Advanced SQL queries and functions MCQs in DBMS

MCQs on Advanced SQL Queries and Functions in DBMS

  1. Which SQL clause is used to restrict the rows returned by a query based on a specified condition?
    • a) SELECT
    • b) WHERE
    • c) FROM
    • d) GROUP BY

    Answer: b) WHERE

  2. What does the SQL function NVL(expr1, expr2) do?
    • a) Returns expr1 if it is not null, otherwise returns expr2.
    • b) Returns the sum of expr1 and expr2.
    • c) Returns true if expr1 equals expr2.
    • d) Returns expr1 if it is equal to expr2, otherwise null.

    Answer: a) Returns expr1 if it is not null, otherwise returns expr2.

  3. Which SQL function is used to remove leading and trailing spaces from a string?
    • a) SUBSTR
    • b) REPLACE
    • c) TRIM
    • d) INSTR

    Answer: c) TRIM

  4. What is the purpose of the HAVING clause in SQL?
    • a) To filter rows before the grouping operation.
    • b) To filter rows after the grouping operation.
    • c) To join two tables.
    • d) To sort the result set.

    Answer: b) To filter rows after the grouping operation.

  5. Which of the following SQL statements is used to retrieve unique values from a column?
    • a) SELECT DISTINCT column_name FROM table_name;
    • b) SELECT UNIQUE column_name FROM table_name;
    • c) SELECT DIFFERENT column_name FROM table_name;
    • d) SELECT DISTINCT * FROM table_name;

    Answer: a) SELECT DISTINCT column_name FROM table_name;

  6. What does the COALESCE function do in SQL?
    • a) Returns the first non-null value in the list.
    • b) Concatenates two strings.
    • c) Calculates the average of a list of numbers.
    • d) Replaces a substring within a string.

    Answer: a) Returns the first non-null value in the list.

  7. Which SQL function is used to count the number of rows in a table?
    • a) SUM
    • b) COUNT
    • c) AVG
    • d) MAX

    Answer: b) COUNT

  8. Which SQL keyword is used to combine the results of two queries, eliminating duplicate rows?
    • a) JOIN
    • b) UNION
    • c) INTERSECT
    • d) EXCEPT

    Answer: b) UNION

  9. What is the result of the following SQL query: SELECT MOD(15, 4)?
    • a) 3
    • b) 4
    • c) 2
    • d) 1

    Answer: a) 3

  10. Which SQL function is used to convert a string to uppercase?
    • a) LOWER
    • b) INITCAP
    • c) UPPER
    • d) LCASE

    Answer: c) UPPER

  11. What is the purpose of the CASE statement in SQL?
    • a) To perform conditional logic in SQL queries.
    • b) To join two tables.
    • c) To create a new table.
    • d) To update a table.

    Answer: a) To perform conditional logic in SQL queries.

  12. Which of the following SQL functions can be used to find the current date and time?
    • a) CURDATE()
    • b) GETDATE()
    • c) SYSDATE()
    • d) All of the above

    Answer: d) All of the above

  13. Which SQL clause is used to sort the result set?
    • a) ORDER BY
    • b) GROUP BY
    • c) SORT BY
    • d) ARRANGE BY

    Answer: a) ORDER BY

  14. Which SQL function returns the length of a string?
    • a) LENGTH
    • b) CHAR_LENGTH
    • c) LEN
    • d) All of the above

    Answer: d) All of the above

  15. What does the ROUND function do in SQL?
    • a) Truncates a number to the nearest integer.
    • b) Rounds a number to a specified number of decimal places.
    • c) Returns the square root of a number.
    • d) Returns the absolute value of a number.

    Answer: b) Rounds a number to a specified number of decimal places.

  16. What is the result of the following SQL query: SELECT CONCAT('SQL', ' ', 'Tutorial')?
    • a) ‘SQL Tutorial’
    • b) ‘SQLTutorial’
    • c) ‘SQL, Tutorial’
    • d) ‘SQL-Tutorial’

    Answer: a) ‘SQL Tutorial’

  17. Which of the following SQL clauses is used to combine rows from two or more tables based on a related column?
    • a) WHERE
    • b) JOIN
    • c) GROUP BY
    • d) ORDER BY

    Answer: b) JOIN

  18. Which SQL function is used to extract a substring from a string?
    • a) REPLACE
    • b) SUBSTRING or SUBSTR
    • c) TRIM
    • d) CONCAT

    Answer: b) SUBSTRING or SUBSTR

  19. What does the DATEDIFF function do in SQL?
    • a) Returns the difference between two date values.
    • b) Adds a specified number of days to a date.
    • c) Returns the current date.
    • d) Formats a date value.

    Answer: a) Returns the difference between two date values.

  20. Which SQL function is used to find the largest value in a column?
    • a) MAX
    • b) MIN
    • c) AVG
    • d) COUNT

    Answer: a) MAX

 

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