How to remove duplicate values from a table in SQL? Example

In the world of data management, duplicate values can be a persistent nuisance. Duplicate records not only clutter your database but can also lead to erroneous results and performance issues when querying or analyzing data. Fortunately, SQL provides a powerful set of tools for identifying and removing duplicate values from a table. In this comprehensive guide, we will explore various techniques and best practices for deduplicating your data using SQL.

What is Window Functions in SQL? Rank, Row_Number, and Dense_Rank? How to use it and Performance Analysis

T-SQL (Transact-SQL) window functions are a category of functions in Microsoft SQL Server that perform calculations across a specified range of rows related to the current row within a result set. These functions operate on a set of rows that are defined by an OVER clause in the query, allowing for more advanced and flexible analytical processing compared to traditional aggregate functions.

The 2024 Database Administrator RoadMap

As the digital realm continues to advance at a rapid pace, the role of a Database Administrator (DBA) becomes increasingly vital in ensuring the seamless management, security, and efficiency of data systems. This Database Administrator roadmap is tailored to equip both aspiring and seasoned DBAs with the knowledge, skills, and strategies needed to thrive in the dynamic world of database management in 2024. From fundamental concepts to emerging technologies, we will explore the key areas that define the modern database administration landscape. Whether you are seeking to enhance your existing expertise or embark on a new career path, this roadmap will be your trusted companion in mastering the latest tools, best practices, and industry trends shaping the field of database administration in 2024 and beyond.

2 Ways to remove duplicate rows in SQL? Example Tutorial

Hello guys, if you are wondering how to remove duplicate rows in SQL and looking for solutions on different databases like SQL Server, MySQL, and Oracle then you have come to the right place. In this article, I am going to share 2 ways to remove duplicate rows from SQL, first by using GROUP BY and HAVING clause and second by using the RANK function which works on most of the databases.  You can use any of the approaches to remove duplicates from tables using SQL. This is also one of the popular SQL Interview Questions so knowing how to solve this problem will also give you an edge on interviews. 

4 Examples of CASE expression in SQL

What is CASE and where is it used?
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.

Top 30 MySQL Interview Questions for 2 to 3 Years Experienced Developers

Hello guys, if you are preparing for MySQL interviews or you are preparing for a tech interviews where MySQL skills are needed and you are looking for MySQL questions then you have come to the right place. Earlier, I have shared 15 SQL queries from interviews and 30 Database Interview Questions and in this article, I am going to share 50+ MySQL questions which you can practice before interviews. These MySQL question touches many different topics on MySQL like Database and SQL related as well MySQL engine specific questions like MyISAM vs InnoDB etc.