作业29

作业

#1. 查看岗位是teacher的员工姓名、年龄
mysql> select database();
+------------+
| database() |
+------------+
| test2      |
+------------+
1 row in set (0.00 sec)

mysql> show tables;
+-----------------+
| Tables_in_test2 |
+-----------------+
| teacherinfo     |
+-----------------+
1 row in set (0.00 sec)


mysql> desc teacherinfo;
+--------------+---------------+------+-----+---------+----------------+
| Field        | Type          | Null | Key | Default | Extra          |
+--------------+---------------+------+-----+---------+----------------+
| id           | int(11)       | NO   | PRI | NULL    | auto_increment |
| name         | char(10)      | YES  |     | NULL    |                |
| age          | tinyint(4)    | YES  |     | NULL    |                |
| describetion | varchar(32)   | NO   |     |         |                |
| salary       | decimal(18,8) | YES  |     | NULL    |                |
| year_salary  | decimal(18,8) | YES  |     | NULL    |                |
+--------------+---------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)


mysql> select name,age from teacherinfo ;
+------------+------+
| name       | age  |
+------------+------+
| kaifeng    |   18 |
| liukaifeng |   18 |
| feng       |   18 |
| kai        |   20 |
| kaizi      |   31 |
| laokai     |   35 |
| laokai     |   35 |
| laokai     |   35 |
| jinsa      |   19 |
+------------+------+
9 rows in set (0.00 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 teacherinfo where age > 30 ;
+--------+------+
| name   | age  |
+--------+------+
| kaizi  |   31 |
| laokai |   35 |
| laokai |   35 |
| laokai |   35 |
+--------+------+
4 rows in set (0.00 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,salary from teacherinfo where salary between 9000 and 10000 ;
Empty set (0.00 sec)
	

# 	4. 查看岗位描述不为NULL的员工信息
mysql> select * from teacherinfo where describetion is null;
Empty 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 * from teacherinfo where salary=10000 or salary=9000 or salary=30000;
Empty 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 * from teacherinfo where not (salary=10000 or salary=9000 or salary=30000);
+----+------------+------+--------------+-------------------+------------------+
| id | name       | age  | describetion | salary            | year_salary      |
+----+------------+------+--------------+-------------------+------------------+
|  1 | kaifeng    |   18 |              |  1000000.00000000 | 9999999.00000000 |
|  2 | liukaifeng |   18 |              |  1000000.00000000 | 9999999.00000000 |
|  3 | feng       |   18 |              |  1000000.00000000 | 9999999.00000000 |
|  4 | kai        |   20 |              |  1000000.00000000 | 9999999.00000000 |
|  5 | kaizi      |   31 |              |  1000000.00000000 | 9999999.00000000 |
|  6 | laokai     |   35 |              |  1000000.00000000 | 9999999.00000000 |
|  7 | laokai     |   35 |              |      100.00000000 | 9999999.00000000 |
|  8 | laokai     |   35 |              |      100.00000000 |  999999.00000000 |
|  9 | jinsa      |   19 |              | 99999999.00000000 | 8888888.00000000 |
+----+------------+------+--------------+-------------------+------------------+
9 rows 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,year_salary from teacherinfo where  name like 'jin%';
+-------+------------------+
| name  | year_salary      |
+-------+------------------+
| jinsa | 8888888.00000000 |
+-------+------------------+
1 row in set (0.00 sec)