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Full Discussion: mysql help : query with 2 conditionals
Top Forums Shell Programming and Scripting mysql help : query with 2 conditionals Post 302371981 by durden_tyler on Monday 16th of November 2009 09:22:12 PM
Old 11-16-2009
Code:
mysql>
mysql> select * from t;
+---------+------+---------+------------+
| server  | nic  | ip      | datestamp  |
+---------+------+---------+------------+
| server1 | BGE0 | 1.1.1.1 | 2009-06-10 |
| server1 | BGE0 | 1.1.2.1 | 2009-06-09 |
| server1 | BGE1 | 2.2.2.2 | 2009-06-10 |
| server2 | CE0  | 3.3.3.3 | 2009-04-06 |
| server1 | BGE1 | 2.2.2.1 | 2009-06-11 |
| server2 | CE0  | 3.3.3.1 | 2009-03-05 |
+---------+------+---------+------------+
6 rows in set (0.00 sec)

mysql>
mysql>
mysql> select * from t where (server, datestamp) in
    -> (select server, max(datestamp) from t group by server);
+---------+------+---------+------------+
| server  | nic  | ip      | datestamp  |
+---------+------+---------+------------+
| server2 | CE0  | 3.3.3.3 | 2009-04-06 |
| server1 | BGE1 | 2.2.2.1 | 2009-06-11 |
+---------+------+---------+------------+
2 rows in set (0.01 sec)

mysql>
mysql>

tyler_durden
 

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LEARN ABOUT DEBIAN

dbix::searchbuilder::handle::mysql

DBIx::SearchBuilder::Handle::mysql(3pm) 		User Contributed Perl Documentation		   DBIx::SearchBuilder::Handle::mysql(3pm)

NAME

	 DBIx::SearchBuilder::Handle::mysql - A mysql specific Handle object

SYNOPSIS

DESCRIPTION

       This module provides a subclass of DBIx::SearchBuilder::Handle that compensates for some of the idiosyncrasies of MySQL.

METHODS

   Insert
       Takes a table name as the first argument and assumes that the rest of the arguments are an array of key-value pairs to be inserted.

       If the insert succeeds, returns the id of the insert, otherwise, returns a Class::ReturnValue object with the error reported.

   SimpleUpdateFromSelect
       Customization of "SimpleUpdateFromSelect" in DBIx::SearchBuilder::Handle.  Mysql doesn't support update with subqueries when those fetch
       data from the table that is updated.

   DatabaseVersion
       Returns the mysql version, trimming off any -foo identifier

   CaseSensitive
       Returns undef, since mysql's searches are not case sensitive by default

   SimpleDateTimeFunctions
       Returns hash reference with specific date time functions of this database for "DateTimeFunction" in DBIx::SearchBuilder::Handle.

   ConvertTimezoneFunction
       Custom implementation of "ConvertTimezoneFunction" in DBIx::SearchBuilder::Handle.

       Use the following query to get list of timezones:

	   SELECT Name FROM mysql.time_zone_name;

       Read docs about keeping timezone data up to date:

	   http://dev.mysql.com/doc/refman/5.5/en/time-zone-upgrades.html

AUTHOR

       Jesse Vincent, jesse@fsck.com

SEE ALSO

       DBIx::SearchBuilder, DBIx::SearchBuilder::Handle

perl v5.14.2							    2011-09-21				   DBIx::SearchBuilder::Handle::mysql(3pm)
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