Window functions in mysql are a little bit confusing and without trying them in the real-time examples, they are even more confusing! The RANK, DENSE_RANK and ROW_NUMBER functions are used to return the row numbers in the table; however, they all work totally differently. In this tutorial, we will see the overview of all functions …
In this tutorial, we will see detailed information about the LOCAL in the WITH CHECK OPTION clause. To understand the LOCAL concept, you must possess knowledge of the WITH CHECK OPTION clause. If you are not aware of the WITH CHECK OPTION clause, you can read and learn it here. Now, without further ado, let’s …
The words unique and distinct are used often used interchangeably in our daily life. But when it comes to SQL, it plays totally different roles. In this tutorial, we will see the difference between the UNIQUE and DISTINCT clauses in MySQL with some examples. So, let’s get started! Introduction Unique and distinct are synonyms for …
MySQL “Window Functions” is one of the important parts that many candidates skip and don’t prepare while appearing for interviews. It is a relatively simple topic if you understand it with simple explanations and examples. In this article, we will see some important and commonly asked interview questions on the window functions topic. So, let’s …
Preparing for SQL questions before any tech interview is as important as preparing for data structures and algorithms. For any tech role, such as software development engineer, data scientist, database administrator, etc, SQL is an important topic to be prepared with. There are multiple topics in MySQL that are important. The JOINs are supposed to …
An SQL JOIN and UNION both are used to combine the data from two or more tables having some relation. However, there is a difference between the JOIN and the UNION clause. In this tutorial, we will understand what are the similarities between them, the differences and when to use which clause. So, let’s get …
In a world where data is king, we need to choose applications and software for manipulating and maintaining our data. One such way is to use RDBMS or relational database management systems. In simple words, RDBMS is the collection of tables called a database. The database stores data in tabular format with additional information and …
PostgreSQL vs MySQL – Which Database Should You Choose? Read More »
SQL JOINs are often a good solution over the subqueries, but not every time. There might be chances join statement will not work faster where the subquery will and vice-versa. New learners get easily confused between the JOIN statement and the subqueries and which one to use. In this tutorial, we will see the differences …
MySQL is a popular relational database management system. It is open-source and is supported by operating systems such as macOS, Windows, Linux, etc. MySQL language makes it easy for users to create, maintain and manipulate databases. In this tutorial, we’ll learn how to install MySQL on a macOS machine. This is an easy-to-follow and step-by-step …
There are mainly two approaches to joining the tables, either using the names of multiple tables with the WHERE clause in the SELECT statement or using a JOIN statement. Which approach do you use often? In this tutorial, we will see both approaches with some examples and see why joins are preferred over the list …
Difference between JOIN and Multiple Tables in FROM Read More »