This category is all about SQL interview questions and answers on different SQL concepts such as SQL Functions, Triggers, Commands, comparison concepts like difference between union and union all and difference between unique key and primary key e.t.c.
In this category, we have captured all important SQL concepts with practical examples.
I am sure any beginner can easily understand these concepts.
If you are preparing for an interview, these questions and answers can really boost your knowledge.
Some of them are very frequently asked interview questions such as rank, dense rank, partition e.t.c and some of them are advanced topics.
🔍 SQL Subquery Generator Subqueries are essential when writing complex SQL queries — especially for filtering, aggregating, or comparing datasets within a single statement. With this free online SQL Subquery Generator, you can easily create nested SELECT queries for your WHERE, FROM, or SELECT clauses without writing everything manually. Perfect for beginners, students, analysts, and … Read more
Interactive SQL Runner & Formatter Tool Write, format, and execute SQL against a built‑in demo database. Ideal for testing queries immediately without a local database setup. Format SQL Run SQL Formatted SQL: Result Table:
SQL NULL Value Checker Tool Use this free SQL NULL Value Checker tool to quickly identify NULL values in your table columns. Ideal for debugging data quality issues and writing clean queries! Generate NULL Check SQL Generated SQL: How to Use: Enter your SQL table name followed by column names separated by commas. Click “Generate … Read more
This PL/SQL script checks whether a given number is a prime number using a simple loop and conditional logic. A must-know example for SQL developers and interview candidates. PL/SQL Code to Check Prime Number How It Works FAQs What is the best way to check primes in PL/SQL? Use loop up to square root for … Read more
PL/SQL Program to Reverse a Number Using While Loop This PL/SQL program demonstrates how to reverse a number using a WHILE loop. It is a common task in coding interviews and academic practice. PL/SQL Code to Reverse a Number DECLARE num NUMBER := 12345; reversed NUMBER := 0; rem NUMBER; BEGIN WHILE num > 0 … Read more
Best PL/SQL Grade Assignment Program with Loops and Case Learn how to write a PL/SQL program to assign grades using loops and CASE statements. This guide helps beginners and pros with real-world SQL interview questions and high-paying concepts. PL/SQL Code Example to Assign Grades DECLARE score NUMBER := 85; grade CHAR(1); BEGIN CASE WHEN score … Read more
Are you preparing for a Senior Data Analyst or SQL-based interview in top tech companies? Whether you’re applying for well-known firms in the US or global MNCs, the following SQL technical interview questions will give you hands-on insight into real-world queries asked during high-level analyst interviews. This post is based on an actual candidate’s experience … Read more
🧰 Tool: SQL Date Difference Calculator This tool calculates the difference between two dates in days, months, or years using SQL. It’s perfect for anyone working with HR data, subscriptions, billing periods, or age calculations in databases like MySQL, SQL Server, or Oracle. SQL Date Difference Calculator Start Date: End Date: Difference In: DaysMonthsYears Generate … Read more