489

我问了一个问题,得到了这个有帮助的答复。

   UPDATE TABLE_A a JOIN TABLE_B b
   ON a.join_col = b.join_col AND a.column_a = b.column_b
   SET a.column_c = a.column_c + 1

现在,如果有三个表涉及这样的事情,我希望这样做。

    UPDATE tableC c JOIN tableB b JOIN tableA a

我的问题基本上是......是否可以对一个UPDATE语句进行三个表连接?它的正确语法是什么?

我是否执行以下操作?

 JOIN tableB, tableA
 JOIN tableB JOIN tableA
4

7 回答 7

851

答案是肯定的,你可以。

试试这样:

UPDATE TABLE_A a
    JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
    JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1

对于一般更新加入:

UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]
于 2013-03-04T19:28:20.073 回答
46

实现相同结果的另一种方法是根本不使用JOIN关键字。

UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col
于 2015-06-17T15:31:13.880 回答
13

下面是包含和的更新查询。同样,我们可以使用多个 join/where 子句:JOINWHERE

UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
 SET oc.forecast_stage_c = 'APX'
 WHERE o.deleted = 0
   AND o.sales_stage IN('ABC','PQR','XYZ')
于 2017-06-19T14:56:56.010 回答
3

另一种总体计划

UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}

例子:

UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;
于 2017-05-31T17:18:07.003 回答
2

是的,您可以为更新语句执行三表连接。这是一个例子:

UPDATE customer_table c

  JOIN
      employee_table e
      ON c.city_id = e.city_id
  JOIN
      anyother_ table a
      ON a.someID = e.someID

SET c.active = "Yes"

WHERE c.city = "New york";
于 2020-07-20T12:46:48.753 回答
1

对于 PostgreSQL 示例:

UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;
于 2017-12-28T08:24:43.157 回答
0

没有一个答案对我不起作用我在 mysql 手册上找到了这个

UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2,       T2.C3 = expr WHERE condition
于 2022-01-01T10:53:18.173 回答