Conditional WHERE clause in SQL Server

Question

I am creating a SQL query in which I need a conditional where clause.

It should be something like this:

SELECT 
    DateAppr,
    Time         


        

Answer 1

This seemed easier to think about where either of two parameters could be passed into a stored procedure. It seems to work:

SELECT * 
FROM x 
WHERE CONDITION1
AND ((@pol IS NOT NULL AND x.PolicyNo = @pol) OR (@st IS NOT NULL AND x.State = @st))
AND OTHERCONDITIONS