<https://processwire.com/talk/topic/858-sqlite-has-ftt-could-it-be-a-viable-alternative-database-backend-for-pw/page/2/#comment-189455>
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"There are two parts to this. Connection to a database and SQL features/parity in results. Connection to the db is abstracted through PDO and most things in processwire use the PDO powered database connection. In old code you might still find things calling to the old mysqli powered processwire class. \n \n\n\n\tThe part about sql features and their parity in implementation/results is another topic, which requires a good amount of knowledge of both databases. Actually PWs query engine isn't really using many fancy sql features, most stuff is just many joins + conditions, but I don't know sqlite well enough to evaluate if everything will be working there as well.\n "
<https://processwire.com/talk/topic/858-sqlite-has-ftt-could-it-be-a-viable-alternative-database-backend-for-pw/page/2/?tab=comments>