Oracle/IN, EXISTS 썸네일형 리스트형 IN, EXISTS Oracle Tip: Understand how NULLs affect IN and EXISTS On the surface, it may appear that the SQL clauses IN and EXISTS are interchangeable. However, they're quite different in how they handle NULL values and may give different results. The problem comes from the fact that, in an Oracle database, a NULL value means unknown, so any comparison or operation against a NULL value is also NULL, and any.. 더보기 이전 1 다음