I'm having a hard time getting one of my tables to use a non clustered index that I have on a DateTime column.
A sample version of the table is something like this
CREATE TABLE Appointments
(
ID INT NOT NULL,
AppointmentDate DateTime NOT NULL
)
with a clustered primary key on ID and a nonclustered key on AppointmentDate.
This production table has over 1million rows and the problem I have is this:
If I do a SELECT * FROM Appointments where AppointmentDate >= '20060701' AND AppointmentDate < '20060702' the Non clustered index on the AppointmentDate column works fine. i.e. I'm returning all appointments for the 1st of July.
Now if I run the exact same query using datetime parameters, a Clustered index scan is performed instead of an index seek.
DECLARE @AppDate DateTime
SET @AppDate = '20060701'
SELECT * FROM Appointments WHERE AppointmentDate >= @AppDate and AppointmentDate < DATEADD(day, 1, @AppDate)
I have 5 million rows of table, and going to create Non Clustered Index for Datetime values column. Creating Non clustered Index on Datetime value column will affect performance or not.
Hi, I'm inserting a datetime values into sql server 2000 from c#
SQL server table details Table nameate_test columnname datatype No int date_t DateTime
C# coding SqlConnection connectionToDatabase = new SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=SSPI"); connectionToDatabase.Open(); DataTable dt1 = new DataTable(); dt1.Columns.Add("no",typeof(System.Int16)); dt1.Columns.Add("date_t", typeof(System.DateTime)); DataRow dr = dt1.NewRow(); dr["no"] = 1; dr["date_t"] = DateTime.Now; dt1.Rows.Add(dr); for(int i=0;i<dt1.Rows.Count;i++) { string str=dt1.Rows["no"].ToString(); DateTime dt=(DateTime)dt1.Rows["date_t"]; string insertQuery = "insert into date_test values(" + str + ",'" + dt + "')"; SqlCommand cmd = new SqlCommand(insertQuery, connectionToDatabase); cmd.ExecuteNonQuery(); MessageBox.Show("saved"); } When I run the above code, data is inserted into the table The value in the date_t column is 2007-07-09 22:10:11 000.The milliseconds value is always 000 only.I need the millisecond values also in date_t column. Is there any conversion needed for millisecond values?
Web Base application or PDA devices use to initiate the order from all over the country. The issue is this table is not Partioned but good HP with 30 GB RAM is installed. this is main table that receive 18,0000 hits or more. All brokers and users are using this table to see the status of their order.
The always search by OrderID, or ClientID or order_SubNo, or enter any two like (Client_ID+Order_Sub_ID) or any combination.
Query takes to much time when ever server receive more querys. some orther indexes are also created on the same table like (OrderDate, OrdCreate Date and Status)
My Question are:-
Q1. IF Person "A" query to DB on Client_ID, then what Index will use ? (If any one do Query on any two combination like Client_ID+Order_ID, So what index will be uesd.? How does MS-SQL SERVER deal with these kind of issues.?
Q2. If i create 3 more indexes on ClientID, ORderID and OrdersubID. will this improve the performance of query.if person "A" search record on orderNo so what index will be used. (Mind it their would be 3 seprate indexes for Each PK columns) and composite-Clustered index is also available.?
Q3. I want to check what indexes has been used? on what search?
Q4. How can i check what table was populated when, or last date of update (DML)?
My Limitation is i Dont Create a Partioned table. I dont have permission to do it.
In Teradata we had more than 4 tb record of CRM data with no issue. i am not new baby in db line but not expert in sql server 2003.
I've got a table with the following fields and data types
ProjIDint StatusDatedatetime ProjStatusvarchar(1)
I want to put a unique index on the fields above, each ProjID can only have one ProjStatus on a given StatusDate (dd/mm/yyyy) , but because of the milliseconds in the date time it's not happening. Any suggestions on how I can get around this.
I have a database which is centered around two date tables (approx. 5.5 million records each). We are finally making the big leap from SQL Server 2005 to 2012. The data is currently stored as datetime, and we are hoping to take advantage of the new date datatype, since the time component is not needed.
The first table has 13 different date columns. In testing on the 2012 server I have changed 3 columns so far, and have seen that changing the datatype to date is actually increasing the Index size and not affecting the data size. Only 3 of the columns are associated with indexes, and modifying a non-indexed column still increased the index size. I am running the Disk Usage by Table report to view the sizes.
Hi,Would like to know the performance differenece between Multi-columnIndex vs Single Column Indexes. Let's say I have a table with col1,col2, col3 along with a primary key column and non-indexed columns.In queries, I will use col1, col2, and col3 together and some timesjust one or two of these three columns. My questions is, should Icreate one index contains col1, col2, and col3, or create 3 seperatedcolumns. I.e. each column has its own index. Any performancedifference?Thanks a lot.
