MySQL —从多个表联接数据查询

Question

I would like to query from "T_Tester (table 1#)" but some data come from "T_handler (table 2#)". I tried 'inner join' but not working.

My code is here, I am pretty sure something went wrong...

     select * from T_Tester
     inner join T_handler where T_handler.Tester=T_Tester.Tester;

Table example:

    ========================
    T_Tester (table 1#)
    ========================
    Tester      Data
    Tester-001  qqq
    Tester-001  www
    Tester-001  eee
    Tester-001  rrrr
    Tester-001  ttt
    Tester-001  yyyy

    ========================
    T_handler (table 2#)
    ========================
     Tester     Handler
     Tester-001 Handler-006
     Tester-002 Handler-005
     Tester-003 Handler-004
     Tester-004 Handler-003
     Tester-005 Handler-002
     Tester-006 Handler-001

Need Help:

Output I want. Combining 2 tables with this sequence : 'T_Tester.Tester','T_handler.Handler','T_Tester.Data'.

    ========================
    Query output 
    ========================
     Tester     Handler     Data
     Tester-001 Handler-006 qqq
     Tester-001 Handler-006 www
     Tester-001 Handler-006 eee
     Tester-001 Handler-006 rrrr
     Tester-001 Handler-006 ttt
     Tester-001 Handler-006 yyyy

Answer 1

Try a left outer join .

select distinct 
    T.Tester, 
    H.Handler, 
    D.Data 
from 
    T_Tester T
        left outer join T_handler H 
            on H.Tester = T.Tester

Answer 2

You can use inner join:-

select T.Tester, H.Handler, T.Data from T_Tester T inner join T_handler H where T.Tester=H.Tester;

Refer this:- http://www.mysqltutorial.org/mysql-inner-join.aspx

http://www.w3schools.com/sql/sql_join.asp

Answer 3

select t1.Tester,t1.Handler,t2.Data from T_handler t1 inner join T_Tester t2 where t1.Tester = t2.Tester;