Sunday, 8 September 2013

Mysql query same column multiple times

Mysql query same column multiple times

I am using a php user administration plugin called admidio. Now I tried to
select uid, the names and living countries of all normal members ordered
by a order key, which sounds really easy at first (see below).
So basically what I want is the usr_id, the usd_value of the table rows
with usd_id=1 as name and the usd_value of the table rows with usd_id=2 as
country from the table adm_user_data for each user where usr_rol_id=2
(table adm_members) ordered by the usd_value with usd_id=3 (table
adm_user_data).
adm_user_data
„¡„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¦„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¦„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¢
„  usr_id „  usd_id „  usd_value „  usd_id=1 ... name
„¥„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„§
usd_id=2 ... living country
„  4 „  1 „  Peter „  usd_id=3 ... order key
„¥„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„§
„  4 „  2 „  Austria „ 
„¥„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„§
„  4 „  3 „  1 „ 
„¥„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„§
„  5 „  1 „  Alex „ 
„¤„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¨„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¨„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„£
adm_members
„¡„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¦„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¢
„  usr_id „  usr_rol_id „ 
„¥„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„©„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„§ usr_rol_id=1 ... admin
„  4 „  2 „  usr_rol_id=2 ... normal member
„¤„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„¨„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„Ÿ„£
I tried many different ways (multiple table instances, multiple joins of
the same table,..) but I allways got to a point somewhen where my strategy
failed. Is it possible only using mysql or will I have to process the data
with php?
Hopefully someone understands my problem, thank you in advance.

No comments:

Post a Comment