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BS ISO/IEC 19075-5:2021
Information technology. Guidance for the use of database language SQL Row pattern recognition (British Standard)
This document discusses the syntax and semantics for recognizing patterns in rows of a table, as defined in ISO/IEC 9075-2, commonly called “SQL/RPRâ€.
SQL/RPR defines two features regarding row pattern recognition:
— Feature R010, “Row pattern recognition: FROM clauseâ€
— Feature R020, “Row pattern recognition: WINDOW clauseâ€
These two features have considerable syntax and semantics in common, the principle difference being whether the syntax is placed in the FROM clause or in the WINDOW clause.
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