1、替代inner join, left join(*=), right join(=*)
select A.UserID, B.WorkFlowStatus from A ,B B where A.UserID=B.UserID
这样就可以替代Inner join
select A.UserID, B.WorkFlowStatus from A ,B B where A.UserID*=B.UserID
通过*=或=*替代
2、update的多种格式
表A有UserID, WorkFlowStatus 表B中有UserID， update A.UserID=3的WorkFlowStatus为A1
update U set u.WorkFlowStatus='A1'
from UserLicense U
inner join UserInformation I on U.UserID=I.UserID where U.ID=3
小结：其实update中也可以使用Innser join来约束条件的
