tsql - using CASE in T-SQL in the where clause?

Question

Im trying to use case to vary the value im checking in a where clause but I'm getting the error:

incorrect syntax near the keyword 'CASE'

SQL Server 2005

select * 
from   table
where  ((CASE when adsl_order_id like '95037%'
         then select '000000'+substring(adsl_order_id,6,6)
         ELSE select adsl_order_id
       END)
       not in (select mwebID from tmp_csv_dawis_bruger0105)

Answer 1

Here is one way to include a case statement in a Where clause:

SELECT * FROM sometable
WHERE 1 = CASE WHEN somecondition THEN 1 
    WHEN someothercondition THEN 2
    ELSE ... END