[英]Subtracting calculated values from two different tables in SQL (MySQL)
[英]SQL subtracting values from two different tables in Access
我有两个不同的表,每个表包含一个值。 例如:
table1 table2
|Hours_worked| |Work_Completed|
250 346
我希望查询从Work_completed中减去Hours_worked。 我尝试了这个:
SELECT (SELECT Hours_worked FROM table1)- (SELECT Work_Completed FROM table2) AS Diff
我收到错误消息:“查询输入必须包含至少一个表或查询”
任何帮助都很好,谢谢
我认为只是这样:
select Hours_worked - Work_Completed as diff
from table1, table2
只需添加FROM dual,我的意思是:
SELECT
(SELECT Hours_worked FROM table1) - (SELECT Work_Completed FROM table2) AS Diff
FROM DUAL
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