mysql - SQL 使用同一表中的 SUM 更新值

Question

我有表线索。有 ep、order_number、ont 列。我需要将每个记录集设置为具有相同 order_number 值的 SUM ep。

我试过了:

UPDATE leads as l1 SET ont = (SELECT SUM(ep) FROM leads as l2  WHERE l2.order_number= l1.order_number);

出现错误:表“l1”被指定两次，既作为“UPDATE”的目标，又作为单独的数据源

如何解决这个问题？谢谢!

Answer 1

使用多表更新版本

drop table if exists t;
create table t(ont int,op int,order_number int);
insert into t values (1,10,1),(1,2,1);

update t 
join (select order_number,sum(op) sumop from t group by order_number) t1 on t1.order_number = t.order_number
set ont = sumop;

select * from t;

+------+------+--------------+
| ont  | op   | order_number |
+------+------+--------------+
|   12 |   10 |            1 |
|   12 |    2 |            1 |
+------+------+--------------+
2 rows in set (0.00 sec)