name="Title" Type="String" />
<asp:Parameter Name="yearEst" Type="Int32" />
<asp:Parameter Name="employeeCount" Type="Int32" />
<asp:Parameter Name="Address_1" Type="String" />
<asp:Parameter Name="Address_2" Type="String" />
<asp:Parameter Name="Contacts" Type="String" />
<asp:Parameter Name="TelNos" Type="String" />
<asp:Parameter Name="FaxNos" Type="String" />
<asp:Parameter Name="emailAddresses" Type="String" />
<asp:Parameter Name="Website" Type="String" />
<asp:Parameter Name="ManufacturingSubSectors_id" Type="String" />
<asp:Parameter Name="ServicesSubSectors_id" Type="String" />
<asp:Parameter Name="ExportDestinations_id" Type="String" />
<asp:Parameter Name="ImportSources_id" Type="String" />
<asp:Parameter Name="original_indexNo" Type="Int32" />
<asp:Parameter Name="original_userName" Type="String" />
<asp:Parameter Name="original_Title" Type="String" />
<asp:Parameter Name="original_yearEst" Type="Int32" />
<asp:Parameter Name="original_employeeCount" Type="Int32" />
<asp:Parameter Name="original_Address_1" Type="String" />
<asp:Parameter Name="original_Address_2" Type="String" />
<asp:Parameter Name="original_Contacts" Type="String" />
<asp:Parameter Name="original_TelNos" Type="String" />
<asp:Parameter Name="original_FaxNos" Type="String" />
<asp:Parameter Name="original_emailAddresses" Type="String" />
<asp:Parameter Name="original_Website" Type="String" />
<asp:Parameter Name="original_ManufacturingSubSectors_id" Type="String" />
<asp:Parameter Name="original_ServicesSubSectors_id" Type="String" />
<asp:Parameter Name="original_ExportDestinations_id" Type="String" />
<asp:Parameter Name="original_ImportSources_id" Type="String" />
</UpdateParameters>
<SelectParameters>
<asp:ControlParameter ControlID="uId" Name="userName" PropertyName="Text" Type="String" />
</SelectParameters>
<InsertParameters>
<asp:Parameter Name="indexNo" Type="Int32" />
<asp:Parameter Name="userName" Type="String" />
<asp:Parameter Name="Title" Type="String" />
<asp:Parameter Name="yearEst" Type="Int32" />
<asp:Parameter Name="employeeCount" Type="Int32" />
<asp:Parameter Name="Address_1" Type="String" />
<asp:Parameter Name="Address_2" Type="String" />
<asp:Parameter Name="Contacts" Type="String" />
<asp:Parameter Name="TelNos" Type="String" />
<asp:Parameter Name="FaxNos" Type="String" />
<asp:Parameter Name="emailAddresses" Type="String" />
<asp:Parameter Name="Website" Type="String" />
<asp:Parameter Name="ManufacturingSubSectors_id" Type="String" />
<asp:Parameter Name="ServicesSubSectors_id" Type="String" />
<asp:Parameter Name="ExportDestinations_id" Type="String" />
<asp:Parameter Name="ImportSources_id" Type="String" />
</InsertParameters>
</asp:SqlDataSource>
</td>
<td style="width: 5px; height: 435px">
</td>
</tr>
<tr>
<td style="width: 2px">
</td>
<td style="width: 651px">
</td>
<td style="width: 5px">
</td>
</tr>
</table>
</form>
</body>
</html>
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Jan 3, 2006
Hi, i have a table in sqlexpress named Contacts:
ID (int) -primary key-
name (varchar(30))
lastname (varchar(30))
phone (varchar(15))
fax (varchar(15))
desc (text)
In my default.aspx page, i have a GridView that has the conecction to this table. The GridView has the Editing and Deleting checkbox enabled but my problem is that i can't edit or delete any row when the page is running and the massage is this: "The data types text and nvarchar are incompatible in the equal to operator"
It would have to work, but i don't know what happen, Please, any help!
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Feb 18, 2008
Hello,
I am trying to write a small dynamic sql statement and I am receiving the following error when working with a bit data type.
The data types varchar and bit are incompatible in the add operator
Here is what I have:
Code Snippet
create proc [dbo].[usp_SetupDatabaseUser]
(
@ProcAccess bit = 0
)
as
begin
set nocount on
declare @sql nvarchar(MAX)
-- Check for user existence
select @sql = 'if (' + @ProcAccess + ' = 1)
begin
print ''Hello World''
end'
exec @sql
end
After I execute, that is why I receive the error. Any advice would be appreciated!
