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How to Use ROW_NUMBER OVER() in SQL

February 14, 2026

How to find if a foreign key exists

November 29, 2025

SQL interview questions with answers

November 26, 2025

Summary: in this tutorial, you will learn how to use the SQL WHERE clause to filter rows based on one or more conditions. Introduction to SQL WHERE clause To select specific rows from a table based on one or more conditions, you use the WHERE clause in the SELECT statement. Here’s the syntax of the WHERE clause: SELECT…

ijtaba March 10, 2026

SQL MY SQL Oracle PL/SQL

SQL FETCH

Summary: in this tutorial, you will learn how to use the SQL FETCH clause to limit the number of rows returned by a query. Introduction to SQL FETCH clause To limit the number of rows returned by a query, you use the LIMIT clause. The LIMIT clause is widely supported by many database systems such as…

ijtaba March 7, 2026

MY SQL Oracle PL/SQL SQL

What is SQL Server

SQL Server is a relational database management system (RDBMS) developed and marketed by Microsoft. Similar to other RDBMS software, SQL Server is built on top of SQL, a standard programming language for interacting with relational databases. SQL Server is tied to Transact-SQL, or T-SQL, Microsoft’s implementation of SQL, which includes a…

ijtaba March 3, 2026

MY SQL Oracle PL/SQL SQL

DENSE_RANK SQL

Problem We can easily use the MAX() function in SQL Server to find the maximum value in a table. However, there are situations when the second-highest or third-highest record is needed from the table. SQL Server has no direct SQL functions to fetch the second or third highest from the table, so…

ijtaba February 28, 2026

SQL MY SQL Oracle PL/SQL

RANK() Function in SQL

The RANK() function in SQL is a powerful window function in SQL Server used to assign a rank to each row within a result set. It is particularly useful when we need to assign a rank to a group of rows based on some sorting criteria and want to differentiate between rows…

ijtaba February 24, 2026

MY SQL Oracle PL/SQL SQL

SQL LEAD()

The LEAD() window function takes a column and an integer offset as arguments and returns the value of the cell in that column that is the specified number of rows after the current row. A third argument can be added to fill cells that do not have a corresponding row. Syntax LEAD(column1_name,…

ijtaba February 21, 2026

SQL

SQL interview questions with answers

SQL interview questions with answers Whether you’re preparing for a SQL Server interview or just want to sharpen your T-SQL skills, practical questions and hands-on SQL queries are the best way to learn. This article covers common and advanced SQL interview questions with answers that are often asked in technical interviews, complete…

ijtaba November 26, 2025

MY SQL Oracle PL/SQL SQL