I got this error report "The string was not recognized as a valid DateTime. There is a unknown word starting at index 0." at this line of code in BOLD.
For some reasons the datetime format in the database has the (US datetime format - 05/02/2008 06:40 instead of United Kingdom (UK date time format - 02/05/2008 06:40), as I had planned. I have tried to reformat the database and VB date format and all to no success.Could this be the root of my problems?
Code Snippet Public Class Form1
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If con.State = ConnectionState.Open Then con.Close() con.Open() cmd = New SqlCommand("SELECT REM_NOTE, REM_DATE FROM dbo.MY_CONTACTS", con)
Dim sdr As SqlDataReader = cmd.ExecuteReader While sdr.HasRows = True
Dim newAlert As New Alert(Reminder_data_reader("REM_NOTE").ToString(), DateTime.Parse(Reminder_data_reader("REM_DATE").ToString())) Me.collectionOfAlerts.Add(newAlert)
Hello everyone, I am new to ERWIN and I need helps from the experts outthere.We are using ERWin 4.1.2771 and have reversed engineered some MS SQLServer 2000 databases.The problem we are having is that we have a FK on a column to a tablewhere the PK of the referencing table is on another column (such as anidentity column). We have a unique index on the column in the PK tableand SQL Server allows you to build a FK reference even though thecolumn is not defined as the PK.Does anyone know how to create this type of FK within Erwin?Thank You
i cannot seem to get rid of this error. My page works in other functions that have the same syntax and format. just this one doesnt. i tried changing the format but still the same thing. SQL DB is DateTime. Any Suggestions?
Function UpdateException(ByVal qID As String, ByVal exception_Status As String, ByVal completed As String, byval notes as string, byVal Username as string) As Integer dim strDate as date = datetime.now() dim strdate1 as string = strDate.tostring("MM-dd-yy") Dim connectionString As String = "server='servername'; trusted_connection=true; Database='CPD_Reports'" Dim sqlConnection As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(connectionString)
Dim queryString As String = "UPDATE [Master_CPD_Reports] SET [Exception_Status]=@Exception_Status, [Completed]"& _ "= @Completed, [Completion_Date]= @Completion_Date, [Username]= @Username WHERE ([Master_CPD_Reports].[QID] = @QID)" Dim sqlCommand As System.Data.SqlClient.SqlCommand = New System.Data.SqlClient.SqlCommand(queryString, sqlConnection)
sqlCommand.Parameters.Add("@QID", System.Data.SqlDbType.VarChar).Value = qID sqlCommand.Parameters.Add("@Exception_Status", System.Data.SqlDbType.VarChar).Value = exception_Status sqlCommand.Parameters.Add("@Completed", System.Data.SqlDbType.VarChar).Value = completed sqlCommand.Parameters.Add("@Completion_Date", System.Data.SqlDbType.varchar).Value = strDate1 sqlCommand.Parameters.Add("@Username", System.Data.SqlDbType.DateTime).Value = UserName dim NotesUpdate as string = "INSERT INTO [CPD_Notes] ([qID], [Notes], [Notes_Date], [Username]) VALUES (@qID, @notes, @Date, @UserName1)" Dim sqlCommand1 As System.Data.SqlClient.SqlCommand = New System.Data.SqlClient.SqlCommand(NotesUpdate, sqlConnection) sqlcommand1.parameters.add("@qID", system.data.sqldbtype.varchar).value = qID sqlcommand1.parameters.add("@Notes", system.data.sqldbtype.varchar).value = notes sqlcommand1.parameters.add("@UserName1", system.data.sqldbtype.varchar).value = Username sqlcommand1.parameters.add("@Date", system.data.sqldbtype.datetime).value = DateTime.now() Dim rowsAffected As Integer = 0 trace.warn(strdate1)
sqlConnection.Open Try rowsAffected = sqlCommand.ExecuteNonQuery Finally End Try
MSSql2000: According to docs: "Columns of type bit cannot have indexes on them"
Its impossible to define index on bit column using EM but ‘create index …’ command in QA is working and the index is created. I understand why not to create index like this but … its valid or invalid operation to create index on BIT column ?
tblBranch BranchID | BranchName -------------------------- 9 | Kota Raja 10 | Kota Alam 11 | Kota Lama 12 | Kota Tua 13 | Kota Hantu *BranchID is a primary key
Which column need to put an index? Can anyone show me the best way?
