20

我有一个 SQL 查询,我使用 OracleCASE来比较日期列是否小于大于当前日期。但是我如何在 -CASE语句中使用该 -GROUP BY语句?我想计算每种情况下的记录。

例如

select
    (case
        when exp_date > sysdate then 1
        when exp_date <= sysdate then 2
        else 3
     end) expired, count(*)
from mytable
group by expired

但是在尝试这个时我得到一个错误:ORA-00904. 有什么建议么?

4

3 回答 3

26

使用内联视图:

SELECT expired,
       count(*)
  FROM (SELECT (CASE
                   WHEN exp_date > SYSDATE THEN 1
                   WHEN exp_date <= SYSDATE THEN 2
                   ELSE 3
                 END) AS expired
          FROM mytable)
GROUP BY expired;

希望能帮助到你...

于 2012-07-04T08:31:58.177 回答
25
select
(case
    when exp_date > sysdate then 1
    when exp_date <= sysdate then 2
    else 3
 end) expired, count(*)
from mytable
group by (case
    when exp_date > sysdate then 1
    when exp_date <= sysdate then 2
    else 3
 end)
于 2012-07-04T08:30:56.170 回答
2

作为附加输入,虽然它与此线程无关,但您也可以汇总您的案例陈述,而无需在 group by 子句中提及它。

SELECT
   WORK_ORDER_NUMBER,
   SUM(CASE WHEN STOCK_CODE LIKE 'xxxx' THEN STOCK_QUANTITY ELSE 0 END) AS TOTAL
FROM Table
GROUP BY WORK_ORDER_NUMBER;
于 2016-04-15T10:50:21.957 回答