/** 素材1 单表查询 **/
1、创建表
CREATE TABLE emp (
empno int(4) NOT NULL,
ename varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
job varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
mgr int(4) NULL DEFAULT NULL,
hiredate date NOT NULL,
sai int(255) NOT NULL,
comm int(255) NULL DEFAULT NULL,
deptno int(2) NOT NULL,
PRIMARY KEY ( empno ) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
2、插入数据
INSERT INTO emp VALUES (1001, '甘宁', '文员', 1013, '2000-12-17', 8000, NULL, 20);
INSERT INTO emp VALUES (1002, '黛绮丝', '销售员', 1006, '2001-02-20', 16000, 3000, 30);
INSERT INTO emp VALUES (1003, '殷天正', '销售员', 1006, '2001-02-22', 12500, 5000, 30);
INSERT INTO emp VALUES (1004, '刘备', '经理', 1009, '2001-04-02', 29750, NULL, 20);
INSERT INTO emp VALUES (1005, '谢逊', '销售员', 1006, '2001-09-28', 12500, 14000, 30);
INSERT INTO emp VALUES (1006, '关羽', '经理', 1009, '2001-05-01', 28500, NULL, 30);
INSERT INTO emp VALUES (1007, '张飞', '经理', 1009, '2001-09-01', 24500, NULL, 10);
INSERT INTO emp VALUES (1008, '诸葛亮', '分析师', 1004, '2007-04-19', 30000, NULL, 20);
INSERT INTO emp VALUES (1009, '曾阿牛', '董事长', NULL, '2001-11-17', 50000, NULL, 10);
INSERT INTO emp VALUES (1010, '韦一笑', '销售员', 1006, '2001-09-08', 15000, 0, 30);
INSERT INTO emp VALUES (1011, '周泰', '文员', 1006, '2007-05-23', 11000, NULL, 20);
INSERT INTO emp VALUES (1012, '程普', '文员', 1006, '2001-12-03', 9500, NULL, 30);
INSERT INTO emp VALUES (1013, '庞统', '分析师', 1004, '2001-12-03', 30000, NULL, 20);
INSERT INTO emp VALUES (1014, '黄盖', '文员', 1007, '2002-01-23', 13000, NULL, 10);
INSERT INTO emp VALUES (1015, '张三', '保洁员', 1001, '2013-05-01', 80000, 50000, 50);
/**查询要求**/
1. 查询出部门编号为30的所有员工。
mysql> select * from emp where deptno = 30;
+-------+-----------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+-------+--------+
| 1002 | 黛绮丝 | 销售员 | 1006 | 2001-02-20 | 16000 | 3000 | 30 |
| 1003 | 殷天正 | 销售员 | 1006 | 2001-02-22 | 12500 | 5000 | 30 |
| 1005 | 谢逊 | 销售员 | 1006 | 2001-09-28 | 12500 | 14000 | 30 |
| 1006 | 关羽 | 经理 | 1009 | 2001-05-01 | 28500 | NULL | 30 |
| 1010 | 韦一笑 | 销售员 | 1006 | 2001-09-08 | 15000 | 0 | 30 |
| 1012 | 程普 | 文员 | 1006 | 2001-12-03 | 9500 | NULL | 30 |
+-------+-----------+-----------+------+------------+-------+-------+--------+
6 rows in set (0.00 sec)
2. 所有销售员的姓名、编号和部门编号。
mysql> select ename,empno,deptno from emp where job = '销售员';
+-----------+-------+--------+
| ename | empno | deptno |
+-----------+-------+--------+
| 黛绮丝 | 1002 | 30 |
| 殷天正 | 1003 | 30 |
| 谢逊 | 1005 | 30 |
| 韦一笑 | 1010 | 30 |
+-----------+-------+--------+
4 rows in set (0.00 sec)
3. 找出奖金高于工资的员工。
mysql> select * from emp where comm > sai;
+-------+--------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+--------+-----------+------+------------+-------+-------+--------+
