Wow. I never realized it but the author's choice of a/an dictates how I read it in my head. Without even thinking about it, if I see "an SQL query" I read it as

Wow. I never realized it but the author's choice of a/an dictates how I read it in my head. Without even thinking about it, if I see "an SQL query" I read it as "an es-queue-ell query". If it's written as "a SQL query", then I read "a sequel query" But that doesn't answer your question. I suppose it's the same as when saying it. Pick one and stick with it, whatever your choice.