---
title: Filters
description: Compute aggregations over multiple filters in one query
canonical: https://docs.paradedb.com/documentation/aggregates/bucket/filters
---

The filters aggregation allows a single query to return aggregations for multiple search queries at a time.
To use this aggregation, pass `pdb.agg` to the left-hand side of `FILTER` and a search query to the right-hand side.
For example:

<CodeGroup>
```sql SQL
SELECT
    pdb.agg('{"value_count": {"field": "id"}}')
    FILTER (WHERE category === 'electronics') AS electronics_count,
    pdb.agg('{"value_count": {"field": "id"}}')
    FILTER (WHERE category === 'footwear') AS footwear_count
FROM mock_items;
```

```python Django
from django.db.models import Q
from paradedb import Agg, ParadeDB, Term

MockItem.objects.aggregate(
    electronics_count=Agg(
        '{"value_count": {"field": "id"}}',
        filter=Q(category=ParadeDB(Term('electronics'))),
    ),
    footwear_count=Agg(
        '{"value_count": {"field": "id"}}',
        filter=Q(category=ParadeDB(Term('footwear'))),
    ),
)
```

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

stmt = select(
    pdb.agg(facets.value_count(field="id"))
    .filter(search.term(MockItem.category, "electronics"))
    .label("electronics_count"),
    pdb.agg(facets.value_count(field="id"))
    .filter(search.term(MockItem.category, "footwear"))
    .label("footwear_count"),
).select_from(MockItem)

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

```ruby Rails
result = MockItem.facets_agg(
  electronics_count: ParadeDB::Aggregations.filtered(
    ParadeDB::Aggregations.value_count(:id),
    field: :category,
    term: "electronics"
  ),
  footwear_count: ParadeDB::Aggregations.filtered(
    ParadeDB::Aggregations.value_count(:id),
    field: :category,
    term: "footwear"
  )
)
```

</CodeGroup>

<Note>
  Use lowercase `electronics` and `footwear`. The default BM25 tokenizer
  lowercases terms, so `Electronics` and `Footwear` would not match here.
</Note>

```ini Expected Response
 electronics_count | footwear_count
-------------------+----------------
 {"value": 5.0}    | {"value": 6.0}
(1 row)
```
