MySQL 表记录查询小练习

Posted 2020-12-01 MrBigB

表记录查询小练习

1. 查看岗位是teacher的员工姓名、年龄
2. 查看岗位是teacher且年龄大于26岁的员工姓名、年龄
3. 查看岗位是teacher且薪资在12000-16000范围内的员工姓名、年龄、薪资
4. 查看岗位描述不为NULL的人员信息
5. 查看岗位是teacher且薪资是10000或14000员工姓名、年龄、薪资
6. 查看岗位是teacher且薪资不是10000或14000的员工姓名、年龄、薪资
7. 查看岗位是teacher且名字是b开头的员工姓名、薪资

mysql> select * from t1;
+----+---------+-----+---------+--------+----------+
| id | name    | age | job     | salary | job_desc |
+----+---------+-----+---------+--------+----------+
|  1 | alpha   |  18 | student |      0 | NULL     |
|  2 | bravo   |  25 | teacher |  10000 | python   |
|  3 | charlie |  26 | teacher |  12000 | NULL     |
|  4 | delta   |  27 | teacher |  14000 | golang   |
|  5 | echo    |  28 | teacher |  16000 | NULL     |
+----+---------+-----+---------+--------+----------+




mysql> select name,age from t1 where job='teacher';
+---------+-----+
| name    | age |
+---------+-----+
| bravo   |  25 |
| charlie |  26 |
| delta   |  27 |
| echo    |  28 |
+---------+-----+
4 rows in set (0.00 sec)

mysql> select name,age from t1 where job='teacher'and age>26;
+-------+-----+
| name  | age |
+-------+-----+
| delta |  27 |
| echo  |  28 |
+-------+-----+
2 rows in set (0.00 sec)

mysql> select name, age, salary from t1 where job='teacher'and salary between 12
000 and 16000;
+---------+-----+--------+
| name    | age | salary |
+---------+-----+--------+
| charlie |  26 |  12000 |
| delta   |  27 |  14000 |
| echo    |  28 |  16000 |
+---------+-----+--------+
3 rows in set (0.00 sec)

mysql> select * from t1 where job_desc is not NULL;
+----+-------+-----+---------+--------+----------+
| id | name  | age | job     | salary | job_desc |
+----+-------+-----+---------+--------+----------+
|  2 | bravo |  25 | teacher |  10000 | python   |
|  4 | delta |  27 | teacher |  14000 | golang   |
+----+-------+-----+---------+--------+----------+
2 rows in set (0.00 sec)

mysql> select name, age, salary from t1 where job='teacher'and salary in (10000,
 14000);
+-------+-----+--------+
| name  | age | salary |
+-------+-----+--------+
| bravo |  25 |  10000 |
| delta |  27 |  14000 |
+-------+-----+--------+
2 rows in set (0.00 sec)

mysql> select name, age, salary from t1 where job='teacher'and salary not in (10
000, 14000);
+---------+-----+--------+
| name    | age | salary |
+---------+-----+--------+
| charlie |  26 |  12000 |
| echo    |  28 |  16000 |
+---------+-----+--------+
2 rows in set (0.00 sec)

mysql> select name, salary from t1 where name like 'b%';
+-------+--------+
| name  | salary |
+-------+--------+
| bravo |  10000 |
+-------+--------+
1 row in set (0.00 sec)