Mainframe, MVS and zOS Discussion

"Real world" data tends to be messy and incomplete. A NULL indicates the data value is not known (there are many reasons this may happen). For example, if you're putting geneologic or demographic data into a database and there is a column NUMBER_OF_CHILDREN, there is a VAST difference bet...

There is one example in this post Can we capture JOBNAME through the COBOL program?. I am trying to do a similar approach in REXX. Doing my work will post back if I get something working.

nicc wrote:Null is nothing - not zero, not a space, not anything - NOTHING. If you do not supply a value or default value then the variable has no content as far as you are concerned. Therefore, as there is nothing to test against you need a NULL indicator.

I think I understand what you mean!

Hi,

What is the purpose of a null variable in real world? One of the document says, that when a value is not present it is NULL. What is the meaning of it? Can not a proper value showing what the column or row means will do the same thing for a programmer? Can someone please help inthis.

Hi,

Can anyone be of help. How can I access data which reside in control blocks, for example as jobname, in REXX? Are there some specific controls given in REXX for this or we need to write a series of commands for this? May I am confusing you but that's why I am asking.