Very grateful indeed to those who have replied, but I confess to still being a little stuck.
I have an existing SQLite database (created outside B4A) with columns for various text, integer or whatever items, and I can now - thanks to various peoples' help! - display and manipulate them with no trouble in B4A; but if in addition one column contains a blob - a jpeg file - I'm not sure how to display that blob; I presume that I need an array with each blob (for each record) occupying one place in the array, but that's as far as I can get.
I realise that I'm really feeling my way here, so help is truly appreciated!
John