EQUALS option available in Unload datacard of BMC utility?

dsivapradeep · New User Joined: 06 Jul 2012 Posts: 43 Location: INDIA

Hi,

In unload datacard of BMC utility (PGM=ADUUMAIN), how to select only the first record out of multiple rows ?

For ex: primary key is (Branch + Account + Date). I want to retrive all the records of the table but only of latest date records for an unique (Branch + Account) combination. To get latest date i wrote ORDER BY branch asc, account asc, date desc.
But don't know how to select only the first record for a unique combination of Branch + Account.

Something like EQUALS option in DFSORT i was searching.

Any pointers on this would be helpful.

harithb · New User Joined: 08 Jun 2009 Posts: 15 Location: Bangalore

Hi,

Can you try combining your query with FETCH FIRST ROW ONLY and see if it works..

Cheers,
Haritha

Rohit Umarjikar · Posted: Tue Feb 04, 2014 5:39 am

Did you try with Group by and MAX combination? could you please provide sample data ?

sushanth bobby · Posted: Tue Feb 04, 2014 12:32 pm

Try something like this,

sandip_mainframe · New User Joined: 20 Sep 2006 Posts: 63 Location: pune

Hi,

You can use below query as FETCH FIRST ROWS clause works in BMC utility -

sushanth bobby · Posted: Tue Feb 04, 2014 12:51 pm

In BMC Unload if you give DIRECT NO, you can give all valid SELECT statements as they will be executed as dynamic queries.

sureshpathi10 · Posted: Tue Feb 04, 2014 12:52 pm

Sandip,
Your query will return only one record of any account number, which has smallest date.

But the requirement is to get all the account number's first records.

Sushanth query will work as expected.

dsivapradeep, have you tried ?

dsivapradeep · New User Joined: 06 Jul 2012 Posts: 43 Location: INDIA

Hey all,

Thanks for all your suggestions. I was not expecting any WHERE clauses in my UNLOAD DATACARD.

We're supposed to reduce DBA effort, so simple SELECT operation i'll be using

It's easy to get answer for my question using a WHERE clause but I was searching for some specific CONTROL PARAMETERs by avoiding WHERE clause.

I'll use a DFSORT step and removes extra records that came out of this unload file.

Sandip, I think your query may not give my desired output.

Rohit Umarjikar · Posted: Wed Feb 05, 2014 1:21 pm

If you could have mentioned this clearly in the question then someone could have given better solution and can save time as well.
however we are glad you found something useful.

Rohit Umarjikar · Posted: Wed Feb 05, 2014 1:45 pm

DIRECT YES: UNLOAD PLUS reads data directly from the table space data set or image copy data sets to unload the data, using a SELECT-like syntaxfor data selection. SELECT functionality is a limited subset of thefunctionality that is normally available in DB2 SQL. The benefit of the DIRECT YES mode is maximum performance when unloading large volumes of data.

DIRECT NO: UNLOAD PLUS processes the SELECT statement and reads the data usingDB2 dynamic SQL. This mode is not a high-performance solution for unloading large volumes of data. The benefit of the DIRECT NO mode is a full range of DB2 SQL SELECTfunctionality, including joined tables, subqueries, and so on. This functionality includes many of the features that are availablein UNLOAD PLUS including DB2 parallelism, data type conversions, output formatting

This might be helpful to you. If you have proper indexing then with above options and suggested query this should not be a performance issue. Let us know the volume of the underlying data here or MIPS which might get used in this process.