SQL Interview Questions And Answers

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SQL Interview Questions And Answers

SQL (Structured Query Language) is a programming language used to manage and manipulate relational databases. It provides a standardized way to interact with databases, enabling users to perform various operations such as querying data, inserting, updating, and deleting records, creating and modifying database structures, and managing access control.

These questions cover some fundamental concepts of SQL, including data manipulation, querying, database design, and optimization. It’s advisable to have a good understanding of these concepts and be able to provide clear and concise explanations. Additionally, practicing SQL queries and familiarizing yourself with common functions and syntax can greatly enhance your preparation for SQL interviews.

What is SQL?

What is a Query in SQL?

How to write a SQL Query?

What is use of ORDER BY clause in SQL?

What is the use of WHERE Clause in SQL?

What is use of HAVING clause in SQL?

What is the main difference between WHERE clause and HAVING clause?

What is the difference between IN clause and EXISTS clause?

What are the important Aggregate Functions in SQL?

What are the different types of SQL Commands?

What are most used SQL commands?

What are the SQL Constraints?

What are the most commonly used constraints in SQL?

What are the most common data types of SQL?

What is the use of Raw Data type?

What are the Logical Operators in SQL?

What are the joins in SQL?

What is a use of Hash Join?

What is use of Nature Join?

How can you select unique records from a table?

How to create empty tables with the same structure as another table?

Which is the faster clause to use in SQL?

What are Triggers in SQL?

What is use of STUFF function?

What is the difference between SQL and SQL server?

Which TCP/IP port does SQL Server run?

What is the difference between SQL and MySQL?

What is the difference between DELETE and TRUNCATE commands in SQL?