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Hello guys, If you're preparing for SQL interviews or working on real-world reporting tasks, mastering window functions is no longer opt...

We often need to replace NULL values with empty String or blank in SQL e.g. while concatenating String. In SQL Server, when you concatenate...

What is the difference between char and varchar in SQL, followed by nchar and nvarchar , is one of the popular SQL interview questions , an...

Hello guys, if you are wondering how to find duplicate values in a table then don't worry, there are many ways to find duplicate rows or...

Hello Guys, you might have heard about how useful the EXISTS clause is helpful in writing sophisticated queries. Still, at the same time, I...

There are two kinds of OUTER joins in SQL, LEFT OUTER join and RIGHT OUTER join. The main difference between RIGHT OUTER joins and ...

Hello guys, if you are looking for SQL query examples from interviews or SQL Query Practice questions to improve your SQL skill or just to p...

One of the most common SQL interview questions is to find the Nth highest salary of employees, where N could be 2, 3, 4 or anything e.g. fi...

Hello guys, are you looking for a simple example of how to use SELF JOIN in SQL? If yes, then you have come to the right place. This arti...

Though all three are ranking functions in SQL, also known as a window function in Microsoft SQL Server, the difference between rank() , den...

It's tricky to use dates in the SQL server query, especially if you don't have good knowledge of how DateTime type works in the SQL...

How to find duplicate records in a table is a popular SQL interview questions which have been asked as many times as difference between tr...

How to find the second highest or second maximum salary of an Employee is one of the most frequently asked SQL interview questions similar...

Many times we need to create backup or copy of tables in databases like MySQL, Oracle, or PostgreSQL while modifying table schema like add...

One of the most common task while writing SQL queries or stored procedure is to find the length of String. Since most of the columns are VA...

Many times we need an SQL query that returns data page by page i.e. 30 or 40 records at a time, which can be specified as the page size. I...

In the SQL Server database, there are mainly two types of indexes, Clustered index, and the Non-Clustered index and difference between Clu...

The main difference between the Primary key and the Foreign key in a table is that it’s the same column that behaves as the primary key in...

Referential Integrity is a set of constraints applied to foreign keys which prevents entering a row in the child table (where you have the...

Hello guys, if you are preparing for SQL and Database Interviews or any Software engineering interview and looking for difference between T-...