TASK1

  1. 查询没有提成的雇员信息，列出其工号、姓名、薪水、岗位。

    select userid 工号,concat(last_name,first_name) 姓名,salary 薪水,title 岗位 from s_emp where commission_pct is null or commission_pct = 0;
​
+----------+---------------------+---------+--------------------+
| 工号     | 姓名                | 薪水    | 岗位               |
+----------+---------------------+---------+--------------------+
| cvelasqu | VelasquezCarmen     | 2500.00 | President          |
| lngao    | NgaoLaDoris         | 1450.00 | VP, Operations     |
| mnagayam | NagayamaMidori      | 1400.00 | VP, Sales          |
| mquickto | Quick-To-SeeMark    | 1450.00 | VP, Finance        |
| aropebur | RopeburnAudry       | 1550.00 | VP, Administration |
| murguhar | UrguhartMolly       | 1200.00 | Warehouse Manager  |
| rmenchu  | MenchuRoberta       | 1250.00 | Warehouse Manager  |
| bbiri    | BiriBen             | 1100.00 | Warehouse Manager  |
| acatchpo | CatchpoleAntoinette | 1300.00 | Warehouse Manager  |
| mhavel   | HavelMarta          | 1307.00 | Warehouse Manager  |
| emaduro  | MaduroElena         | 1400.00 | Stock Clerk        |
| gsmith   | SmithGeorge         |  940.00 | Stock Clerk        |
| anozaki  | NozakiAkira         | 1200.00 | Stock Clerk        |
| vpatel   | PatelVikram         |  795.00 | Stock Clerk        |
| cnewman  | NewmanChad          |  750.00 | Stock Clerk        |
| amarkari | MarkarianAlexander  |  850.00 | Stock Clerk        |
| echang   | ChangEddie          |  800.00 | Stock Clerk        |
| rpatel   | PatelRadha          |  795.00 | Stock Clerk        |
| bdancs   | DancsBela           |  860.00 | Stock Clerk        |
| sschwart | SchwartzSylvie      | 1100.00 | Stock Clerk        |
+----------+---------------------+---------+--------------------+

  2. 查询last_name中第三个字母是a的员工工号、姓、名。

    select userid 工号,last_name 姓,first_name 名  from s_emp where last_name like '__a%';
​
+--------+-------+---------+
| 工号   | 姓    | 名      |
+--------+-------+---------+
| lngao  | Ngao  | LaDoris |
| echang | Chang | Eddie   |
+--------+-------+---------+

  3. 统计每个部门的最高工资、最低工资、工资总和、平均工资，保留到整数位。

    select dept_id 部门编号,round(max(salary)) 最高工资,round(min(salary)) 最低工资,round(sum(salary)),round(avg(salary)) 平均工资 from s_emp,s_dept where s_dept.id =s_emp.dept_id group by dept_id;
​
+--------------+--------------+--------------+--------------------+--------------+
| 部门编号     | 最高工资     | 最低工资     | round(sum(salary)) | 平均工资     |
+--------------+--------------+--------------+--------------------+--------------+
|           10 |         1450 |         1450 |               1450 |         1450 |
|           31 |         1400 |         1400 |               2800 |         1400 |
|           41 |         1450 |          940 |               4990 |         1248 |
|           50 |         2500 |         1550 |               4050 |         2025 |
|           32 |         1490 |         1490 |               1490 |         1490 |
|           42 |         1250 |          795 |               3245 |         1082 |
|           33 |         1515 |         1515 |               1515 |         1515 |
|           43 |         1100 |          750 |               2700 |          900 |
|           34 |         1525 |          795 |               2320 |         1160 |
|           44 |         1300 |          800 |               2100 |         1050 |
|           35 |         1450 |         1450 |               1450 |         1450 |
|           45 |         1307 |          860 |               3267 |         1089 |
+--------------+--------------+--------------+--------------------+--------------+

  4. 统计平均工资高于2000的部门，列出部门编号、部门名称以及该部门平均工资（保留到整数位）。

    select dept_id 部门编号,name 部门名称,round(avg(salary)) 平均工资 from s_emp,s_dept where s_dept.id = s_emp.dept_id group by dept_id,name having 平均工资>2000;
​
+--------------+----------------+--------------+
| 部门编号     | 部门名称       | 平均工资     |
+--------------+----------------+--------------+
|            1 | Administration |         2025 |
+--------------+----------------+--------------+

