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1. sumMaybe :: (Num a, AggregatedContext ac, SqlContext ac) => Record Flat (Maybe a) -> Record ac (Maybe a)

   relational-query	Database.Relational.Arrow

   Aggregation function SUM.

2. uniqueQueryMaybe' :: UniqueRelation p c r -> QueryA QueryUnique () (PlaceHolders p, Record c (Maybe r))

   relational-query	Database.Relational.Arrow

   Same as uniqueQueryMaybe'. Arrow version. The result arrow is not injected by local projected records.

3. queryMaybe' :: MonadQuery m => Relation p r -> m (PlaceHolders p, Record Flat (Maybe r))

   relational-query	Database.Relational.Monad.Class

   Join sub-query with place-holder parameter p. Query result is Maybe.

4. class ProjectableFlattenMaybe a b

   relational-query	Database.Relational.Projectable

   Interface to compose phantom Maybe nested type.

5. class ProjectableMaybe (p :: Type -> Type)

   relational-query	Database.Relational.Projectable

   Interface to control Maybe of phantom type in records.

6. avgMaybe :: (Num a, Fractional b, AggregatedContext ac, SqlContext ac) => Record Flat (Maybe a) -> Record ac (Maybe b)

   relational-query	Database.Relational.Projectable

   Aggregation function AVG.

7. caseMaybe :: (OperatorContext c, PersistableWidth b) => Record c a -> [(Record c a, Record c (Maybe b))] -> Record c (Maybe b)

   relational-query	Database.Relational.Projectable

   Null default version of case'.

8. caseSearchMaybe :: (OperatorContext c, PersistableWidth a) => [(Predicate c, Record c (Maybe a))] -> Record c (Maybe a)

   relational-query	Database.Relational.Projectable

   Null default version of caseSearch.

9. flattenMaybe :: ProjectableMaybe p => p (Maybe (Maybe a)) -> p (Maybe a)

   relational-query	Database.Relational.Projectable

   Compose nested Maybe phantom type on record.

10. flattenPiMaybe :: (PersistableWidth a, ProjectableFlattenMaybe (Maybe b) c) => Record cont (Maybe a) -> Pi a b -> Record cont c

    relational-query	Database.Relational.Projectable

    Get narrower record with flatten leaf phantom Maybe types along with projection path.

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