If you delete a file by accident and want to get it back, where will you go?

what is Update read ?

What do you call a collection of records that have been arranged in a certain order?

How do you check whether a record in a database exists?

How many records does the file contain? How many fields are there per record? What problem would you encounter if you wanted to produce a listing by city? How would you solve this problem by altering the file structure? If you wanted to produce a listing of the file contents by last name, area code, city, state, or zip code, how would you alter the file structure? What data redundancies do you detect? How could those redundancies lead to different types of anomalies?

Please walk me through the three most popular methods for organizing my files and demonstrate each one.

It would be helpful if you could provide a suggestion to enhance the way a file is organized.