Should I Add Lock Statements To My Database Write Querys
Jun 5, 2008
Hello,Could some clarify for me? I’ve been told that I should add lock statements to my database write querys (update, delete, insert). I’m not sure If it’s necessary though. The only documentation I’ve found so far is how to implement a lock statement with threading but I’m not using the threading namespace. What best practice and how would I implement this without threading or should I be using threading?Thanks in advance!
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May 22, 2006
Hi,
I have set of 2 DTS packages, one of which calls the other by forming a command-line (dtexec) using a Execute Process task.
From the parent package-> Execute Process Task->
dtsexec /F etc... /<pkg variable> = "servername"
Each of the parent and the called package have a variable: "User::DWServerSQLInstance" which is mapped to the SQL server connection manager server name property using an expression. The outer package has the above variable and so does the inner called package (which gets assigned through the command line from the outerpackage call to inner)
I "sometimes" get the following error:
OnError,I4,TESTDOMAdministrator,ACDWAggregation,{A1F8E43F-15F1-4685-8C18-6866AB31E62B},{77B2F3C7-6756-46EB-8C01-D880598FB4B3},5/22/2006 5:10:28 PM,5/22/2006 5:10:28 PM,-1073659822,0x,The variable "User::DWServerSQLInstance" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
Help would be appreciated!
I have seen other posts on this but, not able to relate the solution to my scenario.
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May 10, 2006
Hi All,
I have seen a few other people have this error.
Package works fine when run from BIDS, DTExec, dtexecui. When I schedule it, It get these random errors. (See below)
The main culprit is a variable called "RecordsetFileDIR" which is set using an expression. (@[User::_ROOT] + "RecordSets\")
A number of other variables use this as part of their expression and as they all fail, pretty much everything dies.
I have installed SP1 (Not Beta) on server. Package uses config files to set the value of _ROOT.
The error does not always seem to be with this particular variable though. Always a variable that uses an expression but errors are random. Also, It will run 3 out of 10 times without a problem. I am the only person on the server at the time.
Any ideas?
Cheers,
Crispin
Error log:
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073659822,0x,The variable "User::RecordsetFileDIR" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073639420,0x,The expression for variable "rsHeaderFile" failed evaluation. There was an error in the expression.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
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Mar 27, 2006
Where to write XQuery statements?
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Oct 5, 2007
Hi
I have a stored procedure and i am trying to add case statements to them.. but i am getting an Error. which is
Msg 125, Level 15, State 3, Procedure udf_EndDate, Line 34
Case expressions may only be nested to level 10.
And This is my sproc-- ================================================
-- Template generated from Template Explorer using:
-- Create Scalar Function (New Menu).SQL
--
-- Use the Specify Values for Template Parameters
-- command (Ctrl-Shift-M) to fill in the parameter
-- values below.
--
-- This block of comments will not be included in
-- the definition of the function.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:<Author,,Name>
-- Create date: <Create Date, ,>
-- Description:<Description, ,>
-- =============================================
Create FUNCTION [dbo].[udf_EndDate] (@PeriodId int)
RETURNS datetime
AS
BEGIN
DECLARE
@Month int,
@Year char(4)
SELECT
@Month = [Month],
@Year = Cast([Year] as char(4))
FROM
Period
WHERE
PeriodId = @PeriodId
RETURN
CASE @Month WHEN 1 THEN '1/31/' + @Year ELSE
CASE @Month WHEN 2 THEN '2/28/' + @Year ELSE
CASE @Month WHEN 3 THEN '3/31/' + @Year ELSE
CASE @Month WHEN 4 THEN '4/30/' + @Year ELSE
CASE @Month When 5 Then '5/31/' + @Year ELSE
CASE @Month When 6 Then '6/30/' + @Year ELSE
CASE @Month When 7 Then '7/31/' + @Year ELSE
CASE @Month When 8 Then '8/31/' + @Year ELSE
CASE @Month When 9 Then '9/30/' + @Year ELSE
CASE @Month When 10 Then '10/31/' + @Year ELSE
CASE @Month When 11 Then '11/30/' + @Year ELSE
CASE @Month When 12 Then '12/31/' + @Year ELSE null END
END
END
END
END
END
END
END
END
END
END
END
END
Any help will be appreciated.
Regards
Karen
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Jun 25, 2015
We are not allowed to write delete statement in a function. It will give the below error.
"Invalid use of a side-effecting operator 'DELETE' within a function."
We will get the same error for truncate/drop statements.
What is the reason behind this error?
