![]() ![]() Specifies that the window starts or ends at the current row when used with ROWS or the current value when used with RANGE. UNBOUNDED PRECEDING can only be specified as a window starting point. Specifies that the window starts at the first row of the partition. For example, ROWS BETWEEN 2 PRECEDING AND CURRENT ROW means that the window of rows that the function operates on is three rows in size, starting with 2 rows preceding until and including the current row. " includes all rows that have the same values in the ORDER BY expression as the current row. Preceding and following rows are defined based on the ordering in the ORDER BY clause. Alternatively, the RANGE clause logically limits the rows within a partition by specifying a range of values to the value in the current row. The ROWS clause limits the rows within a partition by specifying a fixed number of rows preceding or following the current row. Physical association is achieved by using the ROWS clause. This is done by specifying a range of rows to the current row either by logical association or physical association. That is, it specifies the logical order in which the window function calculation is performed.įurther limits the rows within the partition by specifying start and endpoints within the partition. ![]() The window function is applied to each partition separately and computation restarts for each partition.ĭefines the logical order of the rows within each partition of the result set. The expression is to be evaluated for each row of the table.ĭivides the query result set into partitions. The table name that contains the rows for which the expression will be evaluated. The AVGW function calculates the AVERAGE value for each column across a set of table rows. The window functions perform calculations across a set of table rows that are somehow related to the current row.įollowing is the list of Window functions supported in Wyn Enterprise: ![]()
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