如何在 UPDATE 查询中执行三个表 JOIN？

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]

achieving the same result 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

下面是包含 JOIN 和 WHERE 的 update 查询。同样，我们可以使用多个 join/where 子句：

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')

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;

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";

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;

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