{"title":"Feidhmeanna comhiomlánaithe sonracha PostgreSQL","version":"6.0","locale":"ga","docname":"ref/contrib/postgres/aggregates","url":"/ga/6.0/ref/contrib/postgres/aggregates/","canonical":"https://djangodocs.dev/ga/6.0/ref/contrib/postgres/aggregates/","summary":"Tá na feidhmeanna seo ar fáil ón modúl django.contrib.postgres.aggregates . < https://www.postgresql.org/docs/current/functions-aggregate.html >Déantar cur síos…","html":"

Feidhmeanna comhiomlánaithe sonracha PostgreSQLLink to this heading#

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Tá na feidhmeanna seo ar fáil ón modúl django.contrib.postgres.aggregates. < https://www.postgresql.org/docs/current/functions-aggregate.html>Déantar cur síos níos mionsonraithe orthu sna doiciméid PostgreSQL.

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Feidhmeanna comhiomlánchuspóireachLink to this heading#

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ArrayagLink to this heading#

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\nclass ArrayAgg(expression, distinct=False, filter=None, default=None, order_by=(), **extra)Link to this definition#
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Tugann sé liosta luachanna, lena n-áirítear neamhaill, atá comhcheangailte i sraith, nó réamhshocraithe mura bhfuil aon luachanna ann.

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\ndistinctLink to this definition#
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Argóint boolean roghnach a chinneann an mbeidh luachanna eagar ar leith. Réamhshocraithe go False.

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Sreang roghnach d'ainm réimse (le réimír roghnach ” -" a léiríonn ord íslitheach) nó abairt (nó liosta teaghráin agus/nó nathanna) a shonraíonn ordú na n-eilimintí sa liosta torthaí.

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Samplaí:

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Code
from django.db.models import F\n\nArrayAgg("a_field", order_by="-some_field")\nArrayAgg("a_field", order_by=F("some_field").desc())\n
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BitandLink to this heading#

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\nclass BitAnd(expression, filter=None, default=None, **extra)Link to this definition#
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Filleann sé int de ghiotán AND de na luachanna ionchuir neamh-null go léir, nó default má tá na luachanna go léir neall.

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BitorLink to this heading#

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\nclass BitOr(expression, filter=None, default=None, **extra)Link to this definition#
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Filleann sé int den OR` bitwise de na luachanna ionchuir neamh-null go léir, nó default má tá na luachanna go léir niall.

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BitxorLink to this heading#

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\nclass BitXor(expression, filter=None, default=None, **extra)Link to this definition#
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Filleann sé int den XOR` bitwise de na luachanna ionchuir neamh-null go léir, nó default má tá na luachanna go léir niall. Éilíonn sé PostgreSQL 14 +.

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BoolandLink to this heading#

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\nclass BoolAnd(expression, filter=None, default=None, **extra)Link to this definition#
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Tugann sé True, má tá na luachanna ionchuir go léir fíor, default má tá na luachanna go léir null nó mura bhfuil aon luachanna ann, ar shlí eile False.

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Sampla úsáide:

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Code
class Comment(models.Model):\n    body = models.TextField()\n    published = models.BooleanField()\n    rank = models.IntegerField()\n
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Python console
>>> from django.db.models import Q\n>>> from django.contrib.postgres.aggregates import BoolAnd\n>>> Comment.objects.aggregate(booland=BoolAnd("published"))\n{'booland': False}\n>>> Comment.objects.aggregate(booland=BoolAnd(Q(rank__lt=100)))\n{'booland': True}\n
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BoolorLink to this heading#

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\nclass BoolOr(expression, filter=None, default=None, **extra)Link to this definition#
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Tugann sé True má tá luach ionchuir amháin ar a laghad fíor, default má tá na luachanna go léir niall nó mura bhfuil aon luachanna ann, ar shlí eile False.

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Sampla úsáide:

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Code
class Comment(models.Model):\n    body = models.TextField()\n    published = models.BooleanField()\n    rank = models.IntegerField()\n
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Python console
>>> from django.db.models import Q\n>>> from django.contrib.postgres.aggregates import BoolOr\n>>> Comment.objects.aggregate(boolor=BoolOr("published"))\n{'boolor': True}\n>>> Comment.objects.aggregate(boolor=BoolOr(Q(rank__gt=2)))\n{'boolor': False}\n
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JsonbagLink to this heading#

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\nclass JSONBAgg(expressions, distinct=False, filter=None, default=None, order_by=(), **extra)Link to this definition#
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Tugann na luachanna ionchuir ar ais mar shraith JSON, nó default mura bhfuil aon luachanna ann. <jsonfield.key>Is féidir leat an toradh a cheistiú ag baint úsáid:lookup: `eochair agus innéacs cuardaigh `.