Thanks,
Flea#
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Mar 21, 2013
There are a few databases I work with that have been designed where varchar columns are used to store what actually displays on the front end as Ints, Decimals, Varchars, Datetimes, checkboxes.
I often have to write integrations with these databases bringing data in and prefer to validate the data whilst loading from the staging tables.
I have seen allsorts of values being passed into the staging tables that will load into the target database because the columns are all varchars but the values don't display on the front end because the app actively filters bad values out.
What I would like to do is for my validation scripts to warn up front of potentially invalid datatypes. My problem is that forexample the ISNUMERIC() function return 1 for the value ',1234' but a CONVERT(NUMERIC, ',1234') or CAST(',1234' AS NUMERIC) will fail with a "Error converting data type varchar to numeric).
I've been trying to locate a set of reliable datatype testing functions that will reliably determine if a varchar can be converted to a given data type or not.
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Feb 6, 2014
I am trying to solve an issue in SQL but am getting this error
The data types xml and varchar are incompatible in the equal to operator.
My Query is fairly long. How I can resolve this?
UPDATE Promotions
SET PromotionDiscountData = '<ArrayOfPromotionRuleBase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><PromotionRuleBase xsi:type="ProductIdPromotionRule"><ProductIds><int>13,16,15215,15223,15225,15227,15231,15261,15266,15267,15272,15274,15276,15277,15288,15289,
15290,15292,15293,15297,15299,15316,15329,15336,53787,53788,53789,55872,55873,55874</int></ProductIds>
[Code] ....
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Feb 25, 2006
Hi,
If I make a select query on my table, this error appears:
"The data types text and varchar are incompatible in the equal to operator"
In my table , I have 4 fields with "text" datatype.
My query is like : "Select * from table where field1='test'"
It's seems to be simple, but it doesn't work!!!
Thanks
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Aug 28, 2007
i have used nvarchar as my datatype in sql server 2000 now
i have decided to change to varchar as i can increase the character length from 4000 to 8000
Do I Lose data if i change the datatype.
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Jul 10, 2003
I have a table using nvarchar(for what ever reason which beyond me why its a nvarchar...) that I would like to change to a varchar. There is no unicode in the fields so I don't have to worry about but I don't want to lose any text data. Will coverting the data type lose data?
Thanks
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May 16, 2006
So I have an existing table that looks like:
ID BIGINT
VAL VARCHAR(128)
I am converting this table to something that will be multi language compliant. My question is, I know that NVARCHAR's take double the space of a VARCHAR. Do I actually need to double the length of the VAL field to store the same amount of data or does the DB handle that?
Basically I want to store a 128 character NVARCHAR.. do I need to set my table up like this:
ID BIGINT
VAL NVARCHAR(256)
or
ID BIGINT
VAL NVARCHAR(128)
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Feb 26, 2007
Hi,I am new to MS SQL. When I create a column in a table, when shall Iuse nvarchar or varchar? Please help.Thanks,Mike
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Dec 18, 2006
from the definition, i know that "n" means uni-code. but what is the exact advantage of having nchar or nvarchar over char or varchar?
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Jun 19, 2004
Hello again everyone....
I have another question for everyone....
I am currently cleaning up my database to get its total size down and am not sure how nvarchar and varchar work exactly.
When defining the length of a varchar or nvarchar in enterprise manager, will that effect the size of the entry (as far as data size) no matter what the length of the entry? In other words, will there be a difference in Data Size for an entry with the length of 4 characters with a definition of varchar(4) versus an entry with the length of 4 characters with a definition of varchar(50).
****If there is no difference, is there any reason in trying to best guess the size to give nvarchar or varchar columns? It would seem easier to just define the lengths of columns which need variable lengths to 200 or 400 just to save time in not trying to best guess what the size might be...*****
Thanks ahead for any help...
-Alec
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Aug 4, 2006
Hi,
Can someone please explain to me how the datapages in Microsoft SQL Server 2000 works. The pages are supposed to be 8K, that is 8192 bytes of which only 8060 are accessible for data storage (due to overhead).
Now, I currently have a table containing 8 fields. Two of these fields are varchar and should be converted to nvarchar. One of the varchar fields is limited to 255 characters and the other to 4000 characters. When I convert the 255 characters field to nvarchar it works just fine, but when I want to convert the 4000 characters field I get an error from MS SQL saying that it gets to big. Is the error only for the 4000 characters field (which growths to 8000 bytes when using nvarchar instead of varchar) or must the whole table fit into one datapage?
Could a blob maybe solve my problem, or will I face new problems when storing unicode characters in a blob?
