Structured Query Language
A long standing, ubiquitous way of handling and packaging relational databases.
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Many DBMSs support the ISO standardized version of Structured Query Language (SQL). This is a language for querying and updating relational databases. Together with the data definition language, used to define and modify schemas, the contents of a database can be stored as a collection of schema and data statements.
The language rarely changes, but various modifications and additions may change along with software updates. When extensions are used, the documentation must show which SQL version has been used.
In SQL it is possible to refer to non-existent or external data without invalidating the file. If SQL is used for data exchange, any references must therefore be supplied, or each reference must be replaced by the data referred to.