Notes in Databases

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Status	Last Update	Fields
Published	03/25/2024	What sort of constraint guarantees that all entities in an entity set takes part in a relationship set?
Published	03/25/2024	Based on the given Entity Relationship Diagram, which of the following statements is true.A. A team may play in several tournaments. B. A tournam…
Published	03/25/2024	Which of the following options is the best one to take while converting the given ERD into a relational database?A. The Team ID migrates to the Tourna…
Published	03/25/2024	For the given relational schema, which of the following relational algebra statements is valid and answers the query: “Find the loan number of each bo…
Published	03/25/2024	For the given schema, which of the following options best describes the results of the query: ∏ID (ID FMAX(balance) (σbalance<100,000 (deposit…
Published	03/25/2024	A new relation called depositor_address is added to the given schema to store a multi-valued attribute ‘address’ of the depositors. An address consist…
Published	03/25/2024	Which SQL operator is closest to the ⟕ operator, and what would A ⟕ B return if B contains no rows?
Published	03/25/2024	Give an example of a composite attribute in a real-world data model?
Published	03/25/2024	What is a foreign-key relationship in a real-world data model?
Published	03/25/2024	How many rows and columns will the query SELECT * FROM orders WHERE ProductId = 'xt23341'; produce?
Published	03/25/2024	What is an insertion anomaly?
Published	03/25/2024	What is a deletion anomaly?
Published	03/25/2024	What is an updation anomaly?
Published	03/25/2024	What is a functional dependency?
Published	03/25/2024	What is the difference between full and partial functional dependency?
Published	03/25/2024	What is the difference between prime and non-prime attributes?
Published	03/25/2024	What is the first normal form? (1NF)
Published	03/25/2024	What is the second normal form? (2NF)
Published	03/25/2024	How can we make a 2NF table from one in the 1NF?
Published	03/25/2024	What is the third normal form? (3NF)
Published	03/25/2024	What is BCNF?
Published	03/25/2024	What does the projection operator \({\Pi}\) do?
Published	03/25/2024	What does the selection operator \({\sigma}\) do?
Published	03/25/2024	What does the aggregation operator do?
Published	03/25/2024	What is the cross product (join)?
Published	03/25/2024	What is the inner join (\({\Join} \))?
Published	03/25/2024	What is the natural join operator (\(*\))?
Published	03/25/2024	What is the union operator? \({\cup}\)
Published	03/25/2024	What is the intersection operator \({\cap}\)?
Published	03/25/2024	What is the difference operator \(-\)?
Status	Last Update	Fields