MySQL是一種開源的關系型數據庫管理系統。

mysql>SELECT * FROM customers WHERE age >18;
+----+----------+------------+-----+
| id | name     | birthdate  | age |
+----+----------+------------+-----+
|  1 | John     | 1990-01-01 |  30 |
|  2 | Jane     | 1995-05-10 |  25 |
|  3 | Michael  | 1985-10-21 |  35 |
|  4 | Samantha | 1998-12-05 |  22 |
+----+----------+------------+-----+
4 rows in set (0.00 sec)