A表有字段LoginName,Sex,Address;B表有UserName和LoginName想通过A表的LoginName字段的值找到B表中对应LoginName 的UserName字段
返回LoginName,Sex,Address，UserName字段
------解决方案--------------------
select LoginName,Sex,Address,LoginName from A,B where A.LoginName=B.LoginName
------解决方案--------------------
select A.*,B.UserName
from A inner join B
on A.LoginName=B.LoginName
order by A.LoginName
------解决方案--------------------
select LoginName,Sex,Address，UserName from A,B where A.LoginName=B.LoginName