How do I return multiple results in a MySQL subquery with IN()?

In MySQL, you can easily return multiple results, but also achieve this with subquery using IN(). Let us first create a table −

mysql> create table DemoTable1317
-> (
-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> Name varchar(20)
-> );
Query OK, 0 rows affected (0.49 sec)

Insert some records in the table using insert command

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)

Display all records from the table using select statement −

mysql> select *from DemoTable1317;

Output

+----+--------------+
| 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)

Following is the query to return multiple results in a MySQL subquery −

mysql> select Name from DemoTable1317
-> where Id IN ( select Id from DemoTable1317);

Output

+--------------+
| Name         |
+--------------+
| Chris Brown  |
| John Doe     |
| Adam Smith   |
| John Smith   |
| David Miller |
| Carol Taylor |
+--------------+
6 rows in set (0.00 sec)