| ReadCommitted | Database.PostgreSQL.Simple |
| ReadMode | Database.PostgreSQL.Simple.LargeObjects |
| ReadOnly | Database.PostgreSQL.Simple |
| ReadWrite | Database.PostgreSQL.Simple |
| ReadWriteMode | |
| 1 (Data Constructor) | Database.PostgreSQL.Simple.LargeObjects |
| 2 (Type/Class) | Database.PostgreSQL.Simple |
| readWriteMode | Database.PostgreSQL.Simple |
| Record | Database.PostgreSQL.Simple.BuiltinTypes |
| Refcursor | Database.PostgreSQL.Simple.BuiltinTypes |
| Regproc | Database.PostgreSQL.Simple.BuiltinTypes |
| RelativeSeek | Database.PostgreSQL.Simple.LargeObjects |
| Reltime | Database.PostgreSQL.Simple.BuiltinTypes |
| RepeatableRead | Database.PostgreSQL.Simple |
| result | Database.PostgreSQL.Simple.Internal |
| ResultError | Database.PostgreSQL.Simple.FromField, Database.PostgreSQL.Simple |
| returnError | Database.PostgreSQL.Simple.FromField |
| rollback | Database.PostgreSQL.Simple |
| Row | |
| 1 (Type/Class) | Database.PostgreSQL.Simple.Internal |
| 2 (Data Constructor) | Database.PostgreSQL.Simple.Internal |
| row | Database.PostgreSQL.Simple.Internal |
| RowParser | Database.PostgreSQL.Simple.Internal, Database.PostgreSQL.Simple.FromRow |
| rowresult | Database.PostgreSQL.Simple.Internal |
| RP | Database.PostgreSQL.Simple.Internal |