如何修复此查询？我将继续在mySQL中获得错误代码1248

Question

我在mySQL中继续收到错误代码1248   SELECT INV_NUM，AVG_INV，（INV_AMOUNT - AVG_INV）AS DIFF     来自CH08_INVOICE，         （从CH08_INVOICE中选择AVG（INV_AMOUNT）AS AVG_INV）     GROUP BY INV_NUM，AVG_INV，INV_AMOUNT- AVG_INV;

Answer 1

SELECT INV_NUM, AVG_INV, (INV_AMOUNT - AVG_INV) AS DIFF
FROM CH08_INVOICE,
(SELECT AVG(C2.INV_AMOUNT)  AS AVG_INV  FROM CH08_INVOICE C2) AS T
GROUP BY INV_NUM, AVG_INV, INV_AMOUNT- AVG_INV;

由于您没有汇总发票金额，我不确定您是否需要该组。

Answer 2

您需要为内部查询添加别名。类似于：

(SELECT AVG(c.INV_AMOUNT)  AS AVG_INV  FROM CH08_INVOICE c)

因为内部查询和外部查询都在同一个表上工作