How to Sort or Order results in SQL query? ORDER BY Example Tutorial

Ordering results in SQL is a fundamental aspect of retrieving and presenting data in a meaningful way. When querying a database, the order in which the results are displayed can significantly impact the user's understanding of the information. The SQL ORDER BY clause provides a powerful mechanism to sort query results based on one or more columns in ascending or descending order. Whether you are working with a small dataset or a large database, understanding how to order results allows you to tailor the presentation of information to meet specific requirements. 

How to find Nth Highest Salary of Employee in SQL? Example Tutorial

The Problem description

Finding the Nth highest salary of workers, where N might be 2, 3, 4, or anything, is one of the most typical SQL interview questions. This query is sometimes rephrased as "find the nth minimal wage in SQL." Many programmers struggle to design the SQL query when the Interviewer keeps asking for the 4th highest, 5th highest, and so on since they only know the easiest approach to address this problem, like by utilizing the SQL IN clause, which doesn't scale well. 

Difference between Correlated and Non-Correlated SubQuery in SQL

What is difference between correlated and non-correlated subquery in SQL?

A correlated subquery in SQL is a subquery that is dependent on the outer query. This means that the subquery relies on data from the outer query to provide a result. The subquery is executed for each row in the outer query and its result is used in the WHERE clause of the outer query. While, a non-correlated subquery, on the other hand, is independent of the outer query and is executed only once. The result of the subquery is stored in a temporary table, which is then used by the outer query.

How to use LEFT, RIGHT, INNER, OUTER, FULL, and SELF JOINs in SQL? Example Tutorial

What are joins and why are they required?

Hello, everyone. Have you ever faced any issues while generating reports or loading data but were using data of just one table was not enough? One table's data is typically insufficient to provide important insights when doing sophisticated analytical processing and data discovery, therefore merging numerous tables is required. SQL, as a method for communicating with relational databases, allows you to create relationships between tables

How do I perform an IF...THEN in an SQL SELECT?

Hey there! Today, I'm going to take you on a journey through the fascinating world of SQL, and we're going to dive headfirst into the intriguing realm of the IF...THEN statement within an SQL SELECT query. Don't fret; it's not as complicated as it sounds. So, grab your favorite coding beverage, settle in, and let's unravel this SQL mystery together.