关于Update语句在不同数据库中的差别
Oralce和DB2都支持的语法:
UPDATE A
SET (A1, A2, A3) = (SELECT B1, B2, B3 FROM B WHERE A.ID = B.ID)
MS SQL Server不支持这样的语法,相对应的写法为:
UPDATE A
SET A1 = B1, A2 = B2, A3 = B3
FROM A LEFT JOIN B ON A.ID = B.ID
个人感觉MS SQL Server的Update语法功能更为强大。MS SQL SERVER的写法:
UPDATE A
SET A1 = B1, A2 = B2, A3 = B3
FROM A, B WHERE A.ID = B.ID
在Oracle和DB2中的写法就比较麻烦了,如下:
UPDATE A
SET (A1, A2, A3) = (SELECT B1, B2, B3 FROM B WHERE A.ID = B.ID)
WHERE ID IN (SELECT B.ID FROM B WHERE A.ID = B.ID)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
MS SQL Server不支持这样的语法,相对应的写法为:
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
个人感觉MS SQL Server的Update语法功能更为强大。MS SQL SERVER的写法:
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
在Oracle和DB2中的写法就比较麻烦了,如下:
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)
![](/Images/OutliningIndicators/None.gif)