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mysql -uroot -p
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mysql> create database test
    -> ;
Query OK, 1 row affected (0.00 sec)

mysql> use test
Database changed

mysql> create table t1(
    -> id int auto_increment primary key,
    -> name varchar(255) not null,
    -> age int not null,
    -> salary int not null,
    -> work_desc varchar(255)
    -> );
Query OK, 0 rows affected (0.32 sec)

mysql> insert into t1 values
    -> (1,'slk',18,0,null),
    -> (2,'echo',31,30000,'teacher'),
    -> (3,'tank',28,15000,'teacher'),
    -> (4,'egon',5,500,null);
Query OK, 4 rows affected (0.14 sec)
Records: 4  Duplicates: 0  Warnings: 0

mysql> select * from t1;
+----+------+-----+--------+-----------+
| id | name | age | salary | work_desc |
+----+------+-----+--------+-----------+
|  1 | slk  |  18 |      0 | NULL      |
|  2 | echo |  31 |  30000 | teacher   |
|  3 | tank |  28 |  15000 | teacher   |
|  4 | egon |   5 |    500 | NULL      |
+----+------+-----+--------+-----------+
4 rows in set (0.00 sec)

--1. 查看岗位是teacher的员工姓名、年龄
mysql> select name, age
    -> from t1 where
    -> work_desc='teacher';
+------+-----+
| name | age |
+------+-----+
| echo |  31 |
| tank |  28 |
+------+-----+
2 rows in set (0.15 sec)

-- 2. 查看岗位是teacher且年龄大于30岁的员工姓名、年龄
mysql> select name, age
    -> from t1 where
    -> age > 30 and
    -> work_desc = 'teacher';
+------+-----+
| name | age |
+------+-----+
| echo |  31 |
+------+-----+
1 row in set (0.03 sec)

-- 3. 查看岗位是teacher且薪资在9000-1000范围内的员工姓名、年龄、薪资
mysql> select name, age
    -> from t1 where
    -> work_desc = 'teacher' and
    -> salary between 9000 and 10000;
Empty set (0.02 sec)

-- 4. 查看岗位描述不为NULL的员工信息
mysql> select *
    -> from t1 where
    -> work_desc != 'NULL';
+----+------+-----+--------+-----------+
| id | name | age | salary | work_desc |
+----+------+-----+--------+-----------+
|  2 | echo |  31 |  30000 | teacher   |
|  3 | tank |  28 |  15000 | teacher   |
+----+------+-----+--------+-----------+
2 rows in set (0.00 sec)

-- 5. 查看岗位是teacher且薪资是10000或9000或30000的员工姓名、年龄、薪资
mysql> select name, age, salary
    -> from t1 where
    -> work_desc = 'teacher' and
    -> salary in (10000,9000,30000);
+------+-----+--------+
| name | age | salary |
+------+-----+--------+
| echo |  31 |  30000 |
+------+-----+--------+
1 row in set (0.00 sec)

-- 6. 查看岗位是teacher且薪资不是10000或9000或30000的员工姓名、年龄、薪资
mysql> select name, age, salary
    -> from t1 where
    -> work_desc = 'teacher' and
    ->  salary not in (10000,9000,30000);
+------+-----+--------+
| name | age | salary |
+------+-----+--------+
| tank |  28 |  15000 |
+------+-----+--------+
1 row in set (0.00 sec)

-- 7. 查看岗位是teacher且名字是jin开头的员工姓名、年薪
mysql> select name, age
    -> from t1 where
    -> name like 'jin%';
Empty set (0.03 sec)

来源：https://www.cnblogs.com/shenblog/p/11759310.html

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