Oracle / SQL多个真实案例陈述

Question

我试图向每位员工展示SC，DC，DV，每个人都可以有1个或更多选择，例如eng 1可以有sc和dc。

所以需要得到

但是得到

我用case来设置列和数据，但是无法在同一行上获取数据

SELECT DISTINCT e.ENG_ID, 
            e.NAME, 
            e.SURNAME, 
            e.POST_CODE, 
            CASE 
              WHEN C.CLEARANCE_ID = 1 THEN 'YES' 
              ELSE 'NO' 
            END AS SC, 
            CASE 
              WHEN C.CLEARANCE_ID = 2 THEN 'YES' 
              ELSE 'NO' 
            END AS BS, 
            CASE 
              WHEN C.CLEARANCE_ID = 3 THEN 'YES' 
              ELSE 'NO' 
            END AS DV 
FROM   MAN_ENGINEERS e 
   left join MAN_CLEARANCE c 
          ON e.ENG_ID = c.ENG_ID;

希望这是有道理的

Answer 1

在这些列上使用max，试​​试这个

SELECT      e.ENG_ID, 
            e.NAME, 
            e.SURNAME, 
            e.POST_CODE, 
            MAX
            (
              CASE 
              WHEN C.CLEARANCE_ID = 1 THEN 'YES' 
              ELSE 'NO' 
              END
             ) AS SC, 
            MAX
            (
              CASE 
              WHEN C.CLEARANCE_ID = 2 THEN 'YES' 
              ELSE 'NO' 
              END
            ) AS BS, 
           MAX
           (
              CASE 
              WHEN C.CLEARANCE_ID = 3 THEN 'YES' 
              ELSE 'NO' 
              END
            ) AS DV 
FROM   MAN_ENGINEERS e 
   left join MAN_CLEARANCE c 
          ON e.ENG_ID = c.ENG_ID
GROUP BY e.ENG_ID, 
            e.NAME, 
            e.SURNAME, 
            e.POST_CODE, ;