What's the fastest way to select the number of rows in a table? If I
use count(*) with no whereclause, it uses a seq_scan and takes 4 secs
(122k rows). With a where clause, it uses an index and returns in < 1
sec. Selecting count(requestnumber), which is an indexed column, with
no where clause again takes 4 secs. This latter version, I thought,
would use the index. The values of requestnumber are very distributed.
Thanks
