1.基本select語句

SELECT name,age FROM employee;

2.數學符號條件

SELECT name,age,phone FROM employee WHERE name='Mary';

3.'AND'與'OR'

SELECT name,age FROM employee WHERE age BETWEEN

4.'IN'與'NOT IN'

SELECT name,age,phone,in_dpt FROM employee WHERE in_dpt NOT IN ('dpt1','dpt3');

5.萬用字元

SELECT name,age,phone FROM employee WHERE name LIKE

6.對結果排序

SELECT name,age,salary,phone FROM employee ORDER BY salary DESC;

7.SQL內建函式和計算

SELECT MAX(salary) AS max_salary,MIN(salary) FROM employee; AS重新命名

8.子查詢

(SELECT in_dpt FROM employee WHERE name='Tom');

9.連線查詢

ORDER BY id;

使用連線查詢的方式，查詢出各員工所在部門的人數與工程數，工程數命名為 count_project。（連線3個表）