When a condition is met, the CASE statement evaluates different conditions and returns a scalar value. The phrase from the ELSE block will be returned if none of the conditions are evaluated to TRUE. The ELSE block, however, is optional. Above all, the CASE statement has two formats Simple CASE & Searched CASE.
The Searched CASE statement is highlighted in this post. To get the results, you'll need to use search and pattern matching.
Hello guys, If you want to learn about the difference between Equi and Non-Equi join in SQL then you have come to the right place. Earlier, I have shared the difference between LEFT and RIGHT join in SQL and now we will understand equi and non-equi join in SQL and database. The term "Non-Equi join" in SQL Server may sound abstract, but it's far from it. Equi joins are the same way. I think you'll agree with me after reading this essay. I'll attempt to explain what they are and when they should be used today. So, let's get this party started.
Hello guys, if you are wondering whether to choose a NoSQL database like MongoDB, Cassandara, or MySQL for your application then you have come to the right place. In an earlier article, MySQL vs PostgreSQL I had shared the pros and cons of choosing MySQL over PostgreSQL for your application, and in this article, I am going to show the benefits and drawbacks of choosing MySQL over NoSQL or vice-versa.
Hello guys, in the past, I gave you a quick overview of SQL JOINS where we learned about different types of JOINS like right, left, inner, and outer join, and in this article, we'll learn about the SQL CROSS JOIN idea in this post, and we'll back up our knowledge with simple examples and illustrations. So, let's start with the basics.
What are SQL commands?
SQL isn't a standard programming language in the sense that it doesn't require you to write a set of instructions in a specific order. Instead, SQL is a "declarative" language, which means that when you write a SQL query, you state what data you want to get as a result of the query but not how you'll get it.
The ROW NUMBER window function has a wide range of uses, much beyond the apparent ordering requirements. Most of the time, while computing row numbers, you need to do it in a specified order, which you provide in the function's window order clause.
After writing some SQL code, you're ready to query your database. You type in the code, and nothing happens. Instead, you're presented with an error notice.
Don't give up! SQL, like any other computer language, is prone to coding mistakes. We'll go through a few frequent mistakes individuals make while creating SQL in this 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.
