Well... in spoken form, I'd match it to the way SQL is verbalized. But in written form you don't know in advance how the reader will verbalize / subvocalize it.

Well... in spoken form, I'd match it to the way SQL is verbalized. But in written form you don't know in advance how the reader will verbalize / subvocalize it. In that case, if I were writing something that included that phrase my vote would be to go with "an SQL query" on the basis that I usually verbalize it as "ess-queue-ell".