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\ndistinctLink to this definition#
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Argóint boolean roghnach a chinneann an mbeidh luachanna eagar ar leith. Réamhshocraithe go False.

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\norder_byLink to this definition#
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Sreang roghnach d'ainm réimse (le réimír roghnach ” -" a léiríonn ord íslitheach) nó abairt (nó liosta teaghráin agus/nó nathanna) a shonraíonn ordú na n-eilimintí sa liosta torthaí.

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Examples are the same as for ArrayAgg.order_by.

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Sampla úsáide:

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Code
class Room(models.Model):\n    number = models.IntegerField(unique=True)\n\n\nclass HotelReservation(models.Model):\n    room = models.ForeignKey("Room", on_delete=models.CASCADE)\n    start = models.DateTimeField()\n    end = models.DateTimeField()\n    requirements = models.JSONField(blank=True, null=True)\n
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Python console
>>> from django.contrib.postgres.aggregates import JSONBAgg\n>>> Room.objects.annotate(\n...     requirements=JSONBAgg(\n...         "hotelreservation__requirements",\n...         order_by="-hotelreservation__start",\n...     )\n... ).filter(requirements__0__sea_view=True).values("number", "requirements")\n<QuerySet [{'number': 102, 'requirements': [\n    {'parking': False, 'sea_view': True, 'double_bed': False},\n    {'parking': True, 'double_bed': True}\n]}]>\n
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StringagLink to this heading#

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\nclass StringAgg(expression, delimiter, distinct=False, filter=None, default=None, order_by=())Link to this definition#
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Filleann sé na luachanna ionchuir atá comhcheangailte i sreang, scartha leis an teaghrán delimiter, nó default mura bhfuil aon luachanna ann.

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\ndelimiterLink to this definition#
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Required argument. A string, Value, or\nexpression representing the string for separating values. For example,\nValue(",").

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\ndistinctLink to this definition#
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Argóint roghnach boolean a chinneann an mbeidh luachanna comhtháite ar leith. Réamhshocraithe go False.

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\norder_byLink to this definition#
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Sreang roghnach d'ainm réimse (le réimír roghnach ” -" a léiríonn ord íslitheach) nó abairt (nó liosta teaghráin agus/nó nathanna) a shonraíonn ordú na n-eilimintí sa sreangán torthaí.

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Examples are the same as for ArrayAgg.order_by.

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Sampla úsáide:

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Code
class Publication(models.Model):\n    title = models.CharField(max_length=30)\n\n\nclass Article(models.Model):\n    headline = models.CharField(max_length=100)\n    publications = models.ManyToManyField(Publication)\n
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Python console
>>> article = Article.objects.create(headline="NASA uses Python")\n>>> article.publications.create(title="The Python Journal")\n<Publication: Publication object (1)>\n>>> article.publications.create(title="Science News")\n<Publication: Publication object (2)>\n>>> from django.contrib.postgres.aggregates import StringAgg\n>>> Article.objects.annotate(\n...     publication_names=StringAgg(\n...         "publications__title",\n...         delimiter=", ",\n...         order_by="publications__title",\n...     )\n... ).values("headline", "publication_names")\n<QuerySet [{\n    'headline': 'NASA uses Python', 'publication_names': 'Science News, The Python Journal'\n}]>\n
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Feidhmeanna comhiomlána leLink to this heading#

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y agus xLink to this heading#

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Is féidir leis na hargóintí y agus x do na feidhmeanna seo go léir a bheith ina ainm réimse nó abairt ar ais sonraí uimhriúla. Tá an dá cheann ag teastáil.

