MySQL第九次作业-连接查询＆子查询

1. 查询“Chisel”所在车间的车间编号、车间主任姓名、主任联系方式   
2. select no,name,phone from lingjinzheng_workshop where no in(select
   shop_no from zhongzheng_worker where name=“Chisel”);

 

查询所有员工姓名、员工联系电话、车间地址、车间主任姓名、主任联系方式

 select z.name,z.phone,x.address,x.name,x.phone from lingjinzheng_worker
z right join lingjinzheng_workshop x on z.shop_no=x.no;

 

查询“Chisel”所在车间的所有员工姓名、员工联系电话、车间地址
select z.name,z.phone,x.address from lngjinzheng_worker z inner join
lingjinzheng_workshop x on z.shop_no=x.no where z.shop_no=“WS1”;

 查询生产出质量达标产品的产品编号、员工姓名、员工联系电话
select z.no,x.name,x.phone from lingjinzheng_product z inner join
lingjinzheng_worker x on z.work_no=x.no where is_qualified=“1”

1. 查询已生产产品车间的车间号、平均工龄

select shop_no ,avg(seniority) from lingjinzheng_worker where
shop_no=“WS2”;

 

查询所有产品的产品编号、是否合格（合格返回true不合格返回false）、员工号、员工姓名、员工联系方式、车间编号、车间地址
select z.no,z.is_qualified,a.no,a.name,a.phone,b.no,b.address from
linjinzheng_product z inner join lingjinzheng_worker a on z.work_no=a.no
inner join lingjinzheng_workshop b on a.shop_no=b.no;

 

1. 查询员工表中是否存在“common”工种的员工，如果存在则查询员工表“common”工种员工的所有字段信息

select * from lingjinzheng_worker where work_type=“common”;

 

查询存在离职员工的车间编号、车间主任、主任联系方式
select no,name,phone from lingjinzheng_workshop where no in(select
shop_no from lingjinzheng_worker where is_onwork=“0”);