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MOVINGMAX Function
The MOVINGMAX function is a sequence function that returns the maximum of nonnull values
of a column in the current window of an intermediate result table ordered by a SEQUENCE BY
clause in a SELECT statement. See
MOVINGMAX is a Neoview SQL extension.
MOVINGMAX (column-expression,integer-expression [,max-rows])
column-expression
specifies a derived column determined by the evaluation of the column expression.
integer-expression
is an SQL numeric value expression of signed data type SMALLINT or INTEGER that specifies
the current window. The current window is defined as the current row and the previous
(integer-expression - 1) rows.
max-rows
is an SQL numeric value expression of signed data type SMALLINT or INTEGER that specifies
the maximum number of rows in the current window.
Note these considerations for the window size:
•
The actual value for the window size is the minimum of integer-expression and
max-rows.
•
If these conditions are met, MOVINGMAX returns the same result as RUNNINGMAX:
— The integer-expression is out of range, and max-rows is not specified. This
— The minimum of integer-expression and max-rows is out of range. In this
•
The number of rows is out of range if it is larger than the size of the result table, negative,
or NULL.
Example of MOVINGMAX
Return the maximum of nonnull values of a column in the current window of three rows:
SELECT MOVINGMAX (I1,3) AS MOVINGMAX3
FROM mining.seqfcn
SEQUENCE BY TS;
MOVINGMAX3
------------
6215
28174
28174
28174
11966
--- 5 row(s) selected.
370
SQL Functions and Expressions
condition includes the case in which both integer-expression and max-rows
are larger than the result table.
case, integer-expression could be within range, but max-rows might be the
minimum value of the two and be out of range (for example, a negative number).
"SEQUENCE BY Clause" (page
268).
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