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Форумы / MySQL [игнор отключен] [закрыт для гостей] / finding rownum from result / 4 сообщений из 4, страница 1 из 1
23.09.2013, 16:39:12
    #38404924
Shahriyar.R
Shahriyar.R
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finding rownum from result
Dear Experts i have previously emulated Oracle like rownum in MySQL it works correctly before but at moment:

Код: sql
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set @row_num=0;

select
  @row_num:=@row_num+1,
  t.id,
  t.name,
  count(*) as total_matchs,
  sum(case when g.wins>0 then 1 else 0 end) as wins,
  sum(case when g.wins=0 then 1 else 0 end) as draw,
  sum(case when g.wins=0 then 1 else 0 end) as lost,
  sum(case sign(g.wins)
    when 1 then 3
    when 0 then 1
    else 0 end) as total_point,
  sum(g.GF) as GF,
  sum(g.GA)as GA,
  sum(g.GF)-sum(g.GA) as average
from
 (
  select 
    t.id, 
	l.match, 
	sum(case when t.id=l.team then 1 else -1 end) as wins,
	sum(case when t.id=l.team then 1 else 0 end) as GF,
	sum(case when t.id=l.team then 0 else 1 end) as GA
  from wd_teams t
  join wd_matches m on t.id in (m.home, m.away)
  join wd_timeline l on l.`match`=m.id and l.goal=1
  group by t.id, l.match
  )g
inner join wd_teams t on t.id=g.id
group by t.id, t.name
order by total_point desc,average  desc;



Output:




how i can fix it that it shows exact rownum from 1 to end?

You can check previous topic for table samples:

http://www.sql.ru/forum/1047702/how-to-find-overall-point-of-each-team-from-result

Thanks.
...
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23.09.2013, 17:42:20
    #38405017
javajdbc
javajdbc
Участник
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finding rownum from result
Shahriyar.R,

It is expected "unexpected" behaviour.
Solution is rather simple -- move
@row_num:=@row_num+1 and ORDER BY
into yet another level of select:

Код: sql
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select
  @row_num:=@row_num+1,
  zz.* 
from
(
...your big select....
) zz
order by total_point desc,average  desc;



Observations like this are numerous:
moment of evaluation of @variables is
not strictly defined except for
simplest cases.

Apparently GROUP BY and ORDER BY on the same level
bring uncertainty here.

Divide and conquer :-)
...
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23.09.2013, 22:02:34
    #38405306
Shahriyar.R
Shahriyar.R
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finding rownum from result
javajdbc,

Great forum , great people and ofcourse great experts! Thanks :)

Works like a charm:


Код: sql
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set @row_num=0;

select 
@row_num:=@row_num+1,
zz.*
from (
select
  t.id,
  t.name,
  count(*) as total_matchs,
  sum(case when g.wins>0 then 1 else 0 end) as wins,
  sum(case when g.wins=0 then 1 else 0 end) as draw,
  sum(case when g.wins=0 then 1 else 0 end) as lost,
  sum(case sign(g.wins)
    when 1 then 3
    when 0 then 1
    else 0 end) as total_point,
  sum(g.GF) as GF,
  sum(g.GA)as GA,
  sum(g.GF)-sum(g.GA) as average
from
 (
  select 
    t.id, 
	l.match, 
	sum(case when t.id=l.team then 1 else -1 end) as wins,
	sum(case when t.id=l.team then 1 else 0 end) as GF,
	sum(case when t.id=l.team then 0 else 1 end) as GA
  from wd_teams t
  join wd_matches m on t.id in (m.home, m.away)
  join wd_timeline l on l.`match`=m.id and l.goal=1
  group by t.id, l.match
  )g
inner join wd_teams t on t.id=g.id
group by t.id, t.name) as zz
order by zz.total_point desc,zz.average  desc;
...
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23.09.2013, 22:27:36
    #38405323
Shahriyar.R
Shahriyar.R
Гость
Скрыть профиль Поместить в игнор-лист Сообщения автора в теме
finding rownum from result
Also rewrite this for using without "set @@row_num=0"

Код: sql
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select 
@row_num:=@row_num+1 as rownum,
zz.*
from (
select
  t.id,
  t.name,
  count(*) as total_matchs,
  sum(case when g.wins>0 then 1 else 0 end) as wins,
  sum(case when g.wins=0 then 1 else 0 end) as draw,
  sum(case when g.wins=0 then 1 else 0 end) as lost,
  sum(case sign(g.wins)
    when 1 then 3
    when 0 then 1
    else 0 end) as total_point,
  sum(g.GF) as GF,
  sum(g.GA)as GA,
  sum(g.GF)-sum(g.GA) as average
from
 (
  select 
    t.id, 
	l.match, 
	sum(case when t.id=l.team then 1 else -1 end) as wins,
	sum(case when t.id=l.team then 1 else 0 end) as GF,
	sum(case when t.id=l.team then 0 else 1 end) as GA
  from wd_teams t
  join wd_matches m on t.id in (m.home, m.away)
  join wd_timeline l on l.`match`=m.id and l.goal=1
  group by t.id, l.match
  )g
inner join wd_teams t on t.id=g.id
group by t.id, t.name) as zz
inner join
(select @row_num:=0) as r
order by zz.total_point desc,zz.average  desc
...
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