select * from member where ( mb_leavedate='' or mb_leavedate is null ) order by id desc for orderby_num() between 0 and 25
위 쿼리와 아래 쿼리와의 시간차가 2초가 조금 넘게 차이가 납니다. 이유가 무엇이죠?
select * from member where mb_leavedate='' order by id desc for orderby_num() between 0 and 25