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Answer Posted / niki
FIND- to access one or multiple records using search
criteria .The FIND statement has several forms. The
essential ones are as follows:
• FIND
• FIND NUMBER
FIND and FIND NUMBER are completely different - FIND
retrieves data whereas FIND NUMBER queries the database.
A FIND statement has a processing loop associated with it.
READ- to access one or multiple records with different
keys even if elements of the key are unknown. It has
multiple forms as described below:
READ PHYSICAL - when all or most of the records in the file
are to be presented
(most efficient) when the sequence of records is not
important
when there is no risk of increasing record size during
update
READ BY ISN - when some or all of the records in the file
are to be presented
when the sequence of records is not important (or ISN
sequence is required)
when there is a risk of increasing record size during update
READ LOGICAL - when some or all of the records in the file
are to be presented
(least efficient) when only records within a specific key
range are to be presented
when the sequence of records presented is important
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