文章目录
- 练习1:
- 1.创建数据库dbtest11
- 2.运行以下脚本创建表my_employees
- 3.显示表my_employees的结构
- 4.向my_employees表中插入下列数据
- 5.向users表中插入数据
- 6.将3号员工的last_name修改为“drelxer”
- 7.将所有工资少于900的员工的工资修改为1000
- 8.将userid为Bbiri的user表和my_employees表的记录全部删除
- 9.删除my_employees、users表所有数据
- 10.检查所作的修正
- 11.清空表my_employees
- 练习2:
- 1.使用现有数据库dbtest11
- 2. 创建表格pet
- 3. 添加记录
- 4.添加字段:主人的生日owner_birth DATE类型。
- 5.将名称为Claws的猫的主人改为kevin
- 6.将没有死的狗的主人改为duck
- 7.查询没有主人的宠物的名字;
- 8.查询已经死了的cat的姓名,主人,以及去世时间;
- 9.删除已经死亡的狗
- 10.查询所有宠物信息
- 练习3:
- 1.使用已有的数据库dbtest11
- 2.创建表employee,并添加记录
- 3.查询出薪资在1200~1300之间的员工信息。
- 4 .查询出姓“刘”的员工的工号,姓名,家庭住址。
- 5.将“李四”的家庭住址改为“广东韶关”
- 6.查询出名字中带“小”的员工
练习1:
1.创建数据库dbtest11
create DATABASE dbtest11 CHARACTER SET 'utf8';
2.运行以下脚本创建表my_employees
USE dbtest11;
CREATE TABLE my_employees(
id INT(10),
first_name VARCHAR(10),
last_name VARCHAR(10),
userid VARCHAR(10),
salary DOUBLE(10,2)
);
CREATE TABLE users(
id INT,
userid VARCHAR(10),
department_id INT);
3.显示表my_employees的结构
DESC my_employees;
4.向my_employees表中插入下列数据
– ID FIRST_NAME LAST_NAME USERID SALARY
– 1 patel Ralph Rpatel 895
– 2 Dancs Betty Bdancs 860
– 3 Biri Ben Bbiri 1100
– 4 Newman Chad Cnewman 750
– 5 Ropeburn Audrey Aropebur 1550
INSERT INTO my_employees
VALUES
(1, 'patel', 'Ralph', 'Rpatel', 895),
(2, 'Dancs', 'Betty', 'Bdancs', 860),
(3, 'Biri', 'Ben', 'Bbiri', 1100),
(4, 'Newman', 'Chad', 'Cnewman', 750),
(5, 'Ropeburn', 'Audrey', 'Aropebur', 1550);
SELECT * FROM my_employees;
5.向users表中插入数据
– 1 Rpate 10
– 2 Bdancs 10
– 3 Bbiri 20
– 4 Cnewman 30
– 5 Aropebur 40
DESC users;
INSERT INTO users VALUES
(1, 'Rpate', 10),
(2, 'Bdancs', 10),
(3, 'Bbiri', 20),
(4, 'Cnewman', 30),
(5, 'Aropebur', 40);
SELECT * FROM users;
6.将3号员工的last_name修改为“drelxer”
UPDATE my_employees
SET last_name = 'drelxer'
WHERE id = 3;
7.将所有工资少于900的员工的工资修改为1000
UPDATE my_employees
SET salary = 1000
WHERE salary < 900;
SELECT * FROM my_employees;
8.将userid为Bbiri的user表和my_employees表的记录全部删除
DELETE FROM users
WHERE userid = 'Bbiri';
DELETE FROM my_employees
WHERE userid = 'Bbiri';
9.删除my_employees、users表所有数据
DELETE FROM users;
DELETE FROM my_employees;
10.检查所作的修正
SELECT * FROM users;
SELECT * FROM my_employees;
11.清空表my_employees
TRUNCATE TABLE my_employees;
练习2:
1.使用现有数据库dbtest11
USE dbtest11
2. 创建表格pet
CREATE TABLE pet(
name VARCHAR(20),
owner VARCHAR(20),
species VARCHAR(20),
sex CHAR(1),
birth YEAR,
death YEAR
);
DESC pet;
3. 添加记录
INSERT INTO pet VALUES
('Fluffy','harold','Cat','f','2003','2010'),
('Claws','gwen','Cat','m','2004',NULL),
('Buffy',NULL,'Dog','f','2009',NULL),
('Fang','benny','Dog','m','2000',NULL),
('bowser','diane','Dog','m','2003','2009'),
('Chirpy',NULL,'Bird','f','2008',NULL);
SELECT *
FROM pet;
4.添加字段:主人的生日owner_birth DATE类型。
ALTER TABLE pet
ADD owner_birth DATE;
5.将名称为Claws的猫的主人改为kevin
UPDATE pet
SET owner = 'kevin'
WHERE name = 'Claws' AND species = 'Cat';
6.将没有死的狗的主人改为duck
UPDATE pet
SET owner = 'duck'
WHERE species = 'Dog' AND death IS NULL;
7.查询没有主人的宠物的名字;
SELECT name
FROM pet
WHERE owner IS NULL;
8.查询已经死了的cat的姓名,主人,以及去世时间;
SELECT name,owner,death
FROM pet
WHERE death IS NOT NULL AND species = 'Cat';
9.删除已经死亡的狗
DELETE FROM pet
WHERE death IS NOT NULL AND species = 'Dog';
10.查询所有宠物信息
SELECT *
FROM pet;
练习3:
1.使用已有的数据库dbtest11
USE dbtest11;
2.创建表employee,并添加记录
CREATE TABLE employee(
id INT,
NAME VARCHAR(15),
sex CHAR(1),
tel VARCHAR(25),
addr VARCHAR(35),
salary DOUBLE(10,2)
);
DESC employee;
INSERT INTO employee VALUES
(10001,'张一一','男','13456789000','山东青岛',1001.58),
(10002,'刘小红','女','13454319000','河北保定',1201.21),
(10003,'李四','男','0751-1234567','广东佛山',1004.11),
(10004,'刘小强','男','0755-5555555','广东深圳',1501.23),
(10005,'王艳','男','020-1232133','广东广州',1405.16);
SELECT * FROM employee;
3.查询出薪资在1200~1300之间的员工信息。
SELECT *
FROM employee
WHERE salary BETWEEN 1200 AND 1300;
4 .查询出姓“刘”的员工的工号,姓名,家庭住址。
SELECT id,name,addr
FROM employee
WHERE name LIKE '刘%';
5.将“李四”的家庭住址改为“广东韶关”
UPDATE employee
SET addr = '广东韶关'
WHERE NAME = '李四';
6.查询出名字中带“小”的员工
SELECT *
FROM employee
WHERE name LIKE '%小%';