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

   relational-schemas	Database.Custom.MySQL

   Aggregation function MIN.

2. negateMaybe :: (OperatorContext c, Num a) => Record c (Maybe a) -> Record c (Maybe a)

   relational-schemas	Database.Custom.MySQL

   Number negate uni-operator corresponding SQL -.

3. queryMaybe :: (MonadQualify ConfigureQuery m, MonadQuery m) => Relation () r -> m (Record Flat (Maybe r))

   relational-schemas	Database.Custom.MySQL

   Join sub-query. Query result is Maybe. The combinations of query and queryMaybe express inner joins, left outer joins, right outer joins, and full outer joins. Here is an example of a right outer join:

   outerJoin = relation $ do
   e <- queryMaybe employee
   d <- query department
   on $ e ?! E.deptId' .=. just (d ! D.deptId')
   return $ (,) |$| e |*| d
   

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

   relational-schemas	Database.Custom.MySQL

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

5. showNumMaybe :: (SqlContext c, Num a, IsString b) => Record c (Maybe a) -> Record c (Maybe b)

   relational-schemas	Database.Custom.MySQL

   Unsafely show number into string-like type in records.

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

   relational-schemas	Database.Custom.MySQL

   Aggregation function SUM.

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

   relational-schemas	Database.Custom.MySQL

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

8. class ProjectableFlattenMaybe a b

   relational-schemas	Database.Custom.Oracle

   Interface to compose phantom Maybe nested type.

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

   relational-schemas	Database.Custom.Oracle

   Interface to control Maybe of phantom type in records.

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

    relational-schemas	Database.Custom.Oracle

    Aggregation function AVG.

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