Information technology — Guidance for the use of database language SQL — Part 9: Online analytic processing (OLAP) capabilities (Guide/OLAP)

This document discusses the syntax and semantics for including online analytic processing (OLAP) capabilities
in SQL, as defined in ISO/IEC 9075-2.
It discusses the following features regarding OLAP capabilities of the SQL language:
— Feature T611, “Elementary OLAP operations”,
— Feature T612, “Advanced OLAP operations”,
— Feature T614, “NTILE function”,
— Feature T615, “LEAD and LAG functions”,
— Feature T616, “Null treatment option for LEAD and LAG functions”,
— Feature T617, “FIRST_VALUE and LAST_VALUE functions”,
— Feature T618, “NTH_VALUE function”,
— Feature T619, “Nested window functions”,
— Feature T620, “WINDOW clause: GROUPS option”,
— Feature T621, “Enhanced numeric functions”