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SQL (Structured Query Language) is a query language for relational databases. The roots of SQL go back to SQUARE, a more mathematical oriented language and SEQUEL, a predecessor of SQL from the seventies. There exist different standards (ISO and ANSI) of SQL, but the most common one is SQL-92. The latest standard SQL-99 (or SQL3) even includes XML. In the following Units we will give a simple overview of the most important SQL functions.
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