ReSQL.ru
     
powered by simpleCommunicator - 2.0.61     © 2026 Programmizd 02
Мобильная версия    Контакт    Правила    FAQ    Помощь
Целевая тема:
Создать новую тему:
Автор:
Закрыть
Цитировать
Доб. в избранное | Игнор. тему | Прикреп. тему | Пометить прочит. / непрочит. | Фильтр
Форумы / MySQL [игнор отключен] [закрыт для гостей] / finding rownum from result
4 сообщений из 4, страница 1 из 1
finding rownum from result
    #38404924
Shahriyar.R
Скрыть профиль Поместить в игнор-лист Сообщения автора в теме
Shahriyar.R
Гость
Dear Experts i have previously emulated Oracle like rownum in MySQL it works correctly before but at moment:

Код: sql
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
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.
...
Рейтинг: 0 / 0
23.09.2013, 16:39:12
| Ответить | Цитировать | Написать  
finding rownum from result
    #38405017
Фотография javajdbc
Скрыть профиль Поместить в игнор-лист Сообщения автора в теме
javajdbc
Участник
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
1.
2.
3.
4.
5.
6.
7.
8.
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 :-)
...
Рейтинг: 0 / 0
23.09.2013, 17:42:20
| Ответить | Цитировать | Написать  
finding rownum from result
    #38405306
Shahriyar.R
Скрыть профиль Поместить в игнор-лист Сообщения автора в теме
Shahriyar.R
Гость
javajdbc,

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

Works like a charm:


Код: sql
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
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;
...
Рейтинг: 0 / 0
23.09.2013, 22:02:34
| Ответить | Цитировать | Написать  
finding rownum from result
    #38405323
Shahriyar.R
Скрыть профиль Поместить в игнор-лист Сообщения автора в теме
Shahriyar.R
Гость
Also rewrite this for using without "set @@row_num=0"

Код: sql
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
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
...
Рейтинг: 0 / 0
23.09.2013, 22:27:36
| Ответить | Цитировать | Написать  
4 сообщений из 4, страница 1 из 1
Форумы / MySQL [игнор отключен] [закрыт для гостей] / finding rownum from result
Найденые пользователи ...
Разблокировать пользователей ...
Читали тему (0):
Читали форум (0):
Пользователи онлайн (0):
Польз. соглашение   Полит. конфиден.  
NoSQL.ru       Кролег: Проекты, Новости, Чат       РЕД ФОРУМ       Фотоальбом: Участники, Встречи
Закрыть
start [/forum/topic.php?fid=47&msg=38405323&tid=1835998]:
 0ms
get settings:
 11ms
get forum list:
 13ms
check forum access:
 3ms
check topic access:
 3ms
track hit:
 42ms
get topic data:
 8ms
get forum data:
 2ms
get page messages:
 40ms
get tp. blocked users:
 2ms
others: 249ms
total:  373ms
созд. / загр.: 373ms
x
x
Закрыть


Просмотр
0 / 0
Close
Debug Console [Select Text]