Question

我试图在postgres中运行以下查询：

update changeitem c inner join issuestatus s on s.id = c.oldvalue and c.field = 'status' set oldstring = s.pname;

我收到以下错误：

ERROR:  syntax error at or near "inner"
LINE 1: update changeitem c inner join issuestatus s on s.id = c.old...

我不完全确定我的陈述有什么问题。

Answer 1

尝试这种方式：

update changeitem c 
set oldstring = s.pname
from issuestatus s 
where s.id = c.oldvalue 
and c.field = 'status';

Answer 2

不幸的是，UPDATE不支持使用JOIN关键字进行显式连接。请检查official documentation。

Answer 3

正确查询：

UPDATE c 
SET oldstring = s.pname
FROM changeitem c 
WHERE c.field = 'status' 
AND c.id in (SELECT s.id FROM issuestatus s WHERE s.id = c.oldvalue)

Answer 4

试试这个：未经测试：

update changeitem as c set oldstring = s.pname from issuestatus as s where s.id = c.oldvalue and c.field = 'status' ;

Answer 5

您可以使用UPDATE WITH子句执行您要执行的操作：

update changeitem c 
set oldstring = s.pname
from issuestatus s
where  s.id = c.oldvalue and c.field = 'status';