The DUAL table is a special one-row, one-column table present by default in Oracle and other database installations.
Firebird is an open source SQL relational database management system that "runs on Linux, Microsoft Windows, and several Unix platforms".
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The syntax of the SQL programming language is defined and maintained by ISO/IEC SC 32 as part of ISO/IEC 9075.
SQLf is a SQL extended with fuzzy set theory application for expressing flexible (fuzzy) queries to traditional (or ″Regular″) Relational Databases.
An SQL UPDATE statement changes the data of one or more records in a table.