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From: Emi Lu <emilu@encs.concordia.ca>
To: pgsql-sql <pgsql-sql@postgresql.org>
Subject: isnumeric(varchar) by psql
Date: Wed, 27 Nov 2013 16:46:12 -0500
Message-ID: <52966824.8070404@encs.concordia.ca> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>

Hello,

Does psql provide a function isnumeric(varchar) to check if a varchar 
can be converted to a numeric field?

E.g.,
     x     | isnumeric
----------+-----------
           | f
  .        | f
  .0       | t
  0.       | t
  0        | t
  1        | t
  123      | t
  123.456  | t
  abc      | f
  1..2     | f
  1.2.3.4  | f
  1x234    | f
  1.234e-5 | t

Thanks a lot
Emi
--
Found examples users created by self. If psql provides similar one already?




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