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Fundamental of databases (2025-2026)

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Which

of the following is used to modify the data stored in the database?

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Which rule states: If X→Y, then XZ→YZ

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Data becomes _______ when

it is presented in a format that people can understand and use.

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Relation R(SSN, EmpName, DeptNo, DeptName, DeptLoc)

FDs:

  • SSN → EmpName, DeptNo

  • DeptNo → DeptName, DeptLoc

Primary Key = {SSN}

Which is correct?

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Supposed

we have a table Staffs containing the first and last name of all staffs in USTH.

Write a query to return find the official email of each person,  given that the domain is @usth.edu.vn and the

mail is of the following format: [email protected]

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What is the main performance benefit of using a stored procedure (SP) over repeatedly executing raw SQL statements?

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Meta data is _______.

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An entity type is

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Which

of the following is NOT a data type in SQL?

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