SQL is usually pronounced /ˈsēkwəl/
There is a historical reason for this!
"SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce in the early 1970s. This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasi-relational database management system, System R, which a group at IBM San Jose Research Laboratory had developed during the 1970s.
The acronym SEQUEL was later changed to SQL because "SEQUEL" was a trademark of the UK-based Hawker Siddeley aircraft company."
A strange thing how common unmodified words from language could be "trademarked"...
Apple, Windows, ... But they can, and there is a reason!
Trademark Registration of Common Words or Phrases
Apple Inc. had no problem trademarking the term APPLE for computers and computer programs. Why was this allowed? Because the word “apple” is an arbitrary word when used in connection with the manufacture and sale of computers and computer programs. That is, there is nothing about computers or computer programs that relates to apples. Accordingly, the term APPLE is actually a pretty strong trademark, as is the case when you apply a completely arbitrary term (however common it may be) to promote your products or services.