Always as SQL. Historically, SQL was a rename of SEQUEL [1], so there may be some people who say SQL as a word, but most people spell it. That's also how the SQL standard say to pronounce it, "S-Q-L".

But, for Microsoft's WinDbg, the correct pronunciation for those in the know is, "wind bag". [2]

[1] https://en.wikipedia.org/wiki/SQL#History

[2] https://learn.microsoft.com/en-us/windows-hardware/drivers/d...