| unColumn | Opaleye.Internal.Column | 
| UnExpr | Opaleye.Internal.HaskellDB.PrimQuery | 
| Union |   | 
| 1 (Data Constructor) | Opaleye.Internal.PrimQuery | 
| 2 (Data Constructor) | Opaleye.Internal.Sql | 
| union | Opaleye.Binary, Opaleye | 
| UnionAll |   | 
| 1 (Data Constructor) | Opaleye.Internal.PrimQuery | 
| 2 (Data Constructor) | Opaleye.Internal.Sql | 
| unionAll | Opaleye.Binary, Opaleye | 
| unionAllExplicit | Opaleye.Binary, Opaleye | 
| unionExplicit | Opaleye.Binary, Opaleye | 
| Unit | Opaleye.Internal.PrimQuery | 
| unit |   | 
| 1 (Function) | Opaleye.Internal.PrimQuery | 
| 2 (Function) | Opaleye.Internal.Sql | 
| UnOp | Opaleye.Internal.HaskellDB.PrimQuery | 
| unOp | Opaleye.Internal.Column | 
| UnOpFun | Opaleye.Internal.HaskellDB.Sql.Default | 
| UnOpOther | Opaleye.Internal.HaskellDB.PrimQuery | 
| UnOpPostfix | Opaleye.Internal.HaskellDB.Sql.Default | 
| UnOpPrefix | Opaleye.Internal.HaskellDB.Sql.Default | 
| UnOpType | Opaleye.Internal.HaskellDB.Sql.Default | 
| Unpackspec |   | 
| 1 (Type/Class) | Opaleye.Internal.Unpackspec, Opaleye.Manipulation, Opaleye | 
| 2 (Data Constructor) | Opaleye.Internal.Unpackspec | 
| unpackspecColumn | Opaleye.Internal.Unpackspec | 
| unsafeCase_ | Opaleye.Internal.Column | 
| unsafeCast | Opaleye.Internal.Column, Opaleye.Column, Opaleye | 
| unsafeCoerce | Opaleye.Internal.Column, Opaleye.Column, Opaleye | 
| unsafeCoerceColumn | Opaleye.Internal.Column, Opaleye.Column, Opaleye | 
| unsafeCompositeField | Opaleye.Internal.Column, Opaleye.Column, Opaleye | 
| unsafeEq | Opaleye.Internal.Column | 
| unsafeGt | Opaleye.Internal.Column | 
| unsafeIfThenElse | Opaleye.Internal.Column | 
| unsafePgFormatTime |   | 
| 1 (Function) | Opaleye.Internal.PGTypes | 
| 2 (Function) | Opaleye.PGTypes, Opaleye | 
| UnsafeTag | Opaleye.Internal.Tag | 
| unsafeUnTag | Opaleye.Internal.Tag | 
| unZip | Opaleye.Internal.Table | 
| upper | Opaleye.Operators, Opaleye |