| 1005 | 谢逊 | 销售员 | 1006 | 2001-09-28 | 12500 | 14000 | 30 |
+-------+--------+-----------+------+------------+-------+-------+--------+
1 row in set (0.00 sec)
4. 找出奖金高于工资60%的员工。
mysql> select * from emp where comm > sai * 0.6;
+-------+--------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+--------+-----------+------+------------+-------+-------+--------+
| 1005 | 谢逊 | 销售员 | 1006 | 2001-09-28 | 12500 | 14000 | 30 |
| 1015 | 张三 | 保洁员 | 1001 | 2013-05-01 | 80000 | 50000 | 50 |
+-------+--------+-----------+------+------------+-------+-------+--------+
2 rows in set (0.00 sec)
5. 找出部门编号为10中所有经理,和部门编号为20中所有销售员的详细资料。
mysql> select * from emp where deptno = 10 and job = '经理' or deptno = 20 and job = '销售员';
+-------+--------+--------+------+------------+-------+------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+--------+--------+------+------------+-------+------+--------+
| 1007 | 张飞 | 经理 | 1009 | 2001-09-01 | 24500 | NULL | 10 |
+-------+--------+--------+------+------------+-------+------+--------+
1 row in set (0.00 sec)
6. 找出部门编号为10中所有经理,部门编号为20中所有销售员,还有即不是经理又不是销售员但其工 资大或等于20000的所有员工详细资料。
mysql> select * from emp where deptno = 10 and job = '经理' or deptno = 20 and job = '销售员' or job not in ('经理','销售员') and sai >= 20000;
+-------+-----------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+-------+--------+
| 1007 | 张飞 | 经理 | 1009 | 2001-09-01 | 24500 | NULL | 10 |
| 1008 | 诸葛亮 | 分析师 | 1004 | 2007-04-19 | 30000 | NULL | 20 |
| 1009 | 曾阿牛 | 董事长 | NULL | 2001-11-17 | 50000 | NULL | 10 |
| 1013 | 庞统 | 分析师 | 1004 | 2001-12-03 | 30000 | NULL | 20 |
| 1015 | 张三 | 保洁员 | 1001 | 2013-05-01 | 80000 | 50000 | 50 |
+-------+-----------+-----------+------+------------+-------+-------+--------+
5 rows in set (0.00 sec)
7. 无奖金或奖金低于1000的员工。
mysql> select * from emp where comm is null or comm < 1000;
+-------+-----------+-----------+------+------------+-------+------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+------+--------+
| 1001 | 甘宁 | 文员 | 1013 | 2000-12-17 | 8000 | NULL | 20 |
| 1004 | 刘备 | 经理 | 1009 | 2001-04-02 | 29750 | NULL | 20 |
| 1006 | 关羽 | 经理 | 1009 | 2001-05-01 | 28500 | NULL | 30 |
| 1007 | 张飞 | 经理 | 1009 | 2001-09-01 | 24500 | NULL | 10 |
| 1008 | 诸葛亮 | 分析师 | 1004 | 2007-04-19 | 30000 | NULL | 20 |
| 1009 | 曾阿牛 | 董事长 | NULL | 2001-11-17 | 50000 | NULL | 10 |
| 1010 | 韦一笑 | 销售员 | 1006 | 2001-09-08 | 15000 | 0 | 30 |
| 1011 | 周泰 | 文员 | 1006 | 2007-05-23 | 11000 | NULL | 20 |
| 1012 | 程普 | 文员 | 1006 | 2001-12-03 | 9500 | NULL | 30 |
| 1013 | 庞统 | 分析师 | 1004 | 2001-12-03 | 30000 | NULL | 20 |
| 1014 | 黄盖 | 文员 | 1007 | 2002-01-23 | 13000 | NULL | 10 |
+-------+-----------+-----------+------+------------+-------+------+--------+
