docs/sql-manual/sql-statements/Operators/in.md

{ “title”: “IN”, “language”: “en” }

expr IN (value, ...)

expr IN (subquery)

If expr is equal to any value in the IN list, return true; otherwise, return false.

Subquery can only return one column, and the column types returned by subquery must be compatible with expr types.

If subquery returns a bitmap data type column, expr must be an integer.

mysql> select id from cost where id in (1, 2);
+------+
| id   |
+------+
|    2 |
|    1 |
+------+

mysql> select id from tbl1 where id in (select id from tbl2);
+------+
| id   |
+------+
|    1 |
|    4 |
|    5 |
+------+

mysql> select id from tbl1 where id in (select bitmap_col from tbl3);
+------+
| id   |
+------+
|    1 |
|    3 |
+------+

IN