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What information is available from a relational database containing one relation with the attributes Name, Employee identification number, and Address that is not available from a database containing two relations, one with attributes Name and Address and the other with attributes Address and Employee identification number? Explain your answer.
Explain the differences between the storing data in Access and Excel. Why you would use a spreadsheet over the database?
Write SQL statements that do the following: Calculate the average salary for all employees. Calculate the maximum salaries for exempt and non-exempt employees.
To lock any other vertex, the transaction must have visited all the parents of that vertex and must be having a lock on one of the parents of the vertex. Show that the protocol ensures serializability and deadlock freedom.
Find the average number of books borrowed per member. Take into account that if a member does not borrow any books, then that member does not appear in the borrowed relation at all.
How and why did database management systems become the organizational data management standard? Describe some advantages of database approach over file-system approach.
Draw an Entity Relationship diagram for the system and Identify the table design for the database displaying all the fields/attributes. Ensure that all tables are in 3NF. You also need to identify the primary keys and foreign keys, where applicable..
Create a stored procedure that updates the members' balance in the membership table by correctly recording the current or outstanding balance for each customer.
Explain efficient algorithm that, provided edge-labeled graph G with distinguished vertex v0 and sequence s = σ1, σ2, ..., σk of characters from Σ, returns path in G which begins at v0.
A database at a college is required to support the following requirements. Complete the information-level design for this set of requirements. Determine any constraints you need that are not stated in the problem.
Examples for small n are given bellow, where a small square box represents an unsuccessful search. Prove that leaves of any binary search tree are located in the bottom two levels.
our current database uses dictionary-managed tablespaces. In running various performance tuning scripts, you have discovered that one of these tablespaces seems to have run out of space long before you calculated that it would.
Database designers stated following dimension of "miniworld"- to be represented in Company Supplier-Part database: company is organized into departments. Each department has unique name, unique number.
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