如何在 MySQL 子查询中使用 IN() 返回多条结果?
在 MySQL 中,你可以轻松地返回多个结果,同时也可以通过使用 IN() 的子查询来实现这一目标。首先,我们创建一个表 -
mysql> create table DemoTable1317 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.49 sec)
使用插入命令向表中插入一些记录
mysql> insert into DemoTable1317(Name) values('Chris Brown'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1317(Name) values('John Doe'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1317(Name) values('Adam Smith'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1317(Name) values('John Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1317(Name) values('David Miller'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1317(Name) values('Carol Taylor'); Query OK, 1 row affected (0.14 sec)
使用 select 语句来显示表中的所有记录 -
mysql> select *from DemoTable1317;
输出
+----+--------------+ | Id | Name | +----+--------------+ | 1 | Chris Brown | | 2 | John Doe | | 3 | Adam Smith | | 4 | John Smith | | 5 | David Miller | | 6 | Carol Taylor | +----+--------------+ 6 rows in set (0.00 sec)
以下是返回 MySQL 子查询中多个结果的查询 -
mysql> select Name from DemoTable1317 -> where Id IN ( select Id from DemoTable1317);
输出
+--------------+ | Name | +--------------+ | Chris Brown | | John Doe | | Adam Smith | | John Smith | | David Miller | | Carol Taylor | +--------------+ 6 rows in set (0.00 sec)
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