What Is SQL guides beginners, experts, and intermediate readers through the most important aspects of declarative and procedural SQL. Knowledge gained includes the following: ? Designing, building, and querying relational databases in the latest versions of oracle and SQL server databases ? Performing data-quality operations that eliminate corrupted data from databases ? Extending the functionality of SQL using PL/SQL and programmable T-SQL ? Building and loading data warehouses without using an expensive ETL tool ? Troubleshooting and tuning SQL code and database designs ? Extensive use of built-in functions to retrieve and transform data ? Translating complex business rules into database constraints ? Creating advanced queries that answer complex business questions ? Manipulating data within tables ? Creating recoverable business transactions ? Perform nonstandard SQL operations such as deleting duplicate rows Obtain a free sample of oracle11i and SQL server 2012 databases.