Neoview SQL Reference Manual (R2.5)

MOVINGMIN Function
The MOVINGMIN function is a sequence function that returns the minimum 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 “SEQUENCE BY Clause” (page 326).
MOVINGMIN is a Neoview SQL extension.
MOVINGMIN (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, MOVINGMIN returns the same result as RUNNINGMIN:
— The integer-expression is out of range, and max-rows is not specified. This
condition includes the case in which both integer-expression and max-rows
are larger than the result table.
— The minimum of integer-expression and max-rows is out of range. In this
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).
• The number of rows is out of range if it is larger than the size of the result table, negative,
or NULL.
Example of MOVINGMIN
Return the minimum of nonnull values of a column in the current window of three rows:
SELECT MOVINGMIN (I1,3) AS MOVINGMIN3
FROM mining.seqfcn
SEQUENCE BY TS;
MOVINGMIN3
------------
6215
6215
6215
4597
4597
--- 5 row(s) selected.
428 SQL Functions and Expressions