This has been a debate for as long as i've known.
How to pronounce SQL? ess-cue-el or sequel?
Each one has it's own supporters. But only one is correct.
And the winner is (drum-roll here):
S-Q-L (ess-cue-el)
And how can i be so sure about that?
It's ANSI declared.
Read more about SQL Pronounciation history here.
P.S.
Most people don't care. That's why it's trivia. :))