Question

我的样本表如下：

TASKMASTER
TASKKEY  TASKCOLTYPE01 TASKCOLDATA01
  001           1          DONE
  002           2           2
  003           3           3

TASKCOLTYPE值：1 =文字，2 =是/否，3 =高/中/低

我有一个案例陈述：

SELECT TASKCOLTYPE01, TASCOLDATA01, CASE TASKCOLTYPE01 = 2
  THEN CASE TASKCOLDATA01 =1 THEN 'YES' ELSE 'NO
  CASE TASKCOLTYPE02 =3
  THEN CASE TASKCOLDATA01=1 THEN 'HIGH WHEN TASKCOLDATA01 =2 THEN 'MID' ELSE 'LOW END
  ELSE (RETURN the value itself)
END FROM TASKMASTER;

我想在表格中显示数据col（＆＃39; DONE＆＃39;在此示例中）

Answer 1

希望这有帮助。

  drop table TASKMASTER;
Create table TASKMASTER (
  TASKKEY VARCHAR2(3)
, TASKCOLTYPE01 varchar2(255)
, TASKCOLDATA01 varchar2(255)
);
insert all 
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (001, 1, 'DONE')
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (002, 2, 2)
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (002, 2, 1)
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (003, 3, 1)
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (003, 3, 2)
  into TASKMASTER (TASKKEY, TASKCOLTYPE01, taskcoldata01) values (003, 3, 3)
select * from dual;

SELECT TASKCOLTYPE01, TASKCOLTYPE01, TASKCOLDATA01,
        CASE 
          when TASKCOLTYPE01 = 2
          THEN  (CASE when TASKCOLDATA01 =1 THEN 'YES' ELSE 'NO' end)
          when TASKCOLTYPE01 = 3
          THEN (  CASE  when TASKCOLDATA01=1 THEN 'HIGH'
                        WHEN TASKCOLDATA01 =2 THEN 'MID' 
                        ELSE 'LOW' 
                  END)
          ELSE ( Taskcoldata01)
        END result
FROM TASKMASTER;

Answer 2

答案是

ELSE TO_CHAR（USERTASK.TASKCOLDATA01）

它将返回表字段中的值。

希望有所帮助！

案例陈述与COL内部的数据相等

2 个答案: