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

    relational-schemas Database.Custom.Oracle

    Number negate uni-operator corresponding SQL -.

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

    relational-schemas Database.Custom.Oracle

    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

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

    relational-schemas Database.Custom.Oracle

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

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

    relational-schemas Database.Custom.Oracle

    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-schemas Database.Custom.Oracle

    Aggregation function SUM.

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

    relational-schemas Database.Custom.Oracle

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

  7. class ProjectableFlattenMaybe a b

    relational-schemas Database.Custom.PostgreSQL

    Interface to compose phantom Maybe nested type.

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

    relational-schemas Database.Custom.PostgreSQL

    Interface to control Maybe of phantom type in records.

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

    relational-schemas Database.Custom.PostgreSQL

    Aggregation function AVG.

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

    relational-schemas Database.Custom.PostgreSQL

    Null default version of case'.

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