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/RPR'. SQL/RPR defines two features regarding row pattern recognition:
- Feature R010, 'Row pattern recognition: FROM clause'
- Feature R020, 'Row pattern recognition: WINDOW clause'
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.