I have a textbox1 control where a zip code is entered. What is the most efficient way in C# code behind to see if that zip code exists in tblZipCode? I only need to know if it is there, do not need to know how many occurances.
View 7 RepliesHi,
This is on Sybase but I'm guessing that the same situation would happen on SQL Server. (Please confirm if you know).
I'm looking at these new databases and I'm seeing code similar to this all over the place:
if not exists (select 1 from dbo.t1 where f1 = @p1)
begin
select @errno = @errno | 1
end
There's a unique clustered in dex on t1.f1.
The execution plan shows this for this statement:
FROM TABLE
dbo.t1
EXISTS TABLE : nested iteration.
Table Scan.
Forward scan.
Positioning at start of table.
It's not using my index!!!!!
It seems to be the case with EXISTS statements. Can anybody confirm?
I also hinted to use the index but it still didn't use it.
If the existence check really doesn't use the index, what's a good code alternative to this check?
I did this and it's working great but I wonder if there's a better alternative. I don't really like doing the SET ROWCOUNT 1 and then SET ROWCOUNT 0 thing. SELECT TOP 1 won't work on Sybase, :-(.
SET ROWCOUNT 1
SELECT @cnt = (SELECT 1 FROM dbo.t1 (index ix01)
WHERE f1 = @p1
)
SET ROWCOUNT 0
Appreciate your help.
Previously same records exists in table having primary key and table having foreign key . we have faced 7 records were lost from primary key table but same record exists in foreign key table.
View 3 Replies View RelatedI need to find out if a Transaction ID exists in Table A that does not exist in Table B. If that is the case, then I need to insert into Table B all of the Transaction IDs and Descriptions that are not already in. Seems to me this would involve If Not Exists and then an insert into Table B. This would work easily if there were only one row. What is the best way to handle it if there are a bunch of rows? Should there be some type of looping?
View 12 Replies View RelatedHI,
having a problem with a data loading from 2005 to 2000. Im using export & import wizard. But the problem comes when the user drops a table on 2005. Anyway to check if table exista then use the E&I to load the data.
I cant use the BCP as xp_shellcmd is disable.
Hi all,I am in the process of creating a page that checks to see if a particular user exists in the database and if it does then send to welcome.aspx if not then accessdenied.aspx. The userid is requested from the query string.I have done some research and cannot find anything directly related, I have tried to add bits of code into what i think is the right place but I dont think what i am doing is correct. Can someone help and show me where my code is going wrong? Also is there a better/more efficient way to do what I am doing?Thanks in advance. default.aspx.csusing System;using System.Data;using System.Data.SqlClient;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class _Default : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { string UserID = Request.QueryString["uid"]; //string TransferPage; if (UserID != null) { //initiate connection to db SqlConnection objConnect = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString); string sql = "SELECT COUNT(*) FROM members WHERE UserID = '" + UserID + "'"; SqlCommand query = new SqlCommand(cmd, test); int count = (int)query.ExecuteScalar(); int aantal = -1; // some default value if can't insert record if (count == 0) // no existing record for username { Server.Transfer("accessdenied.aspx"); } else { Session["UID"] = UserID; Server.Transfer("welcome.aspx"); } } }}
View 7 Replies View Relatedi am using vb.net and ms sql server 2005 express.....what is the syntax for dropping a table if existsi have used this but it says incorrect syntax near if Dim cmda As New SqlCommand("drop table " + test + " if exists", New SqlConnection(strdb)) cmda.Connection.Open() cmda.ExecuteNonQuery() cmda.Connection.Close()any solutions???? plz only answer in vb.net and sql server express
View 8 Replies View RelatedWhat is the best way to programmatically determine if a temp table exists? In 6.5, I would use
IF EXISTS(SELECT * from tempdb..sysobjects where id = object_id('tempdb..#MyTable') and type = 'U')
But now that it is strongly discouraged to code against system tables, how could I re-write this statement?
The proper way to check the existence of a table would be:
IF OBJECTPROPERTY(object_id('tablename'), 'IsTable') = 1
However, to get this to run for a temp table, I think you'd have to change the database context to tempdb and then back to your database. That doesn't seem efficient.
I could use
IF object_id('tempdb..#MyTable') IS NOT NULL
But that's not guarenteeing that it's a table, right?
Any ideas?
How do I find out if a temporary table named '##test' exists? I have a stored
procedure that creates this table and if it exists another stored procedure
should do one thing, if it does not exist I want the SP to do something else.
Any help as to how I can determine if this table exists at the current time
would be greatly appreciated.
Thanks in advance for you help,
Jon
I need a snippet of code that will determine wether or not a table exists in a database...
thanx
in mysql i can drop a table or db if it currently exists using
drop table if exists [table1] or
drop database if exists [db1]
is there an equalivant in ms sql
thanks
Hi,
This my first time using the link server to read the files directly from within SQL2005, so issues the following link:-
EXEC sp_addlinkedserver
@server = N'MYVFPSERVER', -- Your linked server name here
@srvproduct=N'Visual FoxPro 9', -- can be anything
@provider=N'VFPOLEDB',
@datasrc=N'"C:PROGRAM FILESMICROSOFT VISUAL FOXPRO 9Samplesdata estdata.dbc"'
After that i can open query and do the import issues, but how can check if the table exists before issues the query.
