Which of the following statements is true about the ORDER BY clause in Oracle SQL?a)It is used to specify the columns to be retrieved from a tableb)It is used to filter data based on a specified conditionc)It is used to sort the result set in ascending or descending orderd)It is used to join multiple tables in a single queryCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Introduction:
The ORDER BY clause is a powerful feature in Oracle SQL that allows users to sort the result set of a query in ascending or descending order. It is commonly used to organize data in a meaningful way for analysis or presentation purposes.

Explanation:
The correct statement about the ORDER BY clause in Oracle SQL is option 'C': It is used to sort the result set in ascending or descending order.

Usage:
The ORDER BY clause is typically used at the end of a SELECT statement to specify the sorting order of the result set. It can be applied to one or more columns in the SELECT statement.

Sorting Order:
The ORDER BY clause supports sorting in both ascending (default) and descending order. By default, the result set is sorted in ascending order, but you can specify the DESC keyword to sort in descending order.

Sorting by Multiple Columns:
You can also sort the result set by multiple columns by specifying multiple column names separated by commas in the ORDER BY clause. The sorting is performed based on the order of the columns specified.

Example:
Let's consider a table called 'Employees' with columns such as 'EmployeeID,' 'FirstName,' and 'LastName.' To sort the result set in ascending order by the 'LastName' column, the following query can be used:

SELECT EmployeeID, FirstName, LastName
FROM Employees
ORDER BY LastName;

This query will retrieve the data from the 'Employees' table and sort it in ascending order based on the 'LastName' column.

Conclusion:
The ORDER BY clause in Oracle SQL is used to sort the result set in ascending or descending order. It is a powerful feature that allows for organized data presentation and analysis. By specifying one or more columns in the ORDER BY clause, you can control the sorting order of the result set.

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