Migration from DB2 to PostgreSQL-ROLLUP()

While migrating my application from DB2 to PostgreSQL.

I want to migrate ROLLUP() function in PostgreSQL.

Example:
SELECT WEEK(SALES_DATE) AS WEEK,
DAYOFWEEK(SALES_DATE) AS DAY_WEEK,
SUM(SALES) AS UNITS_SOLD
FROM SALES
GROUP BY ROLLUP ( WEEK(SALES_DATE), DAYOFWEEK(SALES_DATE) )
ORDER BY WEEK, DAY_WEEK

This example shows two simple ROLLUP queries followed by a query which
treats the two ROLLUPs as grouping sets in a single result set and specifies
row ordering for each column involved in the grouping sets.

How can I migrate ROLLUP() function in PostgreSQL? or is there any similar
function in PostgreSQL which can done this job?

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