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Answer Posted / shikha
The CHAIN operation retrieves a record from a full
procedural file, sets a record identifying indicator on and
places the data from the record into the
input fields.If a file name is specified in name and access
is by key, the CHAIN operation retrieves the first record
that matches the search argument.
The READE operation retrieves the next sequential record
from a full procedural file if the key of the record
matches the search argument. If the key of the record does
not match the search argument, an EOF condition occurs, and
the record is not returned to
the program. If a READE operation is not successful, you
must reposition the file: for example,
using a CHAIN, SETGT, or SETLL operation.
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