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CorrLink to this heading#

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\nclass Corr(y, x, filter=None, default=None)Link to this definition#
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Tugann an comhéifeacht comhghaoil ar ais mar snám, nó réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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CovarpopLink to this heading#

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\nclass CovarPop(y, x, sample=False, filter=None, default=None)Link to this definition#
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Tugann an comhathracht daonra ar ais mar snám, nó réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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Roghnach. De réir réamhshocraithe filleann Covarpop an coathraitheacht ghinearálta daonra. Mar sin féin, má tá sample=True, is é an luach tuairisceáin an coathraitheacht daonra samplach.

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RegraVGXLink to this heading#

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\nclass RegrAvgX(y, x, filter=None, default=None)Link to this definition#
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Tugann sé meán an athróg neamhspleách (sum (x) /N) ar ais mar snám`, nó ``réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegravgiLink to this heading#

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\nclass RegrAvgY(y, x, filter=None, default=None)Link to this definition#
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Tugann sé meán an athróg cleithiúnach (sum (y) /N) ar ais mar snám`, nó ``réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegrCountLink to this heading#

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\nclass RegrCount(y, x, filter=None)Link to this definition#
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Filleann sé ``int ``de líon na sraitheanna ionchuir nach bhfuil an dá abairt neall.

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RegRinterceptLink to this heading#

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\nclass RegrIntercept(y, x, filter=None, default=None)Link to this definition#
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Tugann sé an t-idirghabháil y den chothromóid líneach is lú atá oiriúnach cearnach arna chinneadh ag na péirí (x, y) mar snáth, nó réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegRr2Link to this heading#

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\nclass RegrR2(y, x, filter=None, default=None)Link to this definition#
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Tugann cearnóg an chomhéifeacht comhghaoil ar ais mar snám`, nó ``réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegrSlopeLink to this heading#

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\nclass RegrSlope(y, x, filter=None, default=None)Link to this definition#
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Tugann fána an chothromóid líneach is lú atá oiriúnach cearnach a chinneadh ag na péirí (x, y) mar snámh ``, nó ``réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegRsXXLink to this heading#

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\nclass RegrSXX(y, x, filter=None, default=None)Link to this definition#
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Tugann sum (x ^ 2) - suim (x) ^2/N (“suim na gcearnóga” den athróg neamhspleách) mar snám, nó réamhshocraithe` mura bhfuil aon sraitheanna meaitseála ann.

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RegrsXYLink to this heading#

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\nclass RegrSXY(y, x, filter=None, default=None)Link to this definition#
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Tuairisceáin suim (x*y) - suim (x) * suim (y) /N (“suim táirgí” d'athróg neamhspleách ag brath ar amanna) mar snám, nó réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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RegrsyyLink to this heading#

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\nclass RegrSYY(y, x, filter=None, default=None)Link to this definition#
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Tuairisceann sum (y ^ 2) - suim (y) ^2/N (“suim na gcearnóga” den athróg cleithiúnach) mar snám, nó réamhshocraithe mura bhfuil aon sraitheanna meaitseála ann.

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Samplaí úsáideLink to this heading#

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Úsáidfimid an tábla sampla seo:

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| FIELD1 | FIELD2 | FIELD3 |\n|--------|--------|--------|\n|    foo |      1 |     13 |\n|    bar |      2 | (null) |\n|   test |      3 |     13 |\n
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Seo roinnt samplaí de chuid de na feidhmeanna comhiomlánaithe ginearálchuspóireach:

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Python console
>>> TestModel.objects.aggregate(result=StringAgg("field1", delimiter=";"))\n{'result': 'foo;bar;test'}\n>>> TestModel.objects.aggregate(result=ArrayAgg("field2"))\n{'result': [1, 2, 3]}\n>>> TestModel.objects.aggregate(result=ArrayAgg("field1"))\n{'result': ['foo', 'bar', 'test']}\n
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Taispeánann an chéad sampla eile úsáid feidhmeanna comhiomlán staitistiúla. < https://en.wikipedia.org/wiki/Regression_analysis>Ní dhéanfar cur síos ar an mhatamaitic bhunúsach (is féidir leat léamh faoi seo, mar shampla, ag wikipedia):

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Python console
>>> TestModel.objects.aggregate(count=RegrCount(y="field3", x="field2"))\n{'count': 2}\n>>> TestModel.objects.aggregate(\n...     avgx=RegrAvgX(y="field3", x="field2"), avgy=RegrAvgY(y="field3", x="field2")\n... )\n{'avgx': 2, 'avgy': 13}\n
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