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Feb 2, 2007
I simply made my script task (or any other task) fail
In my package error handler i have a Exec SQL task - for Stored Proc
SP statement is set in following expression (works fine in design time):
"EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"
From progress:
Error: The Script returned a failure result.
Task SCR REIL Data failed
OnError - Task SQL Insert Error Msg
Error: A deadlock was detected while trying to lock variable "System::ErrorCode, System::ErrorDescription, System::ExecutionInstanceGUID, System::StartTime, User::FEED_ID, User::t_ProcessedFiles" for read access. A lock could not be acquired after 16 attempts and timed out.
Error: The expression ""EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"" on property "SqlStatementSource" cannot be evaluated. Modify the expression to be valid.
Warning: The Execution method succeeded, but the number of errors raised (4) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
And how did I get 4 errors? - I only set my script task result to failure
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Jul 20, 2015
I have a script that automates some db drop/restore operations and bringing the database to single user mode is part of it: ALTER DATABASE ... SET SINGLE_USER WITH ROLLBACK IMMEDIATE...I want this to executes under a login, that has restricted privileges, so I've created a login and granted it a dbcreator role + ALTER ANY DATABASE privileges.
Problem: When I run the script against a database with an active/sleeping connection:It fails when using the restricted login: "Msg 5061...ALTER DATA BASE failed because a lock could not be placed on database ..."It completes successfully when using a sysadmin login According to stackoverflow.com the solution is to kill the active/sleeping connections to the database, before ALTER-ing it, which works fine, but the question is....
Questions: Why the "ALTER DATABASE..." statement works under the sysadmin login, but not under a dbcreator one?Does this mean the sysadmin login kills the connections to the target database in the background?Is it possible to grant additional privileges to the restricted login, so the "ALTER DATABASE..." statement won't need preventive killing of the connections?
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Jul 24, 1999
I am querying my dBase "Reservations" to obtain a range of dates for
rooms in our hotel that are available for a vacationer to reserve...
this is the my present SQL structure (two tables(roomReserve & roomDescribe inner joined)
**********************
SELECT roomReserve.availibility, roomDescribe.numRooms
FROM roomDescribe INNER JOIN roomReserve ON roomDescribe.code = roomReserve.code
WHERE (((roomReserve.availibility) Between 8/20/99 And 8/23/99) AND ((roomDescribe.numRooms)>0));
****************************
The problem is that I do not want any room open dates (roomReserve.Availibility) to come up if any of the days in between the date range have 0 rooms available (in other words no room available on that date) (roomReserve.numRooms)>0
But they do because the query is not correctly written to be an all or none recordset for the date range time peroid…
For example, if I query for the date range of 8/20/99 to 8/23/99 using a criteria that the room must be available (>0), and let's say the date 8/21/99 has 0 rooms available for the King Fireplace room, then the query's results set gives me a list of the other 3 dates (8/20, 8/22, 8/23) for when the King Fireplace room is available...
I don't want anything thing for that date range to come out if any of the dates (within that range 8/20-8/23) have a room status = 0 during that time period...
I need a way to receive an all or none recordset result... with only one query statement…
I do not want to have to query a query… if that's at all possible…
thank you... chris james
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Jun 8, 2007
I just started working with MS SQL. I'm attempting to find the equivalent of the MySQL commands STATUS and SHOW STATUS.
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May 14, 2008
select *
from OPS_TimeCards tc
join OPS_TimeCardHours tch on tch.TimeCardID = tc.TimeCardID
join OPS_Projects pj on pj.ProjectID = tch.ProjectID
where tch.TimeCardID = @TimeCardID
Union
select *
from OPS_TimeCards tc
join OPS_TimeCardExpenses tce on tce.TimeCardID = tc.TimeCardID
join OPS_Projects pj on pj.ProjectID = tce.ProjectID
where tce.TimeCardID = @TimeCardID
I have this query but when i try to use the UNION i get this error
Msg 205, Level 16, State 1, Procedure GetTimeCardSearchResults, Line 24
All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.
I need to run both of these queries but have them return one result set....anyone know how to do???
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Sep 26, 2007
Ok in Replication for sql 2000,'
what happens when a query such as 'update tableA set a=1 where id=5' affects 1 row. What will happen when it does not affect any row.
Aaron
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Sep 12, 2011
One annoying problem has occurred....I want to put database in offline mode....but it is giving me some error...
