Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

In this tutorial, we will step through installing PostgreSQL, connecting to the database, loading some data, and running a variety of SQL queries. To cap it all off, we’ll execute a query ...

PL/SQL stands for Procedural Language extension of SQL. PL/SQL is a combination of SQL along with the procedural features of programming languages. It was developed by Oracle Corporation in the early ...

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Assuring optimal performance of database applications starts with coding properly formulated SQL. Poorly written SQL and application code is the cause of most performance problems. As much as 75% of ...

Learn how Data Transformation Services (DTS) can help you import, export, and/or transform data from various sources to single or multiple locations in Microsoft SQL Server 2000.

The SQL Developer unit testing framework involves a set of sequential steps for each test case. The steps are as follows, including the user input for before the step is run and the framework ...