Oracle Database MCQs with answers Page - 2

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A

Arogya • 2.57K Points
Extraordinary

Q. Which query shows department name and employee name?

  • (A) Using join between EMPLOYEES and DEPARTMENTS
  • (B) Only EMPLOYEES table
  • (C) Only DEPARTMENTS table
  • (D) Using sequence

A

Arogya • 2.57K Points
Extraordinary

Q. Which SQL function converts employee name to uppercase?

  • (A) LOWER()
  • (B) UPPER()
  • (C) INITCAP()
  • (D) CAPITAL()

A

Arogya • 2.57K Points
Extraordinary

Q. Which function returns current system date?

  • (A) NOW()
  • (B) GETDATE()
  • (C) SYSDATE
  • (D) TODAY()

A

Arogya • 2.57K Points
Extraordinary

Q. Which clause limits number of rows returned?

  • (A) ROWNUM
  • (B) LIMIT
  • (C) TOP
  • (D) FETCH

A

Arogya • 2.57K Points
Extraordinary

Q. Which function handles NULL values?

  • (A) NVL()
  • (B) NULLIF()
  • (C) COALESCE()
  • (D) ISNULL()

A

Arogya • 2.57K Points
Extraordinary

Q. Which statement increases salary of all employees by 10%?

  • (A) UPDATE employees SET salary = salary + 10;
  • (B) UPDATE employees SET salary = salary * 1.10;
  • (C) INSERT salary + 10;
  • (D) ALTER salary;

A

Arogya • 2.57K Points
Extraordinary

Q. Which command removes all rows but keeps table structure?

  • (A) DELETE
  • (B) DROP
  • (C) TRUNCATE
  • (D) REMOVE

A

Arogya • 2.57K Points
Extraordinary

Q. Which subquery operator checks existence of rows?

  • (A) IN
  • (B) EXISTS
  • (C) ANY
  • (D) ALL

A

Arogya • 2.57K Points
Extraordinary

Q. Which index improves search performance on salary column?

  • (A) Unique index
  • (B) Normal index
  • (C) Bitmap index
  • (D) Foreign index

A

Arogya • 2.57K Points
Extraordinary

Q. Which clause groups employees by department?

  • (A) GROUP BY department_id
  • (B) ORDER BY department_id
  • (C) HAVING department_id
  • (D) WHERE department_id

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