Thanks in advance
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Jan 14, 2006
I have a table with a Varchar field that will contain encrypted data. Since each byte can have a value from 0 through 255, can I use Varchar or should I change the field to NVarchar? The reason I ask is that during testing, the Varchar field sometimes is truncated, supposed to be 16 bytes but ends up as 5 or 6 or something less than 16.
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Mar 9, 2007
Hi,I have a pretty straightforward question to do with variable length fields I hope someone can help me with:When using varchar (or nvarchar), is there any point in specifying a smaller length than the maximum? Does it save space or improve performance at all?ThanksRedit: I suppose the max rowsize is an issue. any others?
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Feb 17, 2006
What is the difference between the nvarchar and varchar datatypes? Which should be used?
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Apr 10, 2006
What is the diferent between varchar an nvarchar?
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May 22, 2006
hi
could any one help me in differentiating between varchar and nvarchar
Thanks in advance
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Oct 10, 2007
I have table with a field defined as nvarchar. I want to change it to varchar. I have a stored procedure which defines the parameter @strCall_desc as nvarchar(4000). Are there going to be ay problems with running this sp if I just change the field type as described.
TIA
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Jul 20, 2005
HiThe maximum length of a nvarchar could be 4000 characters while that ofvarchar could be 8000.We are trying to use unicode which would require that the datatype forone our fields be converted from varchar to nvarchar. But looks likethis would result in loss of existing data.Is there a way to do this without loss of data?Many thanks.*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Mar 14, 2006
I am using SQL Express
I have a very simple function to retreive the maximum value (MemberID) from a member table. The memberID column is in "nvarchar(8)" type.
The following shows the function:
ALTER FUNCTION dbo.GetLastMemberID()
RETURNS nvarchar(8)
AS
BEGIN
RETURN (SELECT ISNULL(MAX(MemberID),'IM000000') FROM MemberInfo)
END
When i run the function, only the first 4 character (say 'IM00') is returned.
If I change the "RETURNS nvarchar(8)" to either "RETURNS nvarchar(16)" or "RETURNS varchar(8)", whole column (8 characters) is returned.
My question: should I use nvarchar(16) or varchar(8) in the function in this case?
Thanks
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Apr 11, 2006
Please I know this is fustrating but I really need help with this issue:
I am getting data conversion error when I tried to load data from one SQl table to another SQL table using SSIS.
The source table has a column with data type nvarchar(max). Also the destination table has the same data type nvarchar(max) but I keep getting conversion error when I use SCD transformation.
Error: " Input column "des" (116) has a long object data type of DT_TEXT, DT_NTEXT or DT_IMAGE which is not supported"
I am fine when I use OLEDB destination but I want to do an incremental load.
Is there a quick fix for this?
Thanks
Omon
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Jun 26, 2007
what is the difference between nvarchar and varchar
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Jun 20, 2007
I have looked at several explinations and I understand the difference between unicode and non-unicode.
I get that the basic idea around storage is "double", 2 bytes instead of 1.
My question is, does the 2 byte instead of 1 byte rule apply even if I am storing a char that doesn't need the full to bytes.
for arguments sake I have a table called "UnicodeTable" and one column called "Letter".
If I store the letter "A" on the first row of the "UnicodeTable" does the size of my database increase by 2 bytes?
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May 4, 2004
I have an existing application that relies on a SQL Server database.
I want to switch all varchar fields to nvarchar so it can handle multiple languages.
The database has ~25 tables, many of which have varchar fields. I want to convert them all to nvarchar.
The database has ~150 stored procedures, many of which have varchar fields. I want to convert them all to nvarchar.
Are there any tools out there that would let me convert the tables of my choosing, and the stored procedures of my choosing, so that any 'varchar' mentions are changed to 'nvarchar' ? I've only used SQL Query Analyzer to write queries and use MS Access (and some SQL Enterprise Manager) to make the tables and relationships.
Thanks,
-Bret
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Aug 20, 2001
We have few stored procedures that use nvarchar datatype, this was not issue on SQL server 7.0 but in 2000 becomes a big issue.
For example query that runs for 3 minutes in SQL server 2000 by replacing NVARCHAR to VARCHAR the same query runs for 2 seconds.
The biggest challenge that I have deals with tables and user-defined datatypes of NVARCHAR that has been bounded to the table.
How can I alter those without data corruption?
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Apr 19, 2004
Hi,
Which of the above data type (alongwith size) should be used for storing things like Customer Name, Company name etc . ???
Also, what really is the benefit of one over the over :confused:
Thanks
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