69 lines
1.6 KiB
Markdown
69 lines
1.6 KiB
Markdown
```sql
|
|
#1 创建表
|
|
CREATE TABLE t_family(
|
|
fno INT(11) PRIMARY KEY AUTO_INCREMENT,
|
|
eno INT(11) NOT NULL COMMENT '职工编号',
|
|
ename VARCHAR(255) NOT NULL COMMENT '职工姓名',
|
|
faname VARCHAR(255),
|
|
moname VARCHAR(255)
|
|
);
|
|
|
|
#2 添加字段
|
|
ALTER TABLE t_salary ADD grade VARCHAR(255) COMMENT '评级';
|
|
|
|
#3 修改字段数据类型
|
|
ALTER TABLE t_employee MODIFY sex ENUM('男', '女');
|
|
|
|
#4 更新记录
|
|
UPDATE t_department d
|
|
SET d.tel = '128'
|
|
WHERE d.dname = '法务部';
|
|
|
|
#5 条件、排序查询
|
|
SELECT e.ename, e.sex, e.birthday
|
|
FROM t_employee e
|
|
WHERE e.birthday >= '2000-1-1'
|
|
ORDER BY e.birthday DESC;
|
|
|
|
#6 分组、多表连接查询
|
|
SELECT d.dname, SUM(s.basepay + s.overtime + s.allowance + s.insurance)
|
|
FROM t_employee e, t_department d, t_salary s
|
|
WHERE e.dno = d.dno AND e.eno = s.eno
|
|
GROUP BY d.dno;
|
|
|
|
#7 分组+排序 视图
|
|
CREATE VIEW v_jobcount AS
|
|
SELECT j.jobtitle, COUNT(*)
|
|
FROM t_employee e, t_job j
|
|
WHERE e.jobno = j.jno
|
|
GROUP BY j.jno
|
|
ORDER BY 2;
|
|
|
|
#8 触发器
|
|
CREATE TRIGGER tri_updateGrade
|
|
BEFORE UPDATE ON t_salary FOR EACH ROW
|
|
BEGIN
|
|
IF NEW.basepay < 6000 THEN
|
|
SET NEW.grade = 'C';
|
|
ELSEIF NEW.basepay < 8000 THEN
|
|
SET NEW.grade = 'B';
|
|
ELSEIF NEW.basepay >= 8000 THEN
|
|
SET NEW.grade = 'A';
|
|
END IF;
|
|
END;
|
|
|
|
#9 存储过程
|
|
CREATE PROCEDURE `pro_getDepartmentTel`(in `in_dno` int,OUT dept_phone VARCHAR(100))
|
|
BEGIN
|
|
|
|
SELECT CONCAT('部门名称-', dname, '，电话-', tel) INTO dept_phone
|
|
FROM t_department
|
|
WHERE dno = in_dno limit 1;
|
|
|
|
IF dept_phone IS NULL THEN
|
|
SET dept_phone = '没有找到相应的部门';
|
|
END IF;
|
|
END
|
|
```
|
|
|