Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
The "comparison check" does not do this:
Compariong key of FIle1 with total records of FILE2 for a match and than reading second record of FILE2 and same process repeats.
You need to read about how a 2-file match/merge works (whether in Easytrieve or some other language).
Did you look up the A010 error in the documentation?
I want to know how does key comparision work as mentioned in JOB statement.
This is described in the documentation. We are not able to "teach" products/code here. If you find something in the documentation that is not clear, post what you found from the manual and your doubt. Someone should be able to clarify.