> On May 22, 2019, at 3:55 PM, James K. Lowden <jklow...@schemamania.org> wrote: > > I've always thought user-defined types were unnecessary except as a > convenience.
User-defined types are quite important if you’re doing fancy stuff in user-defined functions, where data that’s stored in tables as blobs has an internal structure visible to those functions. (JSON is a good example, and the reason why SQLite added its ‘subtypes’ feature.) The biggest limitation with ‘subtypes’ is that they only exist during the execution of a query; they’re not visible in the final results. So when using the result of a query, one only sees a blob, with no indication what subtype of blob it is. In the project I work on, this has caused us some problems and required inelegant workarounds. —Jens _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
