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Structured Query Language (SQL) is a database querying language. Code samples, table structure, sample data, and a tag for the DBMS implementation (e.g., MySQL, PostgreSQL, Oracle, MS SQL Server, IBM DB2, etc.) should be included in questions. If your inquiry is just about a particular DBMS (it uses specific extensions/features), use that DBMS's tag instead. SQL-tagged questions should be answered using ISO/IEC standard SQL.