Can I use… window clause

The window clause allows to centralize and reuse window definitions. It is the last clause of <table expression>—i.e. it follows the having clause if present.

 SELECT MIN(x) OVER window_name
      , MAX(x) OVER window_name
   FROM …
[ WHERE …    ]
[ GROUP BY … ]
[HAVING …    ]
 WINDOW window_name AS ([PARTITION BY …] [ORDER BY …] …) 

Both window functions, min and max, use the same window definition.

Related

• Other forms: over clause (inline), window … as (<existing window name> …)

• Product specific clause: qualify.

Normative References

The window clause is defined in ISO/IEC 9075:2016-2 as part of optional feature T612, “Advanced OLAP operations”.