After INSERT and setting a variable (@scopeID) with SCOPE_IDENTITY(), when I try to JOIN tables with @scopeID, I can only see the value of @scopeID, and other variables are NULL.
INSERT INTO InsertTable (col1, col2, col3)
VALUES (2, @parameter1, @parameter2);
SET @scopeID = SCOPE_IDENTITY();
SELECT @var1 = a.var1, @var2 = b.var2, @var3 = b.var3
FROM SetTable AS a
LEFT JOIN JoinTable AS b ON a.var4 = b.var4 AND b.scopeID = @scopeID
WHERE b.scopeID = @scopeID;
SELECT @var1, @var2, @var3, @scopeID;
If I set @scopeID to a specific value (such as 12345), it shows all of the variables.
What is the cause and how can I deal with this error?
I’d like to see values about all variables selected.
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1
When using SCOPE_IDENTITY() in a stored procedure to capture the last identity value inserted within the same scope, it’s important to ensure that you correctly handle the variable that stores this value. If the variable storing the SCOPE_IDENTITY() value is showing NULL in your JOIN statements, there might be several reasons for this behavior.
Ensure Immediate Assignment:
Check that no other SQL commands are between the INSERT and the SET @NewId = SCOPE_IDENTITY();.
Output the Variable:
Temporarily add PRINT or SELECT statements to verify that @NewId is being set correctly.
Check for Triggers:
If your table has triggers, they might be interfering with the SCOPE_IDENTITY(). Consider using IDENT_CURRENT(‘TableName’) if triggers are necessary and you understand the implications.
Simplify and Test:
Simplify the stored procedure to only include the INSERT and SCOPE_IDENTITY() parts and run it to see if the issue persists.
By following these steps, you should be able to troubleshoot why SCOPE_IDENTITY() is returning NULL and ensure that the variable is correctly set and used in your JOIN statements.
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