使用连接和位置更新值

Question

我尝试过以下命令：

UPDATE staff SET salary = (salary * 1.1)
where branchno = (select branchno from branch where city = 'London');

update salary from staff s join branch b on s.branchno = b.branchno
where b.city = 'London' set salary = salary * 1.1;

但是，我将此作为错误回复：

> ERROR:  more than one row returned by a subquery used as an expression

有什么想法吗？基本上我想更新所有员工工资的成员在伦敦生活的10％，但我必须加入员工和分支表来获得分支机构的位置。

Answer 1

您的查询转换为正确的连接语法：

UPDATE staff s
SET    salary = (salary * 1.1)
FROM   branch b
WHERE  b.city = 'London'
AND    s.branchno = b.branchno;

这可以避免报告的错误。 The manual has more on UPDATE.