Question

我的查询如下：

SELECT
    o.ordernum,
    o.SCHEDATTEMPT,
    o.lastcontactdate, 
    MAX(OE.NextContactDate) AS NextContactDate
FROM orderevents OE
FULL outer join orde_ o 
ON o.ORDERID=oe.OrderId
WHERE  O.lastcontactdate is not null and SCHEDULED is null and DROPTIME is null      
ORDER by O.LASTcontactdate

当我执行此查询时，我收到错误Column 'orde_.ORDERNUM' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.。

我在这个查询中做错了什么？

Answer 1

错误信息说明了一切，但如果你看到它的话，它的含义就更容易理解了。

在选择列表中使用聚合函数（即MAX(OE.NextContactDate)），聚合函数需要包含选择列表中的所有条目...

SELECT
    MAX(o.ordernum),        -- technically contained in an aggregate function - setting aside that it's probably not what you want otherwise
    MAX(o.SCHEDATTEMPT),    -- same
    MAX(o.lastcontactdate), -- same
    MAX(OE.NextContactDate) AS NextContactDate
FROM orderevents OE
FULL outer join orde_ o 
ON o.ORDERID=oe.OrderId
WHERE  O.lastcontactdate is not null and SCHEDULED is null and DROPTIME is null
ORDER by MAX(o.lastcontactdate)

选择列表中未包含在聚合函数中的

... 或条目必须位于GROUP BY子句中：

SELECT
    o.ordernum,
    o.SCHEDATTEMPT,
    o.lastcontactdate, 
    MAX(OE.NextContactDate) AS NextContactDate
FROM orderevents OE
FULL outer join orde_ o 
ON o.ORDERID=oe.OrderId
WHERE  O.lastcontactdate is not null and SCHEDULED is null and DROPTIME is null
GROUP BY o.ordernum, o.SCHEDATTEMPT, o.lastcontactdate -- added GROUP BY clause
ORDER by o.lastcontactdate

我怀疑你真的想要第二个修复 - 在查询中添加GROUP BY子句。

使用ORDER BY和GROUP BY一起出错

1 个答案: