The answer to the problem of SQL can be quickly located helping the DBA or developer optimize and tune the database for maximum efficiency. Easy lies the basic question in the topic filtering, sorting, operators, conditionals, pseudo columns, single row functions, joins, grouping functions, sub queries, composite queries, hierarchies, flashback queries, parallel queries, expressions and regular expressions. * Identify the most common issues DBAs face day to day for easy reference * Provides DBAs with solutions actually used by the authors in enterprise environments to resolve common problems and specific to the optimization problem. * Addresses issues that have been introduced by new features that can add more control but reduce performance.