這個章節是由MySQL 基本語法 (六)延伸的練習題
SELECT * FROM `employee`;
SELECT * FROM `client`;
SELECT * FROM `employee`
ORDER BY `salary`;
SELECT * FROM `employee`
ORDER BY `salary` DESC
LIMIT 3;
SELECT `name` FROM `employee`;
SELECT `sex` FROM `employee`;
SELECT DISTINCT `sex` FROM `employee`;