Question: 1) What is the relationship between: a- An entity and a record? b- An attribute and a field? c- An entity set and a file

1) What is the relationship between:

a- An entity and a record?

b- An attribute and a field?

c- An entity set and a file

2) What is the difference between a record type and an occurrence of that record? Give some examples

3) Name the four basic operations on stored data. In what important way is one in particular different from the other three?

4) What is sequential access? What is direct access? Which of the two is more important in todays business environment? Why?

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