I WAS
Sunday, January 16, 2011
sql just learned
union
nullif
(e1, e2) if e1 ==2 return null else return e2
if
(expr, iftrue, iffalse)
[not]
exists
(query)
true if query returns rows
count
(expr) counts when expr is not null expression can be anything
No comments:
Post a Comment
Newer Post
Older Post
Home
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment