DECODE( ) function in SQL Server

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

You could use the 'CASE .. WHEN .. THEN .. ELSE .. END' syntax in SQL.