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Top Forums Shell Programming and Scripting Select only top "N" records based on column value Post 302470306 by asandy1234 on Tuesday 9th of November 2010 05:36:12 PM
Old 11-09-2010
Quote:
Originally Posted by asandy1234
Again and again you are proving that you are a genius. I really appreciate your valueble contribution.

Thanks once again...
Hi radoulov,
I've one final query,in the logic to remove records whose count is more than 'n' based on column4 if I've to include one more column say column2 will the query change as count[$2,$4]++ < n ?

Thanks,
 

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Class::DBI::Query(3pm)					User Contributed Perl Documentation				    Class::DBI::Query(3pm)

NAME
Class::DBI::Query - Deprecated SQL manager for Class::DBI SYNOPSIS
my $sth = Class::DBI::Query ->new({ owner => $class, sqlname => $type, essential => @columns, where_columns => @where_cols, }) ->run($val); DESCRIPTION
This abstracts away many of the details of the Class::DBI underlying SQL mechanism. For the most part you probably don't want to be interfacing directly with this. The underlying mechanisms are not yet stable, and are subject to change at any time. OPTIONS
A Query can have many options set before executing. Most can either be passed as an option to new(), or set later if you are building the query up dynamically: owner The Class::DBI subclass that 'owns' this query. In the vast majority of cases a query will return objects - the owner is the class of which instances will be returned. sqlname This should be the name of a query set up using set_sql. where_clause This is the raw SQL that will substituted into the 'WHERE %s' in your query. If you have multiple %s's in your query then you should supply a listref of where_clauses. This SQL can include placeholders, which will be used when you call run(). essential When retrieving rows from the database that match the WHERE clause of the query, these are the columns that we fetch back and pre-load the resulting objects with. By default this is the Essential column group of the owner class. METHODS
where() $query->where($match, @columns); This will extend your 'WHERE' clause by adding a 'AND $column = ?' (or whatever $match is, isntead of "=") for each column passed. If you have multiple WHERE clauses this will extend the last one. perl v5.12.4 2004-04-25 Class::DBI::Query(3pm)
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