Test at Travis and AppVeyor with Postgres.


In SQLite/Postgres (non-MySQL) mode:

   Replace AUTO_INCREMENT columns with INTEGER PRIMARY KEY for SQLite or
   serial for Postgres.

   Remove CHARACTER SET, COLLATE and COMMENT from column definitions.

   Remove table options like ENGINE, AUTO_INCREMENT, CHARSET, etc:
   CREATE TABLE name (column_definitions) table_options;

   Remove LOCK/UNLOCK TABLES;