mysql - Get max and min values along with all values and multiple where clause -

-

i have query works good

  select cm.id ,cm.edited,cm.date_edited,cm.voteup,cm.votedown    chat_messages cm    timestampdiff(second,cm.date_edited,'$now') < 10 group cm.id

which gives me entries edited in less 10 seconds.

but along im trying max(voteup) , min(votedown)

but dont affect first entries of first query . how can combine entries need ?

example:

if im getting 3 newly updates entries . want them 3 plus max of voteup , votedown .

example:

    id   edited  date_edited          voteup    votedown     37      0      2016-03-05 22:13:03    5         0     38      0      2016-04-02 11:15:00    3         7     39      0      2016-03-05 22:10:06    10        6     40      0      2016-03-20 21:40:06    5         0     41      1      2016-04-20 22:28:59    5         0     42      1      2016-03-20 21:59:15    0         20     43      1      2016-04-21 22:20:25    8         0     <---- new updated

my wished result 

    id   edited  date_edited         voteup  votedown  maxup  maxdown     39      0      2016-03-05 22:10:06    10        6    10     null     42      1      2016-03-20 21:59:15    0         20   null   20     43      1      2016-04-21 22:20:25    8         0    null   null

my $now time 2016-04-21 22:20:20

explanation:

   -id 39 having maxup vote want     -id 42  having maxdown want     -id 43 newly updated in period of 10 seconds.

so general want new updated entries pls max , down .

if many max voteup values same choose 1 have min votedown

any solution pls ?

here my sqlfiddle example

edit: oh sorry meant id . wish question clear enter image description here

you want use union statement:

select * (     select cm.id ,cm.edited,cm.date_edited,cm.voteup,cm.votedown          , voteup maxup, null maxdown     chat_messages cm     order voteup desc, votedown     limit 1 ) union select * (     select cm.id ,cm.edited,cm.date_edited,cm.voteup,cm.votedown          , null maxup, votedown maxdown     chat_messages cm     order votedown desc, voteup     limit 1 ) b union select * (   select cm.id ,cm.edited,cm.date_edited,cm.voteup,cm.votedown          , null maxup, null maxdown   chat_messages cm   timestampdiff(second,cm.date_edited,'2016-04-21 22:20:20') < 10 ) c

note used '2016-04-21 22:20:20', want substitute $now in


Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more