11 rows in set (0.00 sec)
8. 查询名字由三个字组成的员工。
mysql> select * from emp where ename like '___'; #这里是三个下划线
+-------+-----------+-----------+------+------------+-------+------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+------+--------+
| 1002 | 黛绮丝 | 销售员 | 1006 | 2001-02-20 | 16000 | 3000 | 30 |
| 1003 | 殷天正 | 销售员 | 1006 | 2001-02-22 | 12500 | 5000 | 30 |
| 1008 | 诸葛亮 | 分析师 | 1004 | 2007-04-19 | 30000 | NULL | 20 |
| 1009 | 曾阿牛 | 董事长 | NULL | 2001-11-17 | 50000 | NULL | 10 |
| 1010 | 韦一笑 | 销售员 | 1006 | 2001-09-08 | 15000 | 0 | 30 |
+-------+-----------+-----------+------+------------+-------+------+--------+
5 rows in set (0.00 sec)
9.查询2000年入职的员工。
mysql> select * from emp where year(hiredate) = 2000;
+-------+--------+--------+------+------------+------+------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+--------+--------+------+------------+------+------+--------+
| 1001 | 甘宁 | 文员 | 1013 | 2000-12-17 | 8000 | NULL | 20 |
+-------+--------+--------+------+------------+------+------+--------+
1 row in set (0.00 sec)
10. 查询所有员工详细信息,用编号升序排序。
mysql> select * from emp order by mgr asc;
+-------+-----------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+-------+--------+
| 1009 | 曾阿牛 | 董事长 | NULL | 2001-11-17 | 50000 | NULL | 10 |
| 1015 | 张三 | 保洁员 | 1001 | 2013-05-01 | 80000 | 50000 | 50 |
| 1008 | 诸葛亮 | 分析师 | 1004 | 2007-04-19 | 30000 | NULL | 20 |
| 1013 | 庞统 | 分析师 | 1004 | 2001-12-03 | 30000 | NULL | 20 |
| 1002 | 黛绮丝 | 销售员 | 1006 | 2001-02-20 | 16000 | 3000 | 30 |
| 1003 | 殷天正 | 销售员 | 1006 | 2001-02-22 | 12500 | 5000 | 30 |
| 1005 | 谢逊 | 销售员 | 1006 | 2001-09-28 | 12500 | 14000 | 30 |
| 1010 | 韦一笑 | 销售员 | 1006 | 2001-09-08 | 15000 | 0 | 30 |
| 1011 | 周泰 | 文员 | 1006 | 2007-05-23 | 11000 | NULL | 20 |
| 1012 | 程普 | 文员 | 1006 | 2001-12-03 | 9500 | NULL | 30 |
| 1014 | 黄盖 | 文员 | 1007 | 2002-01-23 | 13000 | NULL | 10 |
| 1004 | 刘备 | 经理 | 1009 | 2001-04-02 | 29750 | NULL | 20 |
| 1006 | 关羽 | 经理 | 1009 | 2001-05-01 | 28500 | NULL | 30 |
| 1007 | 张飞 | 经理 | 1009 | 2001-09-01 | 24500 | NULL | 10 |
| 1001 | 甘宁 | 文员 | 1013 | 2000-12-17 | 8000 | NULL | 20 |
+-------+-----------+-----------+------+------------+-------+-------+--------+
15 rows in set (0.00 sec)
11. 查询所有员工详细信息,用工资降序排序,如果工资相同使用入职日期升序排序。
mysql> select * from emp order by sai desc, hiredate asc;
+-------+-----------+-----------+------+------------+-------+-------+--------+
| empno | ename | job | mgr | hiredate | sai | comm | deptno |
+-------+-----------+-----------+------+------------+-------+-------+--------+
| 1015 | 张三 | 保洁员 | 1001 | 2013-05-01 | 80000 | 50000 | 50 |
| 1009 | 曾阿牛 | 董事长 | NULL | 2001-11-17 | 50000 | NULL | 10 |
| 1013 | 庞统 | 分析师 | 1004 | 2001-12-03 | 30000 | NULL | 20 |
