DECODE( ) function in SQL Server

Question

SELECT PC_COMP_CODE,
       \'R\',
       PC_RESUB_REF,
       DECODE(PC_SL_LDGR_CODE, \'02\', \'DR\', \'CR\'),
       PC_DEPT_NO DEPT,
       \'\', --PC_DEPT_NO,
           


        

Answer 1

If I understand the question correctly, you want the equivalent of decode but in T-SQL

Select YourFieldAliasName =
CASE PC_SL_LDGR_CODE
    WHEN '02' THEN 'DR'
    ELSE 'CR'
END

Answer 2

In my Case I used it in a lot of places first example if you have 2 values for select statement like gender (Male or Female) then use the following statement:

SELECT CASE Gender WHEN 'Male' THEN 1 ELSE 2 END AS Gender

If there is more than one condition like nationalities you can use it as the following statement:

SELECT CASE Nationality 
WHEN 'AMERICAN'   THEN 1 
WHEN 'BRITISH'   THEN 2
WHEN 'GERMAN'    THEN 3 
WHEN 'EGYPT'     THEN 4 
WHEN 'PALESTINE' THEN 5 
ELSE 6 END AS Nationality