SQL/MX 2.x Reference Manual (H06.04+)

SQL/MX Functions and Expressions

HP NonStop SQL/MX Reference Manual—540440-003

9-128

RUNNINGMAX Function

The RUNNINGMAX function is a sequence function that returns the maximum of

values of a column up to and including the current row of an intermediate result table

ordered by a SEQUENCE BY clause in a SELECT statement. See SEQUENCE BY

Clause on page 7-18.

RUNNINGMAX is an SQL/MX extension.

column-expression

specifies a derived column determined by the evaluation of the column expression.

RUNNINGMAX returns the maximum of values of column-expression up to

and including the current row.

Examples of RUNNINGMAX

Suppose that SEQFCN has been created as:

CREATE TABLE $db.mining.seqfcn

(I1 INTEGER,TS TIMESTAMP);

Within MXCI, the ANSI alias name has been mapped as:

CREATE SQLMP ALIAS db.mining.seqfcn $db.mining.seqfcn;

The table SEQFCN has columns I1 and TS with data that is sequenced by column TS:

RUNNINGMAX (column-expression)

I1 TS

6215 TIMESTAMP '1950-03-05 08:32:09'

28174 TIMESTAMP '1951-02-15 14:35:49'

19058 TIMESTAMP '1955-05-18 08:40:10'

4597 TIMESTAMP '1960-09-19 14:40:39'

11966 TIMESTAMP '1964-05-01 16:41:02'