Index - O
| October | Platform.Prelude |
| odd | Platform.Prelude |
| Oid | |
| 1 (Type/Class) | Pq |
| 2 (Data Constructor) | Pq |
| oid | |
| 1 (Function) | Hasql.Encoders, Codecs.Encoders.Value, Codecs.Encoders |
| 2 (Function) | Codecs.TypeInfo |
| oidToWord32 | Pq |
| oidvector | Codecs.TypeInfo |
| Ok | Hipq.Send |
| ok | Hipq.ResultDecoder |
| on | Platform.Prelude |
| oneBits | Platform.Prelude |
| onException | Platform.Prelude |
| onLibpqConnection | Hasql.Session, Core.Contexts.Session |
| Op | |
| 1 (Type/Class) | Platform.Prelude |
| 2 (Data Constructor) | Platform.Prelude |
| OpenPunctuation | Platform.Prelude |
| optional | Platform.Prelude |
| options | Pq |
| or | Platform.Prelude |
| Ord | Platform.Prelude |
| ord | Platform.Prelude |
| Ordering | Platform.Prelude |
| ordNub | Platform.Prelude |
| ordNubOn | Platform.Prelude |
| other | Hasql.Connection.Settings |
| OtherConnectionError | Hasql.Errors, Core.Errors |
| OtherError | Platform.Prelude |
| OtherLetter | Platform.Prelude |
| OtherNumber | Platform.Prelude |
| OtherPunctuation | Platform.Prelude |
| OtherSymbol | Platform.Prelude |
| otherwise | Platform.Prelude |
| Overflow | Platform.Prelude |