Window Function
A window function in SQL:2003 is an aggregate function applied to a partition of the result set.
For example,
sum(population) OVER( PARTITION BY city )calculates the sum of the populations of all rows having the same city value as the current row.
Partitions are specified using the OVER clause which modifies the aggregate. Syntax:
The OVER clause can partition and order the result set. Ordering is used for order-relative functions such as row_number.
Read more about this topic: Select (SQL)
Famous quotes containing the words window and/or function:
“The minister’s wife looked out of the window at that moment, and seeing a man who was not sure that the Pope was Antichrist, emptied over his head a pot full of..., which shows to what lengths ladies are driven by religious zeal.”
—Voltaire [François Marie Arouet] (1694–1778)
“Think of the tools in a tool-box: there is a hammer, pliers, a saw, a screwdriver, a rule, a glue-pot, nails and screws.—The function of words are as diverse as the functions of these objects.”
—Ludwig Wittgenstein (1889–1951)