Question

我从多个表中选择了计数，但列是＆＃39;虽然在这里使用As子句代码

，但名称不会改变

SELECT * FROM 
(SELECT COUNT(ID) FROM  new_cards WHERE Bill_ID = '584762578412569') AS newcards,
(SELECT COUNT(ID) FROM  sold_cards WHERE Bill_ID = '584762578412569') AS soldcards

我得到2列，他们的名字都是COUNT(ID)

Answer 1

您的查询为子查询（表别名）而不是列分配别名。将别名移到列应修复它：

SELECT * FROM 
(SELECT COUNT(ID) AS newcards FROM  new_cards WHERE Bill_ID = '584762578412569') n,
(SELECT COUNT(ID) AS soldcards FROM  sold_cards WHERE Bill_ID = '584762578412569') s

从多个表中选择计数时，列名称不会更改

1 个答案: