Re: Cross Tab

In V6R1 there are now grouping extensions - like ROLLUP and CUBE - I've not used them, and the reference manual does not help me much yet - but this is intriguing

CUBE ( grouping-expression-list )
A CUBE grouping is an extension to the GROUP BY clause that produces a result set that contains all the rows of a ROLLUP aggregation and, in addition, contains ″cross-tabulation″ rows. Cross-tabulation rows are additional ″super-aggregate″ rows that are not part of an aggregation with sub-totals.

Charles Wilt wrote:

No, DB2 UDB for i5/OS doesn't have a cross-tab/pivot table function built in.

Web query is probably your best bet.

However, you can actually manually perform the cross-tab function
using the CASE statement.

Given:

Period Category Sales
2002-01 Snacks 3000.25
2002-01 Beverages 2145.01
2002-01 Fruit 175.20
2002-02 Snacks 2167.40
2002-02 Beverages 2022.39

Select Period,
Sum(Case When Category='Beverages'
Then SalesAmt End) As Beverages,
Sum(Case When Category='Fruit'
Then SalesAmt End) As Fruit,
Sum(Case When Category='Snacks'
Then SalesAmt End) As Snacks
From Sales
Group By Period
Order By Period

Gives you:
Period Beverages Fruit Snacks
2002-01 2145.01 175.20 3000.25
2002-02 2022.39 -- 2167.40



In addition, on the web you'll find various utilities developers have
written to automate this process so that you don't have to know ahead
of time how many columns you'll need.

Here's one, (from which I took the above example)
http://www.itjungle.com/mpo/mpo032703-story01.html

HTH,
Charles


On Thu, Dec 18, 2008 at 8:29 AM, Jerry Adams <Jerry@xxxxxxxxxxxxxxx> wrote:

My boss (the PC server guy) asked me if System i's SQL had a cross tab function. Never heard of it, but he said it was like a pivot table.

My searches in the SQL manuals, Info Center, and the srchives only turned up a reference in the IC to OLAP in Web Query for DB2.

Is there a cross tab function in SQL? We do have 5722-ST1 (DB2 Query Mgr and SQL DevKit) installed.

Thanks.

Jerry C. Adams
IBM System i Programmer/Analyst
B&W Wholesale
office: 615-995-7024
email: jerry@xxxxxxxxxxxxxxx

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