Answer / lu

reference modification is
when you move the position of this field to another field
ex : move ws (3:5) to wss(6:5)
3:5 means 3thrd position and the lenght is 5 ....
2) union in sql used to check the column (row) of the table
A existing or not in table B...
3) GDG is the generation of sequential file, u access only
by sequential, VSAM (KSDS) access by key if you know, it's
more faster...
in endevor : unit test, Qa, and Production...

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