Best regards
Hi,I am trying to create a script that deletes transaction tables and leavesmaster data like customer, vendors, inventory items, etc. How can I useTRUNCATE TABLE with an Exists? My problem is I have 200+ tables, if Isimply use a list like:truncate table01truncate table02truncate table03....I get errors if the table does not exist and have to manually run thetruncate statements. Some tables may not exist if that part of the app isnever used. I'm trying to make a list of all tables that could existwithout it erroring out 50+ times.Thanks in advance.
View 2 Replies View RelatedWhat’s the easiest way to check if a single value exists in a table column? I’m building a simple login page, and I want to get the username and check if it exists in my Users table. Here’s my SQL: SELECT UserID FROM UsersWHERE UserID = "admin" Could someone give me code to check for “admin” in my UserID column? Here’s some code I tried, using my SqlDataSource, but it returns an error “Could not load type 'System.Data.OleDb'” protected void Button1_Click(object sender, EventArgs e) { // Retreive the results from the SqlDataSource as a DataReader OleDbDataReader reader = (OleDbDataReader) SqlDataSource1.Select(DataSourceSelectArguments.Empty); // Read in the value if (reader.Read()) { } // Close the reader reader.Close(); } I don’t have to use the SqlDataSource, but originally thought it might be easier. I know how to use SqlDataSource to fill a whole GridView but this is different.
View 2 Replies View RelatedBasically, i am still relatively new to ASP.net and SQL. And i have the following query.
I have a skills table to which the user enters their skills using the following fields: Skillcatagory, SKill, Current Level, Target Level, target date and comments and the serial of the user.
I need to check via our staff table, which people have had a skill entered for them. And then produce a report on who has not had a skill entered for them.
This table has a serial of the user column aswell which is unique.
If there is more information that i can give you to assist me, please ask me.
You help would be greatly appreciated.
I need to do some processing but only if a specific table 'table1' exists in the SQL Server database. How can I check if this 'table1' exists using either ADO.Net code or SQL Server query?
View 12 Replies View RelatedI've got two tables, one containing a list of company names(approx 10,000 records), the other containing a list of company employees (approx 30,000 records) joined by the CompanyID column.
I have a third table (approx 700 records) containing new employees to be added to the employee table. Each record in this table has the employees details plus the name of their company.
I want to write a query that will check each row in the third table to see if
a) the employee exists in the Employees table
b) the company exists in the Companies table and
c) the employee is listed under the correct company
The query should also handle any combination of the above. So if the company doesn't exist but the employee does, create the company on the companies table and update the appropriate record on the employees table with the new CompanyID etc. etc.
Oh, forgot to mention. The company names in the third table won't be exactly the same as the ones in the Company table so will need to use CharIndex.
Anybody got any ideas?
Hi
Can anybody tell me how can I find whether a column exists in my table or not???
Piyush
I have 2 test tables one for stock and one for prices.
I need to select all the rows from Stock but also the price on the stock but the price table doesn't always have the date, so I can not do stock date = price date.
What it needs to do is if the Stoc Date isn't in the price table use the price before... this would also have to be able to run on my rows...
-- Create Test Table (not sure if dates USA or UK format on your machine...
CREATE TABLE [dbo].[TheStockLedger](
[EntryID] [int] NULL,
[TheDate] [datetime] NULL,
[StoreCode] [nvarchar](50) NULL,
[Item] [nvarchar](50) NULL,
[ColorCode] [nvarchar](50) NULL,
[code]....
I need to drop a table if exist ?? how can i do that ??
thanx !
Hi,
How can I verify if a temporary table called #X, for example, exists in database?
Thanks.
So I declared this table data type , cool.. It works
CREATE TYPE BP_Data_XXX
as table
(
XXX_VALUE_NUMERIC numeric(19,2),
bp_type VARCHAR(4),
Dt datetime,
ID int IDENTITY(1,1),
MBP numeric(19,2),
CONCEPT_ID VARCHAR(10)
)
Now my question is later how do we check whether this type exists. The following does not work.
if( object_id('BP_Data_XXX') IS NOT NULL )
print 'IT is there '
Hi there,
I want to create an SQL Function that checks if a table exists and returns true or false. I will pass this function a paramter (say @COMPANYID) e.g.
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tblmyTableName_' + @COMPANYID) and OBJECTPROPERTY(id, N'IsUserTable') = 1)
how would I write this so the query is dynamically executed and I can get a value of true or false back?
