How to write case in stored procedure when checking the multiple condition as well as in using group by clause?

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There are two boolean checkboxes in UI.
When it is unchecked in the UI, through stored procedure - it should retrieve the count of users assigned with that field in the database table.

Which is better either If-Else or Case Statements in stored procedures?
Also, getting errors in the below tried query.

What I have tried:

ALTER PROCEDURE GetCountOfFieldUsers
@prodId INT,
@approver BIT,
@contractor BIT,

AS
BEGIN
SELECT COUNT(userId),
CASE WHEN @approver = 0
WHERE prodId = @prodId AND approver = 1 GROUP BY prodId
CASE WHEN @contractor = 0
WHERE prodId = @prodId AND contractor = 1 GROUP BY prodId
FROM session_login
END
END

Posted 31-May-21 23:47pm

Member 14953087

Updated 1-Jun-21 0:07am

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Wendelius · Accepted Answer · 2021-06-01T00:07:00

You're getting an error because the syntax of your select statement is invalid.
The select should be in format

SQL

SELECT...
FROM ...
WHERE ...
GROUP BY ...

You cannot change the places of different clauses.

What comes to the question, since you're using different columns in the WHERE clause depending on the parameter, I'd recommend using IF...ELSE structure and completely separate statements.