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Added note about check constraint [skip ci]

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Andrew Kane
2023-11-04 15:01:37 -07:00
parent 5d24f5d09a
commit 5986862bd2
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@@ -442,6 +442,12 @@ CREATE TABLE items (id bigserial PRIMARY KEY, embedding double precision[]);
INSERT INTO items (embedding) VALUES ('{1,2,3}'), ('{4,5,6}'); INSERT INTO items (embedding) VALUES ('{1,2,3}'), ('{4,5,6}');
``` ```
Optionally, add a [check constraint](https://www.postgresql.org/docs/current/ddl-constraints.html) to ensure data can be converted to the `vector` type and has the expected dimensions.
```sql
ALTER TABLE items ADD CHECK (vector_dims(embedding::vector) = 3);
```
Use [expression indexing](https://www.postgresql.org/docs/current/indexes-expressional.html) to index (at a lower precision): Use [expression indexing](https://www.postgresql.org/docs/current/indexes-expressional.html) to index (at a lower precision):
```sql ```sql