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Multiple where in (select) slow


Multiple where in (select) slow

By : gege
Date : November 17 2020, 11:52 AM
With these it helps I know this might not be perfect, but what I ended up doing was to actually join the input into a string, and add that to the WHERE IN().
e.g. WHERE IN (3,4,5) etc.
code :


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SQL Server execute too slow for multiple select

SQL Server execute too slow for multiple select


By : alok tiwari
Date : March 29 2020, 07:55 AM
around this issue , Try with a join, it would looke like something like this:
code :
SELECT DISTINCT
   Country.CountryCode, 
   Country.CountryName, 
   Country.CountryEName, 
   Country.FirstShow, 
   Country.iseTicketFirstShow 
FROM 
   Tristar.dbo.COMCountry AS Country
   INNER JOIN eTicketSubAirport ON Country.CountryCode = eTicketSubAirport.CountryCode
   INNER JOIN eTicketMain       ON eTicketSubAirport.AirportCode = eTicketMain.eTDestinationAirport
WHERE 
  Country.ContinentName = 'Continent Name' 
  AND Country.iseTicket = 1 
  AND eTicketMain.eTChecked = 1 
  AND eTicketMain.eTDepartAirport = 'TPE'
ORDER BY 
   Country.iseTicketFirstShow DESC, 
   Country.FirstShow,
   Country.CountryEName
MySQL select with multiple many to many joins causing very slow query

MySQL select with multiple many to many joins causing very slow query


By : Guillaume Beauvois
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Using the following table structure: , Use post aggregation filtering if you want all property_id
code :
SELECT item.field
FROM items
INNER JOIN item_properties AS ip1 ON ip1.item_id=item.item_id and  
and ip1.property_id IN(3,4,5,6)
WHERE item.something_else='words'
GROUP BY item.field
HAVING COUNT(DISTINCT property_id )=4
Django select 2 multiple select slow load

Django select 2 multiple select slow load


By : jaryy
Date : March 29 2020, 07:55 AM
should help you out It takes a long time to load be cause you preload all options of your select2 input. I would suggest you to use select2 through django-autocomplete-light to avoid this issue. It will provide you tools to setup an autocomplete system and load matching options while typing text on your select2 input. Moreover, results paginated so that they are loaded as you scroll the select2 dropdown.
Basically you will have an autocomplete view:
code :
from dal import autocomplete

from your_app.models import Student


class Status1StudentsAutocomplete(autocomplete.Select2QuerySetView):
    def get_queryset(self):
        qs = Student.objects.filter(student_status_id=1)
        if self.q:  # self.q is the user-typed query
            qs = qs.filter(name__istartswith=self.q)
        return qs
from your_app.views import Status1StudentsAutocomplete

urlpatterns = [
    url(
        r'^autocomplete/students/status-1/$',
        Status1StudentsAutocomplete.as_view(),
        name='students_status1_autocomplete',
    ),
]
from dal import autocomplete

from django import forms


class SomeForm(forms.Form):
    student = forms.ModelChoiceField(
        queryset=Student.objects.filter(student_status_id=1),
        widget=autocomplete.ModelSelect2(url='student_status1_autocomplete')
    )
{% extend "your_layout.html" %}
{% block extrahead %} {# assuming extrahead block is within the <head> element #}
    {{ block.super }}
    {{ form.media }}
{% endblock %}

{% block content %} {# assuming you have a content block within your <body> element #}
    <form method="POST">
        {% csrf_token %}
        {{ form }}
        <button type="submit">Go!</button>
    </form>
{% endblock %}
multiple Bootstrap-select loads very slow

multiple Bootstrap-select loads very slow


By : geordibbk
Date : March 29 2020, 07:55 AM
it helps some times I was working with bootstrap select too. This trick solved my problems about bootstrap-select rendering delays on page loading: it seems that on page load, dom element usually render before selectpicker, this is making the CSS "rescale" which cause an horrible effect.
Usually selectpicker takes 500ms for the first rendering, you can force the rendering after the element definition like following avoiding this delay like follow:
MYSQL - Select query with multiple OR conditions is Slow

MYSQL - Select query with multiple OR conditions is Slow


By : Random developer 123
Date : March 29 2020, 07:55 AM
seems to work fine It is difficult for MySQL to optimize conditions with an OR. You might be better trying:
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