  5. 统计员工工号、姓名及其直接上司的工号、姓名

    select e1.id 上司编号,e1.userid 上司工号,concat(e1.first_name,e1.last_name) 上司姓名,e2.id 员工编号,e2.userid
员工工号,concat(e2.first_name,e2.last_name) 员工姓名 from s_emp e1 join s_emp e2 wheree2.manager_id=e1.id;
​
+--------------+--------------+---------------------+--------------+--------------+---------------------+
| 上司编号     | 上司工号     | 上司姓名            | 员工编号     | 员工工号     | 员工姓名            |
+--------------+--------------+---------------------+--------------+--------------+---------------------+
|            1 | cvelasqu     | CarmenVelasquez     |            2 | lngao        |LaDorisNgao         |
|            1 | cvelasqu     | CarmenVelasquez     |            3 | mnagayam     |MidoriNagayama      |
|            1 | cvelasqu     | CarmenVelasquez     |            4 | mquickto     |MarkQuick-To-See    |
|            1 | cvelasqu     | CarmenVelasquez     |            5 | aropebur     |AudryRopeburn       |
|            2 | lngao        | LaDorisNgao         |            6 | murguhar     |MollyUrguhart       |
|            2 | lngao        | LaDorisNgao         |            7 | rmenchu      |RobertaMenchu       |
|            2 | lngao        | LaDorisNgao         |            8 | bbiri        |BenBiri             |
|            2 | lngao        | LaDorisNgao         |            9 | acatchpo     |AntoinetteCatchpole |
|            2 | lngao        | LaDorisNgao         |           10 | mhavel       |MartaHavel          |
|            3 | mnagayam     | MidoriNagayama      |           11 | cmagee       |ColinMagee          |
|            3 | mnagayam     | MidoriNagayama      |           12 | hgiljum      |HenryGiljum         |
|            3 | mnagayam     | MidoriNagayama      |           13 | ysedeghi     |YasminSedeghi       |
|            3 | mnagayam     | MidoriNagayama      |           14 | mnguyen      |MaiNguyen           |
|            3 | mnagayam     | MidoriNagayama      |           15 | adumas       |AndreDumas          |
|            6 | murguhar     | MollyUrguhart       |           16 | emaduro      |ElenaMaduro         |
|            6 | murguhar     | MollyUrguhart       |           17 | gsmith       |GeorgeSmith         |
|            7 | rmenchu      | RobertaMenchu       |           18 | anozaki      |AkiraNozaki         |
|            7 | rmenchu      | RobertaMenchu       |           19 | vpatel       |VikramPatel         |
|            8 | bbiri        | BenBiri             |           20 | cnewman      |ChadNewman          |
|            8 | bbiri        | BenBiri             |           21 | amarkari     |AlexanderMarkarian  |
|            9 | acatchpo     | AntoinetteCatchpole |           22 | echang       |EddieChang          |
|            9 | acatchpo     | AntoinetteCatchpole |           23 | rpatel       |RadhaPatel          |
|           10 | mhavel       | MartaHavel          |           24 | bdancs       |BelaDancs           |
|           10 | mhavel       | MartaHavel          |           25 | sschwart     |SylvieSchwartz      |
+--------------+--------------+---------------------+--------------+--------------+---------------------+

  6. 查询没有提成的雇员信息，列出其工号、姓名、薪水、岗位。

    select s_e.userid 员工工号,concat(s_e.last_name,s_e.first_name) 姓名,s_e.dept_id 部门编号,s_d.name 部门名称,s_r.name 部门所在地区 from s_emp s_e,s_dept s_d,s_region s_r wheres_e.dept_id = s_d.id and s_d.region_id = s_r.id;
​
+--------------+---------------------+--------------+----------------+----------------------+
| 员工工号     | 姓名                | 部门编号     | 部门名称       | 部门所在地区         |
+--------------+---------------------+--------------+----------------+----------------------+
| mquickto     | Quick-To-SeeMark    |           10 | Finance        | North America        |
| mnagayam     | NagayamaMidori      |           31 | Sales          | North America        |
| cmagee       | MageeColin          |           31 | Sales          | North America        |
| lngao        | NgaoLaDoris         |           41 | Operations     | North America        |
| murguhar     | UrguhartMolly       |           41 | Operations     | North America        |
| emaduro      | MaduroElena         |           41 | Operations     | North America        |
| gsmith       | SmithGeorge         |           41 | Operations     | North America        |
| cvelasqu     | VelasquezCarmen     |           50 | Administration | North America        |
| aropebur     | RopeburnAudry       |           50 | Administration | North America        |
| hgiljum      | GiljumHenry         |           32 | Sales          | South America        |
| rmenchu      | MenchuRoberta       |           42 | Operations     | South America        |
| anozaki      | NozakiAkira         |           42 | Operations     | South America        |
| vpatel       | PatelVikram         |           42 | Operations     | South America        |
| ysedeghi     | SedeghiYasmin       |           33 | Sales          | Africa / Middle East |
| bbiri        | BiriBen             |           43 | Operations     | Africa / Middle East |
| cnewman      | NewmanChad          |           43 | Operations     | Africa / Middle East |
| amarkari     | MarkarianAlexander  |           43 | Operations     | Africa / Middle East |
| mnguyen      | NguyenMai           |           34 | Sales          | Asia                 |
| rpatel       | PatelRadha          |           34 | Sales          | Asia                 |
| acatchpo     | CatchpoleAntoinette |           44 | Operations     | Asia                 |
| echang       | ChangEddie          |           44 | Operations     | Asia                 |
| adumas       | DumasAndre          |           35 | Sales          | Europe               |
| mhavel       | HavelMarta          |           45 | Operations     | Europe               |
| bdancs       | DancsBela           |           45 | Operations     | Europe               |
| sschwart     | SchwartzSylvie      |           45 | Operations     | Europe               |
+--------------+---------------------+--------------+----------------+----------------------+
​

