SQL Union Query - 两个访问表

Posted 2023-03-24

【中文标题】SQL Union Query - 两个访问表

【英文标题】：SQL Union Query - two access tables

【发布时间】：2019-03-06 09:14:02

【问题描述】：

我在 MS Access 中有两个相同的查询，qryLabour 和 qryMaterials。我需要从三个字段中获取总数：Labour Mins、Laser Mins 和 $ Cost。

我知道这可以使用联合查询来完成，但我已经很久没有使用联合查询了，而且我不断收到“FROM 语句错误”。

我的 SQL 是：

SELECT sum(TotalLabour) as TotalLabour,sum(TotalCost) as TotalCost,sum(TotalLaser) as TotalLaser
FROM

(
SELECT Sum([qryLabour].[Labour Mins]) AS TotalLabour, Sum([qryLabour].[$ Cost]) AS TotalCost, Sum([qryLabour].[Laser Mins]) AS TotalLaser
FROM qryLabour;

union all

SELECT Sum([qryMaterial].[Labour Mins]) AS TotalLabour, Sum([qryMaterial].[$ Cost]) AS TotalCost, Sum([qryMaterial].[Laser Mins]) AS TotalLaser
FROM qryMaterial;

)

请有人告诉我哪里出错了？如果我删除***“选择”语句，我会得到两行，其中包含总计，这是我添加***语句以合并两者的时候。

【问题讨论】：

可能通过将别名放在右括号中将解决问题) M 但不确定

删除那些分号。 (;)

【参考方案1】：

请注意，但我认为您需要一个别名：

SELECT sum(u.TotalLabour) as TotalLabour,sum(u.TotalCost) as TotalCost,sum(u.TotalLaser) as TotalLaser
FROM

(
SELECT Sum([qryLabour].[Labour Mins]) AS TotalLabour, Sum([qryLabour].[$ Cost]) AS TotalCost, Sum([qryLabour].[Laser Mins]) AS TotalLaser
FROM qryLabour

union all

SELECT Sum([qryMaterial].[Labour Mins]) AS TotalLabour, Sum([qryMaterial].[$ Cost]) AS TotalCost, Sum([qryMaterial].[Laser Mins]) AS TotalLaser
FROM qryMaterial

) as u

编辑：同时删除“;”在子查询中，正如@jarlh 建议的那样

【参考方案2】：

谢谢杰迪普。

我实际上只是想通了，我在内部 SELECT 语句的末尾有 ;，我删除了它，并使父 SELECT 中的名称唯一。现在工作得很好。

所以正确的代码是：

SELECT sum( tempTotalLabour) as TotalLabour,sum( tempTotalCost) as TotalCost,sum( tempTotalLaser) as TotalLaser
FROM

(
SELECT Sum([qryLabour].[Labour Mins]) AS tempTotalLabour, Sum([qryLabour].[$ Cost]) AS  tempTotalCost, Sum([qryLabour].[Laser Mins]) AS tempTotalLaser
FROM qryLabour

union all

SELECT Sum([qryMaterial].[Labour Mins]) AS  tempTotalLabour, Sum([qryMaterial].[$ Cost]) AS  tempTotalCost, Sum([qryMaterial].[Laser Mins]) AS  tempTotalLaser
FROM qryMaterial

) ;

干杯 克里斯