Multiple column index question.

["Jan Muszynski" <jan@xxxxxxxxx>]

If I have an index that's composed of 2 columns:
    Index index1 on tableA (foo,bar)

and I then:
    Select cola, colb from tableA where foo=<value>

Will index1 still be used, or am I looking at a seqscan under all 
circumstances in this case?

TIA
-jan m