如何从涉及两个表的查询中获取单行。 子表的一项中重复使用2个外键

Question

I have two tables

1. tbl_clubs
2. tbl_match_schedule

tbl_club has fields;

fld_id | fld_club_name

tbl_match_schedule has fields;

fld_id | fld_club_id_one | fld_club_id_two | fld_match_time.

Now the flow is that admin will 1. go to the add new match schedule. 2. Select the name of club from drop down 1 3. Select the name of the 2nd club (playing against) from drop down 2 4. Give Match time and save.

Now the problem is that I am unable to select the data properly. I need one row, but it gives me two rows when I put the following query

SELECT ms.fld_id, ms.fld_id_club_one , ms.fld_id_club_two , ms.fld_match_time, c.fld_club_name, c.fld_id FROM tbl_match_schedule as ms, tbl_club as c WHERE c.fld_id = ms.fld_id_club_one OR c.fld_id = ms.fld_id_club_two

Please help me, I want something in this form "club name one" vs "club name two" at "19:00"

I am using mysql

Answer 1

If i understand correctly this should do:

SELECT c1.fld_club_name AS 'club_name_one', c2.fld_club_name AS 'club_name_two', s.fld_match_time AS 'at' FROM tbl_match_schedule s
    LEFT JOIN tbl_clubs c1 ON s.fld_club_id_one = c1.fld_id
    LEFT JOIN tbl_clubs c2 ON s.fld_club_id_two = c2.fld_id

Of course you can add a WHERE or ORDER clause after this to suit your further needs as long as you use the c1. and c2. shorthands when you refer to the clubs as the full table name would be ambiguous.