| 1008 | 诸葛亮 | 分析师 | 1004 | 2007-04-19 | 30000 | NULL | 20 |
| 1004 | 刘备 | 经理 | 1009 | 2001-04-02 | 29750 | NULL | 20 |
| 1006 | 关羽 | 经理 | 1009 | 2001-05-01 | 28500 | NULL | 30 |
| 1007 | 张飞 | 经理 | 1009 | 2001-09-01 | 24500 | NULL | 10 |
| 1002 | 黛绮丝 | 销售员 | 1006 | 2001-02-20 | 16000 | 3000 | 30 |
| 1010 | 韦一笑 | 销售员 | 1006 | 2001-09-08 | 15000 | 0 | 30 |
| 1014 | 黄盖 | 文员 | 1007 | 2002-01-23 | 13000 | NULL | 10 |
| 1003 | 殷天正 | 销售员 | 1006 | 2001-02-22 | 12500 | 5000 | 30 |
| 1005 | 谢逊 | 销售员 | 1006 | 2001-09-28 | 12500 | 14000 | 30 |
| 1011 | 周泰 | 文员 | 1006 | 2007-05-23 | 11000 | NULL | 20 |
| 1012 | 程普 | 文员 | 1006 | 2001-12-03 | 9500 | NULL | 30 |
| 1001 | 甘宁 | 文员 | 1013 | 2000-12-17 | 8000 | NULL | 20 |
+-------+-----------+-----------+------+------------+-------+-------+--------+
15 rows in set (0.00 sec)
12.查询每个部门的平均工资
mysql> select deptno,avg(sai) from emp group by deptno;
+--------+------------+
| deptno | avg(sai) |
+--------+------------+
| 10 | 29166.6667 |
| 20 | 21750.0000 |
| 30 | 15666.6667 |
| 50 | 80000.0000 |
+--------+------------+
4 rows in set (0.00 sec)
13.查询每个部门的雇员数量
mysql> select deptno,count(*) from emp group by deptno;
+--------+----------+
| deptno | count(*) |
+--------+----------+
| 10 | 3 |
| 20 | 5 |
| 30 | 6 |
| 50 | 1 |
+--------+----------+
4 rows in set (0.00 sec)
14.查询每种工作的最高工资、最低工资、人数
mysql> select job,max(sai),min(sai),count(*) from emp group by job;
+-----------+----------+----------+----------+
| job | max(sai) | min(sai) | count(*) |
+-----------+----------+----------+----------+
| 保洁员 | 80000 | 80000 | 1 |
| 分析师 | 30000 | 30000 | 2 |
| 文员 | 13000 | 8000 | 4 |
| 经理 | 29750 | 24500 | 3 |
| 董事长 | 50000 | 50000 | 1 |
| 销售员 | 16000 | 12500 | 4 |
+-----------+----------+----------+----------+
6 rows in set (0.00 sec)
/**素材2 多表连接查询**/
1、创建数据库
create database mydb3;
use mydb3;
2、创建部门
create table if not exists dept3(
deptno varchar(20) primary key , -- 部门号
name varchar(20) -- 部门名字
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
3、创建员工表
create table if not exists emp3(
eid varchar(20) primary key , -- 员工编号
ename varchar(20), -- 员工名字
age int, -- 员工年龄
dept_id varchar(20) -- 员工所属部门
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
4、给dept3表添加数据
insert into dept3 values('1001','研发部');
insert into dept3 values('1002','销售部');
insert into dept3 values('1003','财务部');
insert into dept3 values('1004','人事部');
4、给emp3表添加数据
insert into emp3 values('1','乔峰',20, '1001');
insert into emp3 values('2','段誉',21, '1001');
insert into emp3 values('3','虚竹',23, '1001');
insert into emp3 values('4','阿紫',18, '1001');
insert into emp3 values('5','扫地僧',85, '1002');
insert into emp3 values('6','李秋水',33, '1002');
