Where does the practice “exists (select 1 from …)” come from?

Question

The overwhelming majority of people support my own view that there is no difference between the following statements:

SELECT * FROM tableA WHERE EXISTS (SELE         


        

Answer 1

This question has an answer that says it was some version of MS Access that actually did not ignore the field of the SELECT clause. I have done some Access development, and I have heard that SELECT 1 is best practice, so this seems very likely to me to be the source of the "myth."

Performance of SQL EXISTS usage variants