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法律研究带 WHERE 子句的 MySQL GROUP BY 且条件计数大于 1？
为了理解包含 where 子句的 group by，让我们创建一个表。如下是创建表的查询 -
mysql> create table GroupByWithWhereClause -> ( -> Id int NOT NULL AUTO_INCREMENT, -> IsDeleted tinyint(1), -> MoneyStatus varchar(20), -> UserId int, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.57 sec)
现在，您可以使用 insert 命令在表中插入一些记录。查询如下 -
mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'Undone',101); Query OK, 1 row affected (0.17 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',101); Query OK, 1 row affected (0.19 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',101); Query OK, 1 row affected (0.14 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',102); Query OK, 1 row affected (0.18 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(1,'Undone',102); Query OK, 1 row affected (0.20 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(1,'done',102); Query OK, 1 row affected (0.59 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'Undone',103); Query OK, 1 row affected (0.15 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',103); Query OK, 1 row affected (0.20 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',103); Query OK, 1 row affected (0.18 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',103); Query OK, 1 row affected (0.10 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',104); Query OK, 1 row affected (0.14 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'Undone',104); Query OK, 1 row affected (0.12 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(1,'Undone',105); Query OK, 1 row affected (0.15 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(1,'done',105); Query OK, 1 row affected (0.26 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(1,'done',105); Query OK, 1 row affected (0.12 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',105); Query OK, 1 row affected (0.24 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'Undone',106); Query OK, 1 row affected (0.23 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',106); Query OK, 1 row affected (0.16 sec) mysql> insert into GroupByWithWhereClause(IsDeleted,MoneyStatus,UserId) values(0,'done',106); Query OK, 1 row affected (0.14 sec)
使用 select 语句显示表中的所有记录。
查询如下 -
mysql> select *from GroupByWithWhereClause;
以下是输出 -
+----+-----------+-------------+--------+ | Id | IsDeleted | MoneyStatus | UserId | +----+-----------+-------------+--------+ | 1 | 0 | Undone | 101 | | 2 | 0 | done | 101 | | 3 | 0 | done | 101 | | 4 | 0 | done | 102 | | 5 | 1 | Undone | 102 | | 6 | 1 | done | 102 | | 7 | 0 | Undone | 103 | | 8 | 0 | done | 103 | | 9 | 0 | done | 103 | | 10 | 0 | done | 103 | | 11 | 0 | done | 104 | | 12 | 0 | Undone | 104 | | 13 | 1 | Undone | 105 | | 14 | 1 | done | 105 | | 15 | 1 | done | 105 | | 16 | 0 | done | 105 | | 17 | 0 | Undone | 106 | | 18 | 0 | done | 106 | | 19 | 0 | done | 106 | +----+-----------+-------------+--------+ 19 rows in set (0.00 sec)
以下是包含 WHERE 子句的 GROUP BY 查询 -
mysql> SELECT * FROM GroupByWithWhereClause -> WHERE IsDeleted= 0 AND MoneyStatus= 'done' -> GROUP BY SUBSTR(UserId,1,3) -> HAVING COUNT(*) > 1 -> ORDER BY Id DESC;
以下是输出 -
+----+-----------+-------------+--------+ | Id | IsDeleted | MoneyStatus | UserId | +----+-----------+-------------+--------+ | 18 | 0 | done | 106 | | 8 | 0 | done | 103 | | 2 | 0 | done | 101 | +----+-----------+-------------+--------+ 3 rows in set (0.00 sec)
更新于： 30-7-2019
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