Re: Migration from DB2 to PostgreSQL-ROLLUP()

Hello

2013/6/19 sachin kotwal <kotsachin@gmail.com>:
> 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?

this functionality is not supported

you should to rewrite query

SELECT .. FROM GROUP BY weeks(sales_date), dayofweek(salesdate) UNION
ALL SELECT ... FROM .. GROUP BY dayofweek(salesdate) ORDER BY ..

Regards

Pavel Stehule

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