| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
Opaleye.Distinct
- distinct :: Default Distinctspec columns columns => Query columns -> Query columns
- distinctExplicit :: Distinctspec columns columns' -> Query columns -> Query columns'
Documentation
distinct :: Default Distinctspec columns columns => Query columns -> Query columns Source
Remove duplicate items from the query result.
Example type specialization:
distinct :: Query (Column a, Column b) -> Query (Column a, Column b)
Assuming the makeAdaptorAndInstance splice has been run for the product type Foo:
distinct :: Query (Foo (Column a) (Column b) (Column c)) -> Query (Foo (Column a) (Column b) (Column c))
distinctExplicit :: Distinctspec columns columns' -> Query columns -> Query columns' Source