استفاده از IF در دستور WHERE SQL

DECLARE @accountType TINYINT;
DECLARE @price BIGINT;
DECLARE @buySideValue TINYINT = 1;
DECLARE @othersAccountTypeValue TINYINT = 5;
DECLARE @clientAccountTypeValue TINYINT = 1;

SELECT *
FROM Decision
WHERE Quantity > 0
  AND (
        (
                    @accountType = @othersAccountTypeValue
                AND
                    side = @buySideValue
        )
        OR
        (
                    @accountType = @clientAccountTypeValue
                AND
                    Price > @price
        )
    );