Question

TABLE A >>
uid name
1   test1
2   test2
3   test3
4   test4

TABLE B >>
uid address
1   address1
2   address2
4   address3

RESULT
1   test1   address1
2   test2   address2
3   test3
4   test4   address3

Can anyone show me how to write a query and fetch the result as above, Thanks very much!
i have tried join, left and right join. all result nothing.

Answer 1

You can write left outer join between this two tables Best way to understand is check the below image

Query for your requirement

SELECT A.uid, A.name, B.address FROM A LEFT JOIN B ON A.uid=B.uid 

Reading this original article on The Code Project will help you a lot: Visual Representation of SQL Joins.

Find original one at: Difference between JOIN and OUTER JOIN in MySQL.