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# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# random.txt: help text
# Copyright (C) 2001 Carlo Strozzi <carlos@linux.it>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# *********************************************************************
NoSQL operator: random
Pick one or more records at random from a table.
Usage: random [options]
Options:
--input (-i) 'file'
Read input from 'file' instead of STDIN.
--output (-o) 'file'
Write output to 'file' instead of STDOUT.
--help (-h)
Display this help text.
--no-header (-N)
Remove header from output.
--lines (-L) 'N'
Pick at most 'N' input records. By default only one
input record is printed.
--zero (-z)
By default at least one record is selected. This option
specifies that selecting no records is ok.
--key (-K)
Instead of printing complete records, just print their
first (leftmost) field, supposedly the record key.
This will save us a subsequent call to 'column' if all
we need is to extract the record keys.
Notes:
Not many tests have been done to assess how uniform is the random
selection of input records.
$Id$
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