Is there any advantage to doing this:ALTER TABLE testtable ADDCONSTRAINT PK_sysUserPRIMARY KEY NONCLUSTERED (UserID)WITH FILLFACTOR = 100,CONSTRAINT IX_sysUserUNIQUE NONCLUSTERED (UserID)WITH FILLFACTOR = 100GOover just having the primary key? Does having both an index and aprimary key add anything?thankschris
I have a column which Data Type is DateTime the value is looks like 2008-01-18 16:40:39.560if I want to group by this column only compare with yyyy/mm/dd , don't care the TimeHow to write a Sql Query to fit this request?the values in Columns like below2008-01-18 16:40:39.5602008-01-18 16:40:39.5602008-01-18 16:40:39.5602008-01-18 16:40:39.5602008-01-18 17:10:02.8572008-01-18 17:10:37.3732008-01-18 17:10:37.3732008-01-18 17:11:57.1872008-01-18 17:12:22.8102008-01-18 17:13:01.4502008-01-18 17:13:37.1532008-01-18 17:13:52.4502008-01-18 17:14:10.6402008-01-18 17:14:24.6532008-01-18 17:14:41.1532008-01-18 17:15:09.3572008-01-21 14:55:18.560 thank you for your posting .
Hi All,I faced this strange problem with sql server. I have datetime column and storing value from asp.net. If the user doesnt enter any date, then we dont want any value to be stored in the database. But when we checked SQL Server, it default takes this value "01/01/1900". When users clicks on edit button, this value is fetched from database and stored in front end. I dont want this value to be stored in database if i didnt provide value. But in 1 particular page, there are 5 different date columns. I am not sure about how to go ahead. I tried the following way, but again ended up with same problem.insert into tablename.......values (...., txtFromDate.text, txtToDate.text,....). Since value is not there, '' is sent to database and above said value is stored. i want NULL to be stored in teh database when user didnt specify any value.i didnt encounter this problem in Oracle.appreciate your reply.
hi, i was wondering how to set default value in the datetime column of the database so that it will enter current date and time if one is not provided when a row is populated. is there a store procedure to do this? or built-in function? mp
I've got have a populated table and I want to convert a datetime column so it lists the date only (without the time component) I tried to run this as a script, but returns an error:
update <table> where <column>=convert(datetime,convert(char10),<column>,101))
When I run only this part, it does strip the date of the time component but it becomes a string, and I need this field stored as a datetime field:
I'm trying to update a datetime column from another datetime column. However, I just want the date transferred to the new column without the time. Any ideas? Thanks for your help.
I have column that hold datetime , i want to split the column into many columns ex: column --> 01/01/2007 00:00:00 i want tp split to day month year hour minute second
In SQL server I have the column doTableDate set a Datetime.I need extract all rows in on date range and I think use to syntax `Between And` If try this version of query I have in output 889 rows all with date 2014-01-03... but I have other records with date 2014-01-04 in column doTableData...
SELECT * FROM doTable WHERE doTableDate BETWEEN CONVERT ( datetime,
hi ppls.. we have sql server 2000 EM. we received daily xml files and we insert into our database.there is one column Date_T having data type datetime.till date we recieved this records from xml as '03/23/2004 12:23:34:956' but due to some duplicate isssue we now want to modified this column to recieve as milliseconds like '03/23/2004 12:23:34:956232' now my point is wheather sql server handle this kind of milliseconds..please help me out as early as possible..
Hello. In SQL server 2000 (or 2005) I have a need to query a table for rows with the max date value in a datetime column. Currently I coded the following to give me a specific date in the column: ...where R.start_time >= '02/15/2008' and R.start_time < DateAdd(day, 1, '02/15/2008')
This gives me the rows with the exact date of 02/15/2008. So, if I don't want to hard-code the date or pass it as a parameter how can I always get the maximum date back from the query?
HOW DO I CONVERT DATA AND TIME COLUMNS TO DATETIME COLUMN. I HAVE A REQUIREMENT TO FIND OUT THE MAX AND MIN OF DATE AND TIME COLUMNS WHICH ARE TWO SEPARATE COLUMNS ALL TOGETHER. I HAVE DATA IN COLUMN1 AND TIME IN COLUMN2 HAVE TO CONCATENATE BOTH THE COLUMNS TO GET THE MAX AND MIN TO DATE.
EXAMPLE I TRIED TO DO : SELECT MIN(convert(datetime, VH_DATETIME,121), MAX(convert(datetime,VH_DATETIME, 121)) FROM (SELECT TOP 10 INPUT_DATE+INPUT_TIME AS VH_DATETIME FROM ADMINDB.dbo.SSIS_VISIT_HIST) VH
Hi, I have a table with 3 columns ( Id int, theValue float , aDate datetime). I want to select the number of rows (count) for which the interval of aDate is less than 7 seconds. Is there a way to achieve that in a single query.
PS: This query will be perform on a dataset, that means that I can't use cursor.
This is for SQL 2000 (SP 2) using Enterprise Manager. I have a table with a unique index comprised of several int fields. The index needs to include an additional bit field that is part of the table. But when I go to modify the index, the bit field name doesn't appear in the Column Name list. Can anyone shed any light on the problem? Thanks.
