Database Languages

Database languages are special-purpose languages, which do one or more of the following:

·         Data definition language – defines data types such as creating, altering, or dropping and the relationships among them

·         Data manipulation language – performs tasks such as inserting, updating, or deleting data occurrences

·         Query language – allows searching for information and computing derived information

A database language may also incorporate features like:

·         DBMS-specific Configuration and storage engine management

·         Computations to modify query results, like counting, summing, averaging, sorting, grouping, and cross-referencing

·         Constraint enforcement (e.g. in an automotive database, only allowing one engine type per car)

·         Application programming interface version of the query language, for programmer convenience

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