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. > 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. > 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. > 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. > 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.