insert into emp3 values('7','鸠摩智',50, '1002');
insert into emp3 values('8','天山童姥',60, '1003');
insert into emp3 values('9','慕容博',58, '1003');
insert into emp3 values('10','丁春秋',71, '1005');
/** 查询要求 **/
1.查询每个部门的所属员工
mysql> select * from dept3 left join emp3 on deptno=dept_id;
+--------+-----------+------+--------------+------+---------+
| deptno | name | eid | ename | age | dept_id |
+--------+-----------+------+--------------+------+---------+
| 1001 | 研发部 | 1 | 乔峰 | 20 | 1001 |
| 1001 | 研发部 | 2 | 段誉 | 21 | 1001 |
| 1001 | 研发部 | 3 | 虚竹 | 23 | 1001 |
| 1001 | 研发部 | 4 | 阿紫 | 18 | 1001 |
| 1002 | 销售部 | 5 | 扫地僧 | 85 | 1002 |
| 1002 | 销售部 | 6 | 李秋水 | 33 | 1002 |
| 1002 | 销售部 | 7 | 鸠摩智 | 50 | 1002 |
| 1003 | 财务部 | 8 | 天山童姥 | 60 | 1003 |
| 1003 | 财务部 | 9 | 慕容博 | 58 | 1003 |
| 1004 | 人事部 | NULL | NULL | NULL | NULL |
+--------+-----------+------+--------------+------+---------+
10 rows in set (0.00 sec)
2.询研发部门的所属员工
mysql> select * from dept3 left join emp3 on deptno=dept_id where name='研发部';
+--------+-----------+------+--------+------+---------+
| deptno | name | eid | ename | age | dept_id |
+--------+-----------+------+--------+------+---------+
| 1001 | 研发部 | 1 | 乔峰 | 20 | 1001 |
| 1001 | 研发部 | 2 | 段誉 | 21 | 1001 |
| 1001 | 研发部 | 3 | 虚竹 | 23 | 1001 |
| 1001 | 研发部 | 4 | 阿紫 | 18 | 1001 |
+--------+-----------+------+--------+------+---------+
4 rows in set (0.00 sec)
3.查询研发部和销售部的所属员工
mysql> select * from dept3 left join emp3 on deptno = dept_id where name in ('研发部','销售部');
+--------+-----------+------+-----------+------+---------+
| deptno | name | eid | ename | age | dept_id |
+--------+-----------+------+-----------+------+---------+
| 1001 | 研发部 | 1 | 乔峰 | 20 | 1001 |
| 1001 | 研发部 | 2 | 段誉 | 21 | 1001 |
| 1001 | 研发部 | 3 | 虚竹 | 23 | 1001 |
| 1001 | 研发部 | 4 | 阿紫 | 18 | 1001 |
| 1002 | 销售部 | 5 | 扫地僧 | 85 | 1002 |
| 1002 | 销售部 | 6 | 李秋水 | 33 | 1002 |
| 1002 | 销售部 | 7 | 鸠摩智 | 50 | 1002 |
+--------+-----------+------+-----------+------+---------+
7 rows in set (0.00 sec)
4.查询每个部门的员工数,并升序排序
mysql> select name,count(*) from dept3 left join emp3 on deptno = dept_id group by name order by count(*) asc;
+-----------+----------+
| name | count(*) |
+-----------+----------+
| 人事部 | 1 |
| 财务部 | 2 |
| 销售部 | 3 |
| 研发部 | 4 |
+-----------+----------+
4 rows in set (0.00 sec)
5.查询人数大于等于3的部门,并按照人数降序排序
mysql> select name,count(*) num from dept3 left join emp3 on deptno = dept_id group by name having (num >= 3);
+-----------+-----+
| name | num |
+-----------+-----+
| 研发部 | 4 |
| 销售部 | 3 |
+-----------+-----+
2 rows in set (0.00 sec)
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文章来源:https://www.toymoban.com/news/detail-555869.html
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