how expensive are null values?

From: Steffen Ramlow <s.ramlow_at_gmx.de>
Date: Mon, 21 Jan 2002 16:03:09 +0100
Message-ID: <a2hake$112tge$1@ID-54600.news.dfncis.de>

sample1:

id col1 col2

---

1 v11 v12

versus:

sample2:

id col1 col2

---

1  v11     null
1  null      v12

there maybe indexes on the tabel, at least in column id

where r the problems in sample2? Received on Mon Jan 21 2002 - 09:03:09 CST