TASK2

  1. create table t_students (id int auto_increment comment '学生编号',name varchar(20)comment '学生姓名' not null ,gender varchar(10) comment '学生性别',primary key(id));
​
create table t_courses (id int auto_increment comment '课程编号',name varchar(20)comment '课程名称' not null unique, credit varchar(20) not null comment '学分',primarykey (id));
​
create table t_scores(sid int comment '学生编号',cid int comment '课程编号',exam_time date not null comment '考试时间',score float comment '考试成绩');
​
alter table t_scores add constraint foreign key fk_scores_students (sid) referencest_students(id);alter table t_scores add constraint foreign key fk_scores_courses (cid) referencest_courses(id);

  2. insert into t_students (id,name,gender) values (101,'张无忌','男'),(102,'赵敏','女'),(103,'小昭','女'),(104,'周芷若','女'),(105,'常遇春','男'),(106,'徐达','男');
​
insert into t_courses (id,name,credit) values (1601,'C++',3),(1602,'Java',3),(1603,'Oracle',2),(1604,'HTML/CSS',3),(1605,'数据结构',3);
​
insert into t_scores (sid,cid,exam_time,score) values  (101,1601,'2021-07-11',99),(101,1601,'2021-07-15',92),(101,1602,'2021-07-15',92),(102,1603,'2021-07-10',88),(103,1602,'2021-07-15',90),(104,1601,'2021-07-11',97),(104,1604,'2021-07-12',100);

  3. 查询每个学生每门课程的成绩，列出学生姓名、课程名称、考试时间、考试成绩。

    select st.name 学生姓名,co.name 课程名称,sc.exam_time 考试时间,sc.score 考试成绩  fromt_students st , t_course
s co,t_scores sc where sc.sid = st.id and sc.cid = co.id;
​
+--------------+--------------+--------------+--------------+
| 学生姓名     | 课程名称     | 考试时间     | 考试成绩     |
+--------------+--------------+--------------+--------------+
| 张无忌       | C++          | 2021-07-11   |           99 |
| 张无忌       | C++          | 2021-07-15   |           92 |
| 周芷若       | C++          | 2021-07-11   |           97 |
| 周芷若       | HTML/CSS     | 2021-07-12   |          100 |
| 张无忌       | Java         | 2021-07-15   |           92 |
| 小昭         | Java         | 2021-07-15   |           90 |
| 赵敏         | Oracle       | 2021-07-10   |           88 |
+--------------+--------------+--------------+--------------+

  4. 统计所有男生每门课程的平均成绩，列出课程名称、平均成绩。

    select co.name 课程名称,avg(score) 平均成绩 , st.gender 性别  from t_students st ,t_courses co,t_scores sc where sc.sid = st.id and sc.cid = co.id and st.gender='男' group by 课程名称,性别;
​
+--------------+--------------+--------+
| 课程名称     | 平均成绩     | 性别   |
+--------------+--------------+--------+
| C++          |         95.5 | 男     |
| Java         |           92 | 男     |
+--------------+--------------+--------+

  5. 查询没有学生选秀的课程信息，列出其编号、名称、学分。

    select id 课程编号,name 课程名,credit 学分  from t_courses  where id not in (select cid from t_scores);
​
+--------------+--------------+--------+
| 课程编号     | 课程名       | 学分   |
+--------------+--------------+--------+
|         1605 | 数据结构     | 3      |
+--------------+--------------+--------+

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