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Jul 24, 2000
I am using SQL Server 6.5 and this database has 50 database tables and each table has 10000 records in it. So, in short it is very big database. Very often I get the "Database Lock" problem. I tried to tune the database but no help. Is it like that if I upgrade SQL Server 6.5 to SQL Server 7.0, will it help me ? If yes, how ?
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Jan 29, 2004
In my system I got a problem.
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Subhasish
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Mar 23, 2007
Hello,
I created a form that retrieve a number from a database. Can I lock that record so that other people cannot access it?
Similar to "lock" function in Visual Fox Pro database.
Best regards,
Tee Song Yann
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Mar 22, 2004
Somebody can give some tips or hints for speed up my querys and procedures from sql and get more performance, what is best to use, joins o cursors, using cursors can give me more performance?
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Oct 21, 2005
Hello,
I've got a trouble with my query and left outer joins. I've got 2 tables, table A and B, both have the same record called ID. I used this query:
SELECT *
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This is OK and works fine, my trouble comes when i have a duplicated ID on both A and B. Instead of return 2 fields, it returns me 4.
Is there some way to force SQl server to return only the first founded on B, but the 2 duplicated IDs on the A table?
Thanks for all.
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Apr 17, 2008
I have two databases with table structures exactly the same. The query in one database works and returns correctly. The same query (copied and pasted) in another database returns the correct records but completely ignores the order by. Even stranger, when you are creating the query under modify and run it, it is fine. But when I right-click on the query and go to 'Open View' then the query does not return correctly. Below is the query:
SELECT TOP (100) PERCENT pf.description AS incentive, CAST(i.targetc AS FLOAT) AS targetc, i.targetp, b.basis, d.description, i.iSelect, i.direction, pf.pValue,
pf.pFigure
FROM dbo.PerfFactorWeights AS pfw INNER JOIN
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Feb 1, 2007
Hi there!I'm programming in delphi and new to querieng MS SQL Server. Is there a wayto monitor the queries sent to the server and something of the returns. Atleast execution time would be interesting ...Thx in advance,Fritz
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Apr 7, 2004
Hi
We are facing an acute situation in our web-application. Technology is ASP.NEt/VB.NET, SQL Server 2000.
Consider a scenario in which User 1 is clicking on a button which calls a SQL stored procedure. This procedure selects Group A of records of Database Page1.
At the same time if User 2 also clicks the same button which calls same SQL stored procedure. This procedure selects Group B of records of Database Page1.
So, its the same Page1 but different sets of records. At this moment, both the calls have shared locked on the Page1 inside the procedure.
Now, in call 1, inside the procedure after selecting Group A of records, the next statement is and update to those records. As soon as update statement executes, SQL Server throws a deadlock exception as follows :
Transaction (Process ID 78) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction
We are able to understand why its happening. Its because, Group A and Group B of records are on the same Page1. But both the users have shared lock on the Page1. So, no one gets the exclusive lock in records for update, even though, the records are different.
How can I resolve this issue? How can I get lock on wanted rows instead of entire page?
Please advice. Thanks a bunch.
Pankaj
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Feb 14, 2008
Hi all,
In the VB 2005 Express, I can get the SqlConnection and ConnectionString of a Database "shcDB" in the Object Explorer of SQL Server Management Studio Express (SSMSE) by the following set of code:
///--CallshcSpAdoNetVB2005.vb--////
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Public Class Form1
Public Sub InsertNewFriend()
Dim connectionString As String = "Data Source=.SQLEXPRESS;Initial Catalog=shcDB;Integrated Security=SSPI;"
Dim connection As SqlConnection = New SqlConnection(connectionString)
Try
connection.Open()
Dim command As SqlCommand = New SqlCommand("sp_insertNewRecord", connection)
command.CommandType = CommandType.StoredProcedure
.......................................
etc.
///////////////////////////////////////////////////////
If the Database "shcDB" and the Stored Procedure "sp_inertNewRecord" are in the Database Explorer of VB 2005 Express, I plan to use "Data Source=local" in the following code statements to get the SqlConnection and ConnectionString:
.........................
........................
Dim connectionString As String = "Data Source=local;Initial Catalog=shcDB;Integrated Security=SSPI;"
Dim connection As SqlConnection = New SqlConnection(connectionString)
Try
connection.Open()
Dim command As SqlCommand = New SqlCommand("sp_insertNewRecord", connection)
command.CommandType = CommandType.StoredProcedure
........................
etc.
Is the "Data Source=local" statement right for this case? If not, what is the right code statement for my case?
Please help and advise.
