TSQL- Using CASE in WHERE clause with a < or = sign

Question

I am trying to select the IDs based on period and type of account.Each account type would have a different period. I tried the following code but it didnt like the < operator

Answer 1

You can't use CASE to swap out arbitrary bits of the query. You would need to use

   SELECT ID, Period, Type 
   FROM TABLE1
   WHERE (Type='ASSET' AND Period < @inputperiod ) 
    OR    (Type='Liability' AND Period BETWEEN @start AND @enddate)