On 6/28/17, Jeremy Zeiber <jzei...@gmail.com> wrote: > > According to https://sqlite.org/datatype3.html section 4.2, if one > operator in a comparison is TEXT and the other is INTEGER or no > affinity, then the TEXT operator is converted to NUMERIC. > > Could someone explain the varying results? What is it really doing? >
The affinity (TEXT, INTEGER, REAL, NUMERIC, BLOB) is determined by the declared type of the table column in which the value is stored. Since your example as no tables and no columns, all of the affinities are BLOB. No automatic conversions occur when comparing two values with an affinity of BLOB. Probably this seems very strange to someone who has grown up in the rigidly-typed world of old-school RDBMSes and programming languages taught at many universites. The conversion rules of SQLite may seem strange, but they are designed so that the same code that works on PostgreSQL will also work in the same way in SQLite, while still allowing flexible typing. If you just ignore all the rules, things generally work out the way you want. Most people never have to think about it - they just get the answer they were expecting. What unusual thing are you doing that requires you to become an expert on the arcane type-conversion rules of SQLite? -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
