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Top Forums UNIX for Dummies Questions & Answers Calculating changes in non-contiguous data Post 302149674 by Ygor on Thursday 6th of December 2007 10:50:36 PM
Old 12-06-2007
If using Oracle, then try the LAG analytic function. It provides access to more than one row of a table at the same time without a self join.
 

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DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)	User Contributed Perl Documentation	  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

NAME
DBIx::Class::Storage::DBI::Oracle::WhereJoins - Oracle joins in WHERE syntax support (instead of ANSI). PURPOSE
This module is used with Oracle < 9.0 due to lack of support for standard ANSI join syntax. SYNOPSIS
DBIx::Class should automagically detect Oracle and use this module with no work from you. DESCRIPTION
This class implements Oracle's WhereJoin support. Instead of: SELECT x FROM y JOIN z ON y.id = z.id It will write: SELECT x FROM y, z WHERE y.id = z.id It should properly support left joins, and right joins. Full outer joins are not possible due to the fact that Oracle requires the entire query be written to union the results of a left and right join, and by the time this module is called to create the where query and table definition part of the SQL query, it's already too late. METHODS
See DBIx::Class::SQLMaker::OracleJoins for implementation details. BUGS
Does not support full outer joins. Probably lots more. SEE ALSO
DBIx::Class::SQLMaker DBIx::Class::SQLMaker::OracleJoins DBIx::Class::Storage::DBI::Oracle::Generic DBIx::Class AUTHOR
Justin Wheeler "<jwheeler@datademons.com>" CONTRIBUTORS
David Jack Olrik "<djo@cpan.org>" LICENSE
This module is licensed under the same terms as Perl itself. perl v5.16.2 2012-08-16 DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)
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