Oracle CASE WHEN 用法介绍

SELECT T2.*, T1.*   FROM T1, T2  WHERE (CASE WHEN T2.COMPARE_TYPE = 'A' AND                   T1.SOME_TYPE LIKE 'NOTHING%'                THEN 1              WHEN T2.COMPARE_TYPE != 'A' AND                   T1.SOME_TYPE NOT LIKE 'NOTHING%'                THEN 1              ELSE 0           END) = 1
转自：http://www.cnblogs.com/eshizhan/archive/2012/04/06/2435493.html