Thanks,
Scott Chang
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Mar 10, 2004
Hello folks!
I'm with two locks on a database and I can't access others databases too, except the master.
I've tryed to kill the lock, but I didn't have sucess.
Please help me!!!
Cheers!
Rafael
SPID DBID OBJID INDID TYPE MODE STATUS
9500DBS GRANT
9500DB X GRANT
511855753430TAB IS GRANT
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Feb 21, 2006
Hi,I need to lock a database (prevent users from connecting) in order toupdate it. I already know how to kick everyone out with their spid buti can't figure how to prevent them from reconnecting.Thanks !
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Aug 3, 2006
Hi,
How do I lock entire database? I want an exclusive lock on the db by
a user
who is the dbo of that database only (not sa
user).
The
scenario is we have a web application and each week we need to do data
uploads (with etl). During this upload, the users accessing the website
should not be able to read data. This is why I want database lock.
Now
the catch here is, the application access the data using user say abc.
Abc is dbo for that database and the etl is also done by abc login. So
will db locking help in this case as the website can also read the data
being a abc user?
Thanks,
Tanmaya
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Aug 10, 2005
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Mar 11, 2008
i keep getting an error when trying to move some data out of a suspect database i switched to recovery mode.
any ideas on how to get the data moved?
select * into test.dbo.mailable_new from response.dbo.mailable
Server: Msg 601, Level 12, State 3, Line 2
Could not continue scan with NOLOCK due to data movement.
Thanks!
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Mar 1, 2006
Hi,
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What I got is a document about how to run a silent installation (document " Using Command Prompt Options to install SQL Server Express") but this docs there's no solution how to run querys after the installation.
Thanks
Robert-Paul
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Nov 26, 2002
I am in the process of writing a stored procedure that takes data from a table, within a cursor, and puts that data to the network server via the xp_cmdshell procedure. The xp_cmdshell command is at the end of the cursor in the SP.
I have worked with the admins on getting the proper permissions to execute this procedure and have tested it by running the procedure directly in Query Analyzer and by calling it in Query Analyzer successfully.
However when I try to call this procedure from another programming envirnoment, once the xp_cmdshell process is called, the procedure locks up and blocks the rest of the process, including the other software programming environment. When I look at the error log, it indicates that correct command, as a matter of fact I have copied the log file command into Query Analyzer and ran the procedure successfully. So for some reason, the statement is not being committed or there is some kind of threading issue I do not know how to address.
If anyone out there has any suggestions or has a simular problem in the past and knows how to address it, it would be greatly appreciated.
Thanks!
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Jul 10, 2014
I have question on lock on table in SQL Server while inserting data using multiple processes at a single time into same table.Here are my questions on this,
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2) if yes to Q1, then how we can implicitly mention while inserting data.
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Jul 20, 2005
I was at a conference and had it asserted to me by an Oracleafficiando that Oracle and DB2 handled low-level locks "better" thanSQL Server, and that this was likely the cause of SQL Server'srelatively slower and more deadlock-prone performance when running thesame application. (SQL does seem to perform more poorly for this app,a PeopleSoft customer service and billing app.)Is there any significant difference in lock escalation strategiesbetween major databases, and if so, what are the implications?Jeff Roughgarden, MSCD, MCDBA
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Jul 26, 2007
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Thanks,
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May 9, 2015
I have a column colC in a table myTable that has a value (e.g. '0X'). The position of a non-zero character in column colC refers to the ordinal position of another column in the table myTable (in the aforementioned example, colB).To get a column name (i.e., colA or colB) from table myTable, I can join ("ON cte.pos = cn.ORDINAL_POSITION") to INFORMATION_SCHEMA.COLUMNS for that table catalog, schema and name. But I want to show the value of what is in that column (e.g., 'ABC'), not just the name. Hoping for:
COLUMN_NAME Value
----------- -----
colB 123
colA XYZ
I've tried dynamic SQL to no success, probably not executing the concept correctly..Below is what I have:
CREATE TABLE myTable (colA VARCHAR(3), colB VARCHAR(3), colC VARCHAR(3))
INSERT INTO myTable (colA, colB, colC) VALUES ('ABC', '123', '0X')
INSERT INTO myTable (colA, colB, colC) VALUES ('XYZ', '789', 'X0')
;WITH cte AS
(
SELECT CAST(PATINDEX('%[^0]%', colC) AS SMALLINT) pos, STUFF(colC, 1, PATINDEX('%[^0]%', colC), '') colC
FROM myTable
[code]....
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