『1』内连接查询
employee表
department表
select num,e.d_id,name,age,sex,homeaddr,d.d_name,d.function,d.address
from employee e,department d
where e.d_id=d.d_id;
『2』外连接查询
@左连接(Left Join)查询
数据表与上面同步
SELECT num,e.d_id,name,age,sex,homeaddr,d.d_name,d.function,d.address
FROM employee e left join department d
ON e.d_id=d.d_id;
@右连接(Right Join)查询
数据表与上面同步
SELECT num,e.d_id,name,age,sex,homeaddr,d.d_name,d.function,d.address
FROM employee e right join department d
ON e.d_id=d.d_id;