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How to find the maximum value of a particular field inIMS-DB

 
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Susheel singh

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Joined: 25 Jul 2013
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PostPosted: Mon Mar 24, 2014 11:39 am    Post subject: How to find the maximum value of a particular field inIMS-DB
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Hi,

I want to know is there any function in IMS DB which can give a maximum value of particular field in a database.

Thanks in advance!
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Nic Clouston

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Joined: 10 May 2007
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PostPosted: Mon Mar 24, 2014 2:01 pm    Post subject: Reply to: How to find the maximum value of a particular fiel
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How do you mean "maximum value"? Actual maximum currently on the DB? Or the maximum possible value that the field can hold? Or something else?
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Susheel singh

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PostPosted: Mon Mar 24, 2014 2:39 pm    Post subject:
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suppose i have a date field in one segment , i want to get the highest date among all the records.
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enrico-sorichetti

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PostPosted: Mon Mar 24, 2014 2:46 pm    Post subject: Reply to: How to find the maximum value of a particular fiel
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do You realize that IMS knows nothing about the segments content/data ?
IMS has to be told only about the KEY related fields
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Susheel singh

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PostPosted: Mon Mar 24, 2014 5:21 pm    Post subject:
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i have a requirement that for some particular date field i need to get the maximum date among all the records in the database.

Anyone please suggest how can i achieve this...
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enrico-sorichetti

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PostPosted: Mon Mar 24, 2014 6:21 pm    Post subject: Reply to: How to find the maximum value of a particular fiel
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Quote:
Anyone please suggest how can i achieve this...

start coding....
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Anuj Dhawan

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PostPosted: Mon Mar 24, 2014 6:39 pm    Post subject:
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With that definition of your problem you look pretty far from what your destination!

In an effort to read between the lines -

  1. how's your date field defined? Is it in Julian or Gregorian format?
  2. "Maximum" is a relative term, with what the "value" should be maximum?
  3. With the information in hand I can think of two ways:
  • Use File-Aid for IMS and select the only field and look at the values.
  • As Enrico suggested write a program. Read the segment with date-filed. In output write the key for segment and the date-filed. And work with this output to get what you need.
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Nic Clouston

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PostPosted: Mon Mar 24, 2014 6:51 pm    Post subject: Reply to: How to find the maximum value of a particular fiel
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And what do you do if there is more than one record with that date?
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Rohit Umarjikar

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PostPosted: Wed Mar 26, 2014 7:57 am    Post subject:
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http://pic.dhe.ibm.com/infocenter/eiic/v1r1/index.jsp?topic=%2Fcom.ibm.ims10.doc.apg%2Fims_comparehierandreldbs.htm
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