user-defined-data-types

问题 i am new to Haskell and probably missing something really basic here, but i am not able to re-use same value constructor among different data types. data Colour = Red | Pink | Orange | Yellow data Fruit = Apple | Orange | Banana This produces error saying Multiple declarations of ‘Orange’ Not sure why this isn't allowed, i have been using OCaml before learning Haskell and was able to define types like this 回答1: As a quick exercise try just defining one of your data types and then opening up

问题 i am new to Haskell and probably missing something really basic here, but i am not able to re-use same value constructor among different data types. data Colour = Red | Pink | Orange | Yellow data Fruit = Apple | Orange | Banana This produces error saying Multiple declarations of ‘Orange’ Not sure why this isn't allowed, i have been using OCaml before learning Haskell and was able to define types like this 回答1: As a quick exercise try just defining one of your data types and then opening up

问题 When using DUMP() or when using dbms_sql.define_column both return the CODE of the Oracle Data type. Is there a MAP that ties the Oracle Data Types to their Oracle CODEs that are returned by the DUMP() function or the dbms_sql.define_column feature? I'm looking for this to aid in testing as well as to locate custom data types such as a NESTED TABLE. A nested table exists in one of my tables and produces a Data Type Code of 109. How do I lookup the type that is associated with Type Code of 109