Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

SQL Insider Drilling Down on Queries Now that you understand the basic structure of a SQL application, let's dissect the basis of information retrieval: the query. By Anil Desai 02/01/2001 For ...

Drilling Down on Queries Now that you understand the basic structure of a SQL application, let's dissect the basis of information retrieval: the query. By Anil Desai 02/01/2001 For many techies, ...

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 ...

Structured Query Language (SQL) Basic SQL statements JOINs and aggregates Subqueries and combining selects Advanced queries Data modeling for relational databases Primary and foreign keys Table ...