作業

mysql> create table tea(
    -> id int unsigned auto_increment primary key,
    -> name varchar(50),
    -> age int,
    -> salary int,
    -> desclib varchar(50) default null
    -> )charset=utf8;
    
insert into tea(name,age,salary) values ('Jackie','19','9000');
insert into tea(name,age,salary) values ('Coach','32','30000');
insert into tea(name,age,salary) values ('Andy','26','15000');
insert into tea(name,age,salary) values ('jinx','16','3500');

# 1. 查看崗位是teacher的員工姓名、年齡
select name,age from tea;

# 2. 查看崗位是teacher且年齡大於30歲的員工姓名、年齡
select name,age from tea where age>30;

# 3. 查看崗位是teacher且薪資在9000-1000範圍內的員工姓名、年齡、薪資
select name,age,salary from tea where salary between 1000 and 9000;

# 4. 查看崗位描述不為NULL的員工信息
select * from tea where desclib is not null;

# 5. 查看崗位是teacher且薪資是10000或9000或30000的員工姓名、年齡、薪資
select name,age,salary from tea where salary in (10000,9000,30000)

# 6. 查看崗位是teacher且薪資不是10000或9000或30000的員工姓名、年齡、薪資
select name,age,salary from tea where salary not in (10000,9000,30000);

# 7. 查看崗位是teacher且名字是jin開頭的員工姓名、年薪
select name,salary*12 from tea where name like 'jin%';