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

   relational-query	Database.Relational.Projectable

   Aggregation function MAX.

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

   relational-query	Database.Relational.Projectable

   Aggregation function MIN.

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

   relational-query	Database.Relational.Projectable

   Number negate uni-operator corresponding SQL -.

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

   relational-query	Database.Relational.Projectable

   Unsafely show number into string-like type in records.

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

   relational-query	Database.Relational.Projectable

   Aggregation function SUM.

6. flattenMaybe :: Record c (Maybe (Maybe a)) -> Record c (Maybe a)

   relational-query	Database.Relational.Record

   Composite nested Maybe on record phantom type.

7. piMaybe :: PersistableWidth a => Record c (Maybe a) -> Pi a b -> Record c (Maybe b)

   relational-query	Database.Relational.Record

   Trace projection path to get narrower Record. From Maybe type to Maybe type.

8. piMaybe' :: PersistableWidth a => Record c (Maybe a) -> Pi a (Maybe b) -> Record c (Maybe b)

   relational-query	Database.Relational.Record

   Trace projection path to get narrower Record. From Maybe type to Maybe type. Leaf type of projection path is Maybe.

9. unsafeStringSqlNotNullMaybe :: HasColumnConstraint NotNull r => Record c (Maybe r) -> StringSQL

   relational-query	Database.Relational.Record

   Unsafely get SQL string expression of not null key record.

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

    relational-query	Database.Relational.Relation

    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
    

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