Question: 1 . What are primary and foreign keys? Explain in detail. What are the implications of using these keys in different tables? 2 . What

1 .

What are primary and foreign keys? Explain in detail. What are the implications of using these keys in different tables?

2 .

What is data dictionary? What is it used for?. What is the significance of creating a column in a table? What is the significance of a row in a table?

4 .

What is referential integrity and how is it used in relational databases for adding, removing and updating rows?

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