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Lesson Navigation IconStructured Query Language SQL

Unit Navigation IconSQL overview

Unit Navigation IconCreation and modification of tables

Unit Navigation IconBasic database queries

Unit Navigation IconSQL Insert, Delete and Update

Unit Navigation IconUsage of SQL

Unit Navigation IconSummary

Unit Navigation IconRecommended Reading

Unit Navigation IconBibliography

Unit Navigation IconMetadata

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SQL stands for "Structured Query Language" and is a language to communicate with relational and object oriented databases. With SQL new tables (relations, schemes) can be created, altered, and deleted using the commands CREATE TABLE, ALTERTABLEand DROP TABLE. This part of SQL is also known as the Data Definition Language (DDL). More important in the daily use of SQL are the data query and manipulation (DML) commands. These commands allow you to INSERT, DELETE, and UPDATE values in the database. SQL is also used to control access restrictions to the database or to parts of it.

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