Count - Paradedb — ContextQMD

The following query counts the number of values in a field:

<CodeGroup> ```sql SQL SELECT pdb.agg('{"value_count": {"field": "rating"}}') FROM mock_items WHERE id @@@ pdb.all(); ```

python

from paradedb import Agg, All, ParadeDB

MockItem.objects.filter(
    id=ParadeDB(All())
).aggregate(agg=Agg('{"value_count": {"field": "rating"}}'))

python

from sqlalchemy import select
from sqlalchemy.orm import Session
from paradedb.sqlalchemy import facets, pdb, search

stmt = (
    select(pdb.agg(facets.value_count(field="rating")))
    .select_from(MockItem)
    .where(search.all(MockItem.id))
)

with Session(engine) as session:
    session.execute(stmt).all()

ruby

MockItem.search(:id)
        .match_all
        .facets_agg(agg: ParadeDB::Aggregations.value_count(:rating))

</CodeGroup>

ini

       agg
-----------------
 {"value": 41.0}
(1 row)

See the Tantivy documentation for all available options.

SQL Count Syntax

SQL's COUNT syntax is supported in beta. To enable it, first run

sql

SET paradedb.enable_aggregate_custom_scan TO on;

With this feature enabled, the following query is equivalent to the above and is executed in the same way.

<CodeGroup> ```sql SQL SELECT COUNT(rating) FROM mock_items WHERE id @@@ pdb.all(); ```

python

from django.db.models import Count
from paradedb import All, ParadeDB

MockItem.objects.filter(
    id=ParadeDB(All())
).aggregate(count=Count('rating'))

python

from sqlalchemy import func, select
from sqlalchemy.orm import Session
from paradedb.sqlalchemy import search

stmt = (
    select(func.count(MockItem.rating))
    .select_from(MockItem)
    .where(search.all(MockItem.id))
)

with Session(engine) as session:
    session.execute(stmt).all()

ruby

MockItem.search(:id).match_all.count(:rating)

</CodeGroup>

To count all rows, including rows with null values, use COUNT(*):

<CodeGroup> ```sql SQL SELECT COUNT(*) FROM mock_items WHERE id @@@ pdb.all(); ```

python

from paradedb import All, ParadeDB

MockItem.objects.filter(id=ParadeDB(All())).count()

python

from sqlalchemy import func, select
from sqlalchemy.orm import Session
from paradedb.sqlalchemy import search

stmt = (
    select(func.count())
    .select_from(MockItem)
    .where(search.all(MockItem.id))
)

with Session(engine) as session:
    session.execute(stmt).all()

ruby

MockItem.search(:id).match_all.count

</CodeGroup>