使用两个表上的连接更新查询

I have customer and address tables.

我有客户和地址表。

Query:

查询：

SELECT *
FROM addresses a,
     customers b
WHERE a.id = b.id

returns 474 records

返回474条记录

For these records, I'd like to add the id of customer table into cid of address table.

对于这些记录，我想将customer表的id添加到地址表的cid中。

Example: If for the first record the id of customer is 9 and id of address is also 9 then i'd like to insert 9 into cid column of address table.

示例：如果对于第一条记录，customer的id为9，地址id也为9，那么我想将9插入到地址表的cid列中。

I tried:

我试过了：

UPDATE addresses a,
       customers b
SET a.cid = b.id
WHERE a.id = b.id

but this does not seem to work.

但这似乎不起作用。

5 个解决方案

#1

this is Postgres UPDATE JOIN format:

这是Postgres UPDATE JOIN格式：

UPDATE address 
SET cid = customers.id
FROM customers 
WHERE customers.id = address.id

Here's the other variations: http://mssql-to-postgresql.blogspot.com/2007/12/updates-in-postgresql-ms-sql-mysql.html

以下是其他变体：http：//mssql-to-postgresql.blogspot.com/2007/12/updates-in-postgresql-ms-sql-mysql.html

#2

Using table aliases in the join condition:

在连接条件中使用表别名：

update addresses a
set cid = b.id 
from customers b 
where a.id = b.id

#3

Officially, the SQL languages does not support a JOIN or FROM clause in an UPDATE statement unless it is in a subquery. Thus, the Hoyle ANSI approach would be something like

正式地说，SQL语言不支持UPDATE语句中的JOIN或FROM子句，除非它在子查询中。因此，Hoyle ANSI方法就是这样的

Update addresses
Set cid = (
            Select c.id
            From customers As c
            where c.id = a.id
            )
Where Exists    (
                Select 1
                From customers As C1
                Where C1.id = addresses.id
                )

However many DBMSs such Postgres support the use of a FROM clause in an UPDATE statement. In many cases, you are required to include the updating table and alias it in the FROM clause however I'm not sure about Postgres:

然而，许多DBMS如Postgres支持在UPDATE语句中使用FROM子句。在许多情况下，您需要包含更新表并将其别名包含在FROM子句中，但我不确定Postgres：

Update addresses
Set cid = c.id
From addresses As a
    Join customers As c
        On c.id = a.id

#4

update addresses set cid=id where id in (select id from customers)

#5

-3

Try this one

试试这个

UPDATE employee 
set EMPLOYEE.MAIDEN_NAME = 
  (SELECT ADD1 
   FROM EMPS 
   WHERE EMP_CODE=EMPLOYEE.EMP_CODE);
WHERE EMPLOYEE.EMP_CODE >='00' 
AND EMPLOYEE.EMP_CODE <='ZZ';

#1