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SQL (Structured Query Language) is a powerful language that is used by data analysts to interact with databases and manipulate data stored in them. As a data analyst, it is important to have a good understanding of SQL in order to perform various data analysis tasks efficiently and effectively. In this article, we will be discussing the “ORDER BY” clause in SQL.
The “ORDER BY” clause is used to sort the results of a SELECT statement. This means that you can choose to arrange the data in ascending or descending order based on one or more columns in the database table. By default, the “ORDER BY” clause sorts data in ascending order, but you can choose to sort the data in descending order by using the keyword “DESC”.
For example, let’s say you have a database table that contains information about employees in a company, including their names, job titles, and salaries. If you want to see a list of employees sorted by their salaries, you would use the following SQL statement:
SELECT * FROM employees ORDER BY salary;
This would return a list of employees with their names, job titles, and salaries, sorted in ascending order based on their salaries. If you wanted to sort the list in descending order, you would add the keyword “DESC” after the “ORDER BY” clause:
SELECT * FROM employees ORDER BY salary DESC;
This would return the same list of employees, but with the highest salaries appearing first and the lowest salaries appearing last.
It is also possible to sort the data based on multiple columns. For example, if you wanted to sort the employees by salary, but break ties by their names, you would use the following SQL statement:
SELECT * FROM employees ORDER BY salary, name;
This would return a list of employees sorted by their salaries, but if two employees have the same salary, their names would be used to break the tie.
In conclusion, the “ORDER BY” clause is a very useful tool for data analysts as it allows you to sort the results of a SELECT statement in the order that you want. Whether you want to sort data in ascending or descending order, or based on multiple columns, the “ORDER BY” clause makes it possible to achieve the desired results.
SQL for Beginners and Data Analyst – Chapter 8: ORDER BY
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