The values stored in array don’t vary. In the other hand, we can store the different values in same variables at various stages.
Dynamic select occurs whenever the program reads file. But access path occurs before the file is read (but not necessarily). Because access path maintenance performed on the file.
CAT – Concatenate two variables or constants into one continuous string. BCAT – Truncates all trailing blanks in the first character string, one blank is inserted, then the two character strings are concatenated. TCAT – Truncates all trailing blanks in the first character string, the two character strings are concatenated.