Most Job Interviews involves a set of common question asked by the interviewer to determine whether the candidate is outstanding in the job. It evaluates the skills and capability of an applicant, his/her wisdom and personality. It is the employer's way of assessing a prospective candidate.

What Is SQL?

SQL stands for Structured Query Language. It is a query language and used to perform operations on the database such as insert new records, update records, delete records and view records etc. SQL queries are performed on database like Oracle database, MySQL database, and SQL Server database etc. All database management system uses SQL as standard database language.

In this digital age, knowledge of SQL is very crucial. SQL is used to create, modify, retrieve and delete data in database. All big company’s uses DBMS to manage their data and hence knowledge about SQL plays a key important role to get a high paid job. This SQL interview questions will assist you to get acquainted with the types of question which you may encounter during an interview.

Most Common SQL Interview Questions

• What is SQL?
• What are the usages of SQL?
• What is a primary key?
• What is a foreign key?
• What is a unique key?
• What are the types of operators available in SQL?
• What is a join and how many different types of join in SQL?
• What is a constraint?
• What is Auto Increment?
• What is the unique Index?
• What is the difference between SQL and PL/SQL?
• What is the difference between BETWEEN and IN condition operators?
• What is the difference between DELETE and TRUNCATE statements in SQL?
• What is ACID property in a database?
• What is the difference between NULL value, zero and blank space?

You can find lots of websites on internet to learn more about common interview questions about SQL which will help you to prepare yourself for such kind of interview.