sql"case when"用法

---用法一：
SELECT
            CASE WHEN STATE = '1' THEN '成功'
                 WHEN STATE = '2' THEN '失败'
            ELSE '其他' END  
            FROM  SYS_SCHEDULER
---用法二：    
SELECT STATE
            CASE WHEN '1' THEN '成功'
                 WHEN '2' THEN '失败'
            ELSE '其他' END  
            FROM  SYS_SCHEDULER