Return 在 MySql 中使用 max() 时出现意外设置

Question

我需要在他们最后一次进入时设置 where STATUS = Need Corrections。

对于给定的集合：我需要第 3 行和第 5 行，因为订单 ORD001 的最后一个条目（即）max(entry) 是 2，订单 ORD003 的 max(entry) 是 1，它们的状态为 'Need Corrections'.

我尝试了这些查询但得到了错误的结果。

SELECT * 来自 QC WHERE STATUS = 'Need Corrections' AND ENTRY IN(SELECT MAX(ENTRY) FROM QC) GROUP BY PRD_ORDER;

SELECT * FROM QC WHERE STATUS = 'Need Corrections' AND ENTRY IN(SELECT MAX(ENTRY) FROM QC) ORDER BY PRD_ORDER;

Answer 1

你并不遥远

MariaDB [sandbox]> create table t(id int ,pr_order varchar(10),entry int, status varchar(20));
Query OK, 0 rows affected (0.14 sec)

MariaDB [sandbox]> insert into t values
    -> (1,'o1',1,'NC'),
    -> (2,'o2',1,'NC'),
    -> (3,'o1',2,'NC'),
    -> (4,'o2',2,'F'),
    -> (5,'o3',1,'F');
Query OK, 5 rows affected (0.00 sec)
Records: 5  Duplicates: 0  Warnings: 0

MariaDB [sandbox]>
MariaDB [sandbox]> select t.*
    -> from t t
    -> where t.status = 'NC'
    -> and t.entry = (select max(t1.entry) from t t1 where t1.pr_order = t.pr_order);
+------+----------+-------+--------+
| id   | pr_order | entry | status |
+------+----------+-------+--------+
|    3 | o1       |     2 | NC     |
+------+----------+-------+--------+
1 row in set (0.00 sec)

Return 在 MySql 中使用 max() 时出现意外设置

Return unexpected set while using max() in MySql

mysql

group-by

max

sql-order-by