Hi Tom,
Thank you very much for the clarification.
Let me set an empty string validation, before passing it to position() from API.
Thank you once again.
Regards,
Dinesh
manojadinesh.blogspot.com
On 2 May 2013 19:19, "Tom Lane" <tgl@xxxxxxxxxxxxx> wrote:
dinesh kumar <dineshkumar02@xxxxxxxxx> writes:
> postgres=# select position('' in 'PostgreSQL'); *// position(Substring as
> an empty string) is returning 1.*
> position
> ----------
> 1
> (1 row)
This is correct according to the SQL standard:
<position _expression_> determines the first position, if any, at
which one string, S1, occurs within another, S2. If S1 is of length
zero, then it occurs at position 1 (one) for any value of S2. If S1
does not occur in S2, then zero is returned.
regards, tom lane
