WHERE子句中的SQL Server存储过程动态SQL

Question

I have written a stored procedure that accepts one parameter.

Request_ID int = 0

Later, in my WHERE clause, I need to accomplish the following.

I don't know how to describe it, but you can see what I'm trying to do with this completely made up pseudo-code:

WHERE isNull(a.Target_Department, '') <> ''
  AND isNull(a.Resolved_Date, '') = ''
  AND isNull(c.Request_Archived, '') <> 'Y'
  AND IF @Request_ID = 0 
        THEN Request_ID > 0 
        ELSE Request_ID = @Request_ID
    END

Basically, if a specific request_ID is supplied, I want the WHERE clause to narrow to only that specific Request_ID . Otherwise, I want all of them.

Any ideas on how to accomplish this?

Answer 1

Try this -->

WHERE
    (@Request_ID IS NULL OR Request_ID=@RequestID)

OR

WHERE
    (@Request_ID=0 OR Request_ID=@RequestID)

Answer 2

and isnull(nullif(@RequestId,0),RequestId)=RequestId