And to find the lowest commission that any of the sales staff is earning, use this:
mysql>
mysql>
mysql> CREATE TABLE sales_rep(
-> employee_number INT,
-> surname VARCHAR(40),
-> first_name VARCHAR(30),
-> commission TINYINT
-> );
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql> INSERT INTO sales_rep values(4,'Rive','Mongane',10);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO sales_rep values(5,'Smith','Mike',12);
Query OK, 1 row affected (0.00 sec)
mysql>
mysql>
mysql> SELECT MIN(commission) FROM sales_rep;
+-----------------+
| MIN(commission) |
+-----------------+
| 10 |
+-----------------+
1 row in set (0.00 sec)
mysql>
mysql> drop table sales_rep;
Query OK, 0 rows affected (0.00 sec)
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