Sql Oracle中定义不明确的列

我试图在Oracle中执行CASE，但我遇到了这个错误

我在SQL SERVER中也做了类似的事情，并且它可以正常工作

 SELECT SUM(amount) as AMOUNT,Substr(con.DATES, 1,6 ) as DATES,
       CASE
          WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
            THEN 'WORKSHOPS'
            end as "ORIGIN"
   FROM AMOUNTS_B con inner join PRODUCTOS pro on con.product = pro.cod_product
        where DATES >= '20180101'
        group by FECHA, ORIGIN;

---

如果表有别名，为什么会发生错误？

您的表没有

ORIGIN

列，这是您在

SELECT

子句中定义的别名，不能在

groupby

子句中使用该别名

重复

案例

语句：

SELECT SUM(amount) as AMOUNT,
       Substr(con.DATES, 1,6 ) as DATES,
       CASE
         WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
         THEN 'WORKSHOPS'
       end as "ORIGIN"
FROM   AMOUNTS_B con
       inner join PRODUCTOS pro
       on con.product = pro.cod_product
WHERE  Substr(con.DATES, 1,6 ) >= '20180101'
group by FECHA,
       CASE
         WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
         THEN 'WORKSHOPS'
       end;

或者使用外部查询，该查询可以使用别名：

SELECT SUM(amount) as AMOUNT,
       DATES,
       ORIGIN
FROM   (
  SELECT amount,
         fecha,
         Substr(con.DATES, 1,6 ) as DATES,
         CASE
           WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
           THEN 'WORKSHOPS'
         end as "ORIGIN"
  WHERE  Substr(con.DATES, 1, 6 ) >= '20180101'
  FROM   AMOUNTS_B con
         inner join PRODUCTOS pro
         on con.product = pro.cod_product
)
group by FECHA,
       ORIGIN;

---

（注意：在

分组依据

子句中，您可能还需要

日期

。

您的表没有

原点

列，这是您在

选择

子句中定义的别名，不能在

分组依据

子句中使用该别名

重复

案例

语句：

SELECT SUM(amount) as AMOUNT,
       Substr(con.DATES, 1,6 ) as DATES,
       CASE
         WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
         THEN 'WORKSHOPS'
       end as "ORIGIN"
FROM   AMOUNTS_B con
       inner join PRODUCTOS pro
       on con.product = pro.cod_product
WHERE  Substr(con.DATES, 1,6 ) >= '20180101'
group by FECHA,
       CASE
         WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
         THEN 'WORKSHOPS'
       end;

或者使用外部查询，该查询可以使用别名：

SELECT SUM(amount) as AMOUNT,
       DATES,
       ORIGIN
FROM   (
  SELECT amount,
         fecha,
         Substr(con.DATES, 1,6 ) as DATES,
         CASE
           WHEN pro.cod_grup in ('54') and pro.cod_grup_2 in ('38')
           THEN 'WORKSHOPS'
         end as "ORIGIN"
  WHERE  Substr(con.DATES, 1, 6 ) >= '20180101'
  FROM   AMOUNTS_B con
         inner join PRODUCTOS pro
         on con.product = pro.cod_product
)
group by FECHA,
       ORIGIN;

（注意：在

分组依据

子句中，您可能还需要

日期

。）