In the end, multiple-choice questions are provided to test your understanding. We've divided this article into the following sections: It also covers practice problems to help you understand the basic concepts of SQL. Each question comes with a perfectly written answer inline, saving your interview preparation time. Here, you will find a collection of real-world Interview questions asked in companies like Google, Oracle, Amazon, and Microsoft, etc. This guide will help you to brush up on your SQL skills, regain your confidence and be job-ready! Differentiate between commit and checkpoint.Īre you preparing for your SQL developer interview?
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Does PostgreSQL support full text search? How will you take backup of the database in PostgreSQL? How do you perform case-insensitive searches using regular expressions in PostgreSQL? What is the main disadvantage of deleting data from an existing table using the DROP TABLE command? What can you tell about WAL (Write Ahead Logging)? How do you check the rows affected as part of previous transactions? What do you understand by command enable-debug? What do you understand by multi-version concurrency control? Can you explain the architecture of PostgreSQL? What are ACID properties? Is PostgreSQL compliant with ACID? How can you delete a database in PostgreSQL? How can you get a list of all databases in PostgreSQL? What is the capacity of a table in PostgreSQL? What is the importance of the TRUNCATE statement? What are partitioned tables called in PostgreSQL? How can we start, restart and stop the PostgreSQL server? What is the command used for creating a database in PostgreSQL? How will you change the datatype of a column?
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How to create empty tables with the same structure as another table? What is Collation? What are the different types of Collation Sensitivity? What are the differences between OLTP and OLAP? What is User-defined function? What are its various types? What is the difference between DELETE and TRUNCATE statements? What is the difference between DROP and TRUNCATE statements? What are the TRUNCATE, DELETE and DROP statements? What are the various forms of Normalization? List the different types of relationships in SQL. What are UNION, MINUS and INTERSECT commands? What are some common clauses used with SELECT query in SQL? What is the difference between Clustered and Non-clustered index? What is an Index? Explain its different types. What is a Join? List its different types.
What is the difference between SQL and MySQL? What is RDBMS? How is it different from DBMS?
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