INSERT - Add a new record into the database table.
MODIFY - If record is available it modifies otherwise it wont modify.
UPDATE - If record is available its update the record otherwise it creates a new record.
Insert-used to insert the records Modify-used for alter the table field names Update-used for modify the data
Insert:Insert a set of new data's into database table.,
Update:Chance the existing data field in data base table.,
Modify:If the record is present then you how to Update the data's otherwise,Insert the new data.,
UPDATE - If record is available it modifies it.
MODIFY - If record is available it updates the record otherwise it creates a new record.
This means MODIFY can do the job for both UPDATE as well as INSERT.
-Rudresh