I need to write a stored procedure to verify that a table exists andalso that the user executing the stored procedure has access to thespecified table.Any user can call this publicly available procedure and pass a databasename, an owner name and a table name as parameters. The procedurereturns success if the table exists and the user has access to it, orfails if he doesn't. Here's a simplified version of what I have, butI'm wondering if there's a better way. Thanks.create procedure dumb asbegindeclare @myError int,@mytable varchar(128),@myquery varchar(128)select @mytable = '[Northwind].[dbo].[sysobjects2]'select @myquery = 'DECLARE @x int SELECT @x = count(1) from ' +@mytable + ' where 1 = 2'exec (@myquery)select @myError = @@ERRORif @myError != 0BEGINRAISERROR ('ERROR: The specified table %s cannot be accessed.', 10, 1,@mytable)RETURN 1endendgo
View 10 Replies View RelatedHelloI am using a temp table called ##temp in an SProc but often get themessage that the table already exists. Could this be because the SProcis being run by more than 2 webpages at the same time?Or is it because the sProc has an error and is not getting to the droptable line?I have tried adding a line to test if the object exists and to drop thetable before I create it. If I drop it will it affect another instanceof the sProc that is using the same table name?If so is there a way around this?Many thanksNigel
View 2 Replies View RelatedHello,Using Enterprise Manager, I deleted from my database the only tablethat contained records (Right-Click on Table, Choose "Delete Table").My expectation was that the LARGE .mdf file would be reduced to minimalsize (at least as small as the Northwind MDF). However, it's still 4+Gig in size!! (Northwind is 2.62 MB). This is a problem, bc I deletedthe table in order to recapture hard drive space.NOTE: I already tried using Shrink Database in EM. This significantlyreduced the size of the .mdf file from its original (i.e. pre-delete)size of 38 Gig to present size of 4 Gig.What can I do to further reduce the size of the MDF file?Thank you.
View 1 Replies View RelatedHello.
How can I check if a temporary table exists in the current context?
With normal tables I'd do a
EXISTS ( SELECT name FROM sysobjects
WHERE name='myTableName' AND type='U')
However, I can't do that with a temporary table. I'd have to go look at the sysobjects table in the tempdb database.
The problem is that for temporary tables, a suffix is added to the name to make it unique for each scope. I can't change the WHERE clause to name LIKE 'myTableName%' because this would return true if a temporary table with the same name exists in a different scope.
Any ideas?
Carlos
I apologize if this has been asked, and answered, before. I wasn't able to find relevant posts on the forum. A Google search pointed me to a couple of pages that offered this simple recipe:
if object_id('#temp') is not null
print 'table exists';
(I have also tried 'tempdb.#temp', and 'object_id(..,'U'))
Unfortunately, this doesn't work: the condition evaluates to 'false'. #temp is alive and well: strying to 'select .. into' it raises error
> There is already an object named '#temp' in the database.
Thanks a lot!
I'm trying to check if a certain table exists in a given database on a SQL 2005 Server.
I've tried numerous times without any result.
can anyone point me in the right direction?
I need a SQL or TSQL command (not a stored procedure) that will determine if a table exists (TBL_PARAMETERS). The command needs to return a 1 if the table exists or 0 if it dose not exist.
Thanks!
Sean
I am getting info from one table, CalibrationReview, that is not inanother table, tblEquipments.
SELECT EquipmentNumber, Model, SerialNumber, Make, CalLabName, CalDateFROM CalibrationReviewWHERE NOT EXISTS (SELECT AssignedID FROM tblEquipments WHERE AssignedID = CalibrationReview.EquipmentNumber)
Now, I need to take these rows and INSERT them into tblEquipments,but with some conditions.
tblEquipments has some contraints, so, the following needs to be done:
Using dbo.CalibrationReview.EquipmentNumber, get CalibrationMaster.TestTechnology where dbo.CalibrationReview.EquipmentNumber = dbo.CalibrationMaster.EquipmentID
Then take CalibrationMaster.TestTechnology and read tblTestTechnology.testTechnology and get tblTestTechnology.id
So,
tblEquipments.testTechnology = tblTestTechnology.id OR 1 if not foundWHERE dbo.CalibrationReview.EquipmentNumber = dbo.CalibrationMaster.EquipmentID and CalibrationMaster.TestTechnology = tblTestTechnology.testTechnology
And similar for CalibrationReview.CalLabName.
tblEquipments.calLab = tblLabs.ID where tblLabs.LabName = CalibrationReview.CalLabName
I hope this is clear as I can write this in code behind, but it'smuch better using sql simply because it's faster and only needs tobe run once.
Inheriting databases and combining all of them to develop a large.Net management system is fun, huh?
Thanks for any input,
Zath
Say you have a fact table with a few columns that all reference the same key column in a dimension table, you want to write a view to return the information for those keys?
USE MyTestDB;
GO
SET NOCOUNT ON;
IF OBJECT_ID ('dbo.FactTemp' ,'U') IS NOT NULL
DROP TABLE dbo.FactTemp;
[Code] ....
I'm using very small data at the moment, and the query plan and statistics don't really say which way.
i need to check that the column exist in the table if yes the update/insert value in the column else i need to add the new column like new browser name in the table.
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