sql interview questions for 7 years experience

• Define database.
• What is DBMS and RDBMS? Explain the difference between them.
• What is SQL?
• What is normalization and its types?
• What is denormalization?
• What are Joins in SQL?
• Explain the types of SQL joins.
• What are the subsets of SQL?

RDBMS is one of the most commonly used databases to date, and therefore SQL skills are indispensable in most of the job roles. In this SQL Interview Questions article, I will introduce you to the most frequently asked questions on SQL (Structured Query Language). This article is the perfect guide for you to learn all the concepts related to SQL, Oracle, MS SQL Server, and MySQL database. Our Top 65 SQL Interview Questions article is the one-stop resource from where you can boost your interview preparation.

Top 65 SQL Interview Questions and Answers | SQL Interview Preparation | SQL Training | Edureka

Best SQL Server Interview Questions and Answers For 5 Years Experienced

Blocking happens when one connection from an application holds a lock and a second connection requires a conflicting lock type. This forces the second connection to wait, blocked on the first.

What are the steps you will take to improve the performance of a poor-performing query?

This is a very open-ended question and there could be a lot of reasons behind the poor performance of a query. But some general issues that you could talk about would be: No indexes, table scans, missing or out of date statistics, blocking, excess recompilations of stored procedures, procedures, and triggers without SET NOCOUNT ON, poorly written query with unnecessarily complicated joins, too much normalization, excess usage of cursors and temporary tables.

Some of the tools/ways that help you troubleshooting performance problems are:

Before you go! Take this “SQL Interview Questions” interview guide with you

Are you preparing for your SQL developer interview?

Then you have come to the right place.

This guide will help you to brush up on your SQL skills, regain your confidence and be job-ready!

Here, you will find a collection of real-world Interview questions asked in companies like Google, Oracle, Amazon, and Microsoft, etc. Each question comes with a perfectly written answer inline, saving your interview preparation time.

It also covers practice problems to help you understand the basic concepts of SQL.

Weve divided this article into the following sections:

In the end, multiple-choice questions are provided to test your understanding. Crack your next tech interview with confidence! Take a free mock interview, get instant⚡️ feedback and recommendation

A database is an organized collection of data, stored and retrieved digitally from a remote or local computer system. Databases can be vast and complex, and such databases are developed using fixed design and modeling approaches.

DBMS stands for Database Management System. DBMS is a system software responsible for the creation, retrieval, updation, and management of the database. It ensures that our data is consistent, organized, and is easily accessible by serving as an interface between the database and its end-users or application software.

You are being you being assigned a task to move 5 million rows from one server to another using T-SQL with a linked server. What will you consider to avoid transaction log fill up at destination server?

We will prefer to use SET ROWCOUNT and a while loop to commit data in batches.

FAQ

What are good SQL interview questions?

• Q1. What is normalization? What are the different normalizations?
• Q2. What is denormalization?
• Q3. What is collation? What are the different types of collation sensitivity?
• Q4. What do you understand about CASE statements?
• Q5. What are some common SQL commands?

How do I prepare for SQL interview?

1. Data Definition Language (DDL) keywords.
2. Data Manipulation Language (DML) keywords.
3. Data Control Language (DCL) keywords.
4. Transaction Control Language (TCL) keywords.
5. SQL constraints.
6. JOINs.
7. indexes.
8. transactions.

What are the 4 major commands in SQL?

• SELECT – extracts data from a database.
• UPDATE – updates data in a database.
• DELETE – deletes data from a database.
• INSERT INTO – inserts new data into a database.
• CREATE DATABASE – creates a new database.
• ALTER DATABASE – modifies a database.
• CREATE TABLE – creates a new table.

How can we select maximum salary in SQL?