Assigning Filenames

The ASSIGN clause in the SELECT clause is used to specify either a physical filename or a logical name which can be mapped to a physical name at run time.

There are three types of filename assignment:

• STATIC

  The filename is specified as a literal in the ASSIGN clause

• DYNAMIC

  The filename is specified as a data-item in the ASSIGN clause, and so can be changed by the program at run time

• EXTERNAL

  The filename is specified as EXTERNAL in the ASSIGN clause and is resolved at run time

Run-time mapping of filenames is available for all three types of filename assignment.