Introduction: Coalesce Function in SQL is one of the most powerful functions that SQL offers, which simplifies the process of handling NULL values within queries. In this article, we will…
Introduction: In the realm of data management, maintaining clean and consistent data is of utmost importance. One common issue that arises is inconsistent naming conventions within tables. Fortunately, SQL provides…
The problem of finding top-performing ads is a popular SQL question in Data Science interviews. So, if you want to know how to solve this problem, this article is for…
It’s a comm interview question on how to find the second highest salary, second highest salary, or nth highest salary in SQL. In this article, we will provide four ways…
What are JOINS? Joins help retrieving data from two or more database tables. The tables are mutually related using primary and foreign keys. Types of joins Cross JOIN, INNER JOIN ,Outer…
What is Normalization? Normalization is a crucial database design technique used to improve data organization and eliminate anomalies like Insertion, Update, and Deletion Anomalies. By applying normalization rules, larger tables…
SQL questions for Data Analysts :Frequently Asked SQL Interview Questions and Answers for Freshers and Experienced 1. What is DBMS? A Database Management System (DBMS) is a program that controls…
What is SQL? SQL is a database language designed for the retrieval and management of data in a relational database. SQL is the standard language for database management. All the RDBMS…
You can use the ISNULL function in SQL to convert an empty string to a null DateTime value: Assuming you are using SQL Server, you can use the TRY_CONVERT() function…
Duplicate data can be a common problem in databases, and removing it is an important step in maintaining the quality of your data. In SQL, there are a few ways…