03-07-2011
SQL - is it possible
I have a table with the following structure:
trxNo expiryDate remoteTrxNo
445455 2011-06-26 0
445455 2011-02-26 0
445999 2011-07-30 0
445999 2011-03-28 0
There are other columns that make the records unique but they are not relevant to my question, however, they are always in pairs.
I would like to update the remoteTrxNo in all the records in the table with the following logic:
If the expiryDate is the largest of the two possible values, write 'FAR' in the remotetrxNo column, when it is the smallest, write 'NEAR'.
Can this be done in a massive insert? Do I need to split the query in two to do the MAX once, and the MIN on the other update?
I've tried without success to write a query (or two) to accomplish this. I want to avoid writing code that will loop through a resultset one by one.
Any help would be appreciated.
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LEARN ABOUT OSX
net::dns::header
Net::DNS::Header(3) User Contributed Perl Documentation Net::DNS::Header(3)
NAME
Net::DNS::Header - DNS packet header
SYNOPSIS
use Net::DNS::Packet;
$packet = new Net::DNS::Packet;
$header = $packet->header;
DESCRIPTION
A "Net::DNS::Header" object represents the header portion of a DNS packet.
METHODS
new
$header = new Net::DNS::Header;
"new" creates a header object appropriate for making a DNS query.
decode
($header, $offset) = decode Net::DNS::Header($data);
Decodes the header record at the start of a DNS packet. The argument is a reference to the packet data.
Returns a Net::DNS::Header object and the offset of the next location in the packet.
Decoding is aborted if the header object cannot be created (e.g., corrupt or insufficient data).
encode
$data = $header->encode;
Returns the header data in binary format, appropriate for use in a DNS query packet.
print
$header->print;
Prints the header record on the standard output.
string
print $header->string;
Returns a string representation of the header object.
id
print "query id = ", $header->id, "
";
$header->id(1234);
Gets or sets the query identification number.
qr
print "query response flag = ", $header->qr, "
";
$header->qr(0);
Gets or sets the query response flag.
opcode
print "query opcode = ", $header->opcode, "
";
$header->opcode("UPDATE");
Gets or sets the query opcode (the purpose of the query).
aa
print "answer is ", $header->aa ? "" : "non-", "authoritative
";
$header->aa(0);
Gets or sets the authoritative answer flag.
tc
print "packet is ", $header->tc ? "" : "not ", "truncated
";
$header->tc(0);
Gets or sets the truncated packet flag.
rd
print "recursion was ", $header->rd ? "" : "not ", "desired
";
$header->rd(0);
Gets or sets the recursion desired flag.
cd
print "checking was ", $header->cd ? "not" : "", "desired
";
$header->cd(0);
Gets or sets the checking disabled flag.
ra
print "recursion is ", $header->ra ? "" : "not ", "available
";
$header->ra(0);
Gets or sets the recursion available flag.
ad
print "The result has ", $header->ad ? "" : "not", "been verified
"
Relevant in DNSSEC context.
(The AD bit is only set on answers where signatures have been cryptographically verified or the server is authoritative for the data and is
allowed to set the bit by policy.)
rcode
print "query response code = ", $header->rcode, "
";
$header->rcode("SERVFAIL");
Gets or sets the query response code (the status of the query).
qdcount, zocount
print "# of question records: ", $header->qdcount, "
";
$header->qdcount(2);
Gets or sets the number of records in the question section of the packet. In dynamic update packets, this field is known as "zocount" and
refers to the number of RRs in the zone section.
ancount, prcount
print "# of answer records: ", $header->ancount, "
";
$header->ancount(5);
Gets or sets the number of records in the answer section of the packet. In dynamic update packets, this field is known as "prcount" and
refers to the number of RRs in the prerequisite section.
nscount, upcount
print "# of authority records: ", $header->nscount, "
";
$header->nscount(2);
Gets or sets the number of records in the authority section of the packet. In dynamic update packets, this field is known as "upcount" and
refers to the number of RRs in the update section.
arcount, adcount
print "# of additional records: ", $header->arcount, "
";
$header->arcount(3);
Gets or sets the number of records in the additional section of the packet. In dynamic update packets, this field is known as "adcount".
COPYRIGHT
Copyright (c)1997-2002 Michael Fuhr.
Portions Copyright (c)2002-2004 Chris Reinhardt.
Portions Copyright (c)2007 Dick Franks.
All rights reserved.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, Net::DNS, Net::DNS::Packet, RFC 1035 Section 4.1.1
perl v5.16.2 2012-01-27 Net::DNS::Header(3)