來自同一個表的 SUM 的 SQL 更新值

Question

我有桌頭。 有 ep、order_number、ont 列。 我需要每個記錄集都作為 SUM ep 並具有相同的 order_number 值。

我嘗試過這個：

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

有錯誤：表 'l1' 被指定兩次，既作為 'UPDATE' 的目標，也作為單獨的數據源

我該如何解決這個問題？ 謝謝！

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)