Opaleye.Internal.QueryArr

A parametrised Select. A SelectArr a b accepts an argument of type a.

SelectArr a b is analogous to a Haskell function a -> [b].

A SELECT, i.e. an SQL query which produces a collection of rows.

Select a is analogous to a Haskell value [a].

Implements LATERAL subqueries.

You might find it easier to use Opaleye.Lateral.laterally (if you want to apply aggregate, orderBy or limit to a SelectArr) or Opaleye.Lateral.bilaterally (if you want to apply union, intersect and except to two SelectArrs).

Convert an arrow argument into a function argument so that it can be applied inside do-notation rather than arrow notation.