IN

Description

The IN operator allows you to specify multiple values in a WHERE clause. And it’s a shorthand for multiple OR conditions.

Syntax

1. > SELECT column1, column2, ...
2. FROM table_name
3. WHERE column_name IN (value1, value2, ...);

Examples

1. create table t2(a int,b varchar(5),c float, d date, e datetime);
2. insert into t2 values(1,'a',1.001,'2022-02-08','2022-02-08 12:00:00');
3. insert into t2 values(2,'b',2.001,'2022-02-09','2022-02-09 12:00:00');
4. insert into t2 values(1,'c',3.001,'2022-02-10','2022-02-10 12:00:00');
5. insert into t2 values(4,'d',4.001,'2022-02-11','2022-02-11 12:00:00');

7. mysql> select * from t2 where a in (2,4);
8. a   b   c   d   e
9. 2   b   2.0010  2022-02-09  2022-02-09 12:00:00
10. 4   d   4.0010  2022-02-11  2022-02-11 12:00:00

12. mysql> select * from t2 where a not in (2,4);
13. a   b   c   d   e
14. 1   a   1.0010  2022-02-08  2022-02-08 12:00:00
15. 1   c   3.0010  2022-02-10  2022-02-10 12:00:00

17. mysql> select * from t2 where b not in ('e',"f");
18. a   b   c   d   e
19. 1   a   1.0010  2022-02-08  2022-02-08 12:00:00
20. 2   b   2.0010  2022-02-09  2022-02-09 12:00:00
21. 1   c   3.0010  2022-02-10  2022-02-10 12:00:00
22. 4   d   4.0010  2022-02-11  2022-02-11 12:00:00

24. mysql> select * from t2 where e not in ('2022-02-09 12:00:00') and a in (4,5);
25. a   b   c   d   e
26. 4   d   4.0010  2022-02-11  2022-02-11 12:00:00

Constraints

• Currently, only constant lists are supported on the left side of IN.
• There can only be a single column to the left of IN, not a tuple of multiple columns.
• NULL values couldn’t appear in the list to the right of IN.