30 Lecture - ORDER BY Clause

  1. Home
  2. Courses
  3. Database Management System
  4. 30 Lecture

30 Lecture

CS403

Midterm & Final Term Short Notes

ORDER BY Clause

ORDER BY clause is a SQL statement used to sort data in ascending or descending order based on specific columns in the result set. It allows users to control the order in which data is displayed in the output. ORDER BY clause can be used in SELE


Important Mcq's
Midterm & Finalterm Prepration
Past papers included

Download PDF
  1. What is the purpose of the ORDER BY clause in SQL? A) To filter data based on specific criteria B) To group data based on specific columns C) To sort data in ascending or descending order D) To combine data from two or more tables Answer: C) To sort data in ascending or descending order Which keyword is used in the ORDER BY clause to sort data in descending order? A) DESC B) ASC C) ORDER D) BY Answer: A) DESC Can the ORDER BY clause be used with the SELECT statement? A) Yes B) No Answer: A) Yes Which clause comes after the ORDER BY clause in a SELECT statement? A) FROM B) WHERE C) GROUP BY D) HAVING Answer: LIMIT or OFFSET clauses, but if they're not used then the query ends after ORDER BY clause. What is the default sorting order used by ORDER BY clause in SQL? A) Descending order B) Ascending order C) No default sorting order D) Random order Answer: B) Ascending order Can multiple columns be used in the ORDER BY clause? A) Yes B) No Answer: A) Yes Which operator is used to separate multiple columns in the ORDER BY clause? A) AND B) OR C) COMMA D) COLON Answer: C) COMMA What is the use of the NULLS FIRST keyword in the ORDER BY clause? A) It sorts NULL values first in the result set. B) It sorts NULL values last in the result set. C) It is not a valid keyword in the ORDER BY clause. D) It has no effect on the sorting of NULL values. Answer: A) It sorts NULL values first in the result set. Can an alias name be used in the ORDER BY clause? A) Yes B) No Answer: A) Yes Can a subquery be used in the ORDER BY clause? A) Yes B) No Answer: B) No


Subjective Short Notes
Midterm & Finalterm Prepration
Past papers included

Download PDF

  1. What is the purpose of the ORDER BY clause in SQL? Answer: The ORDER BY clause is used to sort data in ascending or descending order based on specific columns in the result set. Can the ORDER BY clause be used with the SELECT statement? Answer: Yes, the ORDER BY clause can be used with the SELECT statement. How can you sort data in descending order using the ORDER BY clause? Answer: You can use the DESC keyword with the ORDER BY clause to sort data in descending order. Can you use multiple columns in the ORDER BY clause? Answer: Yes, you can use multiple columns in the ORDER BY clause to sort data based on multiple columns. What is the default sorting order used by the ORDER BY clause in SQL? Answer: The default sorting order used by the ORDER BY clause in SQL is ascending order. What is the purpose of the NULLS FIRST keyword in the ORDER BY clause? Answer: The NULLS FIRST keyword is used in the ORDER BY clause to sort NULL values first in the result set. Can you use an alias name in the ORDER BY clause? Answer: Yes, you can use an alias name in the ORDER BY clause to sort data based on the alias name. What is the difference between the ORDER BY clause and the GROUP BY clause? Answer: The ORDER BY clause is used to sort data in ascending or descending order, while the GROUP BY clause is used to group data based on specific columns. How can you sort data based on a column number instead of the column name in the ORDER BY clause? Answer: You can use the column number instead of the column name in the ORDER BY clause by specifying the column number after the SELECT keyword. Can you use a subquery in the ORDER BY clause? Answer: No, you cannot use a subquery in the ORDER BY clause.

ORDER BY Clause is an essential clause in SQL that is used to sort the retrieved data from a table in a specific order based on one or more columns. It enables the user to sort data in either ascending or descending order and also to sort data based on multiple columns. The clause can be used in the SELECT statement, and it's followed by the column name or column numbers. By default, the ORDER BY clause sorts data in ascending order. However, the user can sort data in descending order by using the DESC keyword along with the ORDER BY clause. The DESC keyword sorts the data in reverse order based on the specified column. The clause can also sort data based on multiple columns. In this case, the user specifies the columns in the ORDER BY clause separated by commas. The first column specified is used to sort the data, and in the case of a tie, the second column is used, and so on. One important aspect of the ORDER BY clause is that it can be used with aliases, which makes the clause more readable and understandable. The alias name can be used instead of the column name to sort the data based on the alias name. In addition, the clause can handle NULL values by using the NULLS FIRST or NULLS LAST keywords. The NULLS FIRST keyword sorts NULL values first in the result set, while the NULLS LAST keyword sorts NULL values last in the result set. It's important to note that the ORDER BY clause is not a filtering mechanism. It only sorts the data retrieved from the table based on specific criteria. If the user wants to filter the data based on specific criteria, they need to use the WHERE clause. In conclusion, the ORDER BY Clause is a fundamental clause in SQL that enables the user to sort the retrieved data from a table in a specific order based on one or more columns. It's essential for creating meaningful reports and presentations of data and for data analysis.

Course Lectures