What are the interview questions asked in SQL?

What are the interview questions asked in SQL?

SQL Interview Questions and Answers

• 2) When SQL appeared?
• 3) What are the usages of SQL?
• 4) Does SQL support programming language features?
• 5) What are the subsets of SQL?
• 6) What is the purpose of DDL Language?
• 7) What is the purpose of DML Language?
• 8) What is the purpose of DCL Language?

How do I practice SQL queries in interview?

Practical SQL Exercises for Interview

1. SQL Exercise 1 – Write a Statement.
2. SQL Exercise 2 – Write a Statement.
3. SQL Exercise 3 – Find the Error.
4. SQL Exercise 4 – Find the Result.
5. SQL Exercise 5 – Write a Query.
6. SQL Exercise 6 – Write a Date Query.
7. SQL Exercise 7 – Write a Query.
8. SQL Exercise 8 – Find and Delete Duplicates.

What are the 5 basic SQL commands?

There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL.

• Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc.
• Data Manipulation Language.
• Data Control Language.
• Transaction Control Language.
• Data Query Language.

What are basic SQL skills?

3. Basic SQL syntax. To understand any programming language, you must first master its syntax. In SQL, this means understanding how to construct a query to find relevant information.

How do you calculate top 3 salary in SQL?

1. TOP keyword SELECT TOP 1 salary FROM (SELECT TOP 3 salary FROM Table_Name ORDER BY salary DESC) AS Comp ORDER BY salary ASC.
2. limit SELECT salary FROM Table_Name ORDER BY salary DESC LIMIT 2, 1.
3. by subquery. SELECT salary FROM (SELECT salary FROM Table_Name ORDER BY salary DESC LIMIT 3) AS Comp ORDER BY salary LIMIT 1;

How do I find the third largest salary in SQL?

To Find the Third Highest Salary Using a Sub-Query,

1. SELECT TOP 1 SALARY.
2. FROM (
3. SELECT DISTINCT TOP 3 SALARY.
4. FROM tbl_Employees.
5. ORDER BY SALARY DESC.
6. ) RESULT.
7. ORDER BY SALARY.

How do I prepare for SQL assessment?

1. Practice SQL Queries

1. Hop on over to the SQL Practice course on LearnSQL.com.
2. Once you’ve got that under your belt, spend some time studying the type of SQL questions employers are likely to ask in your interview.
3. Another great place to get some SQL practice is w3resource.com.

Is semicolon necessary in SQL?

The semicolon (;) is used in SQL code as a statement terminator. For most SQL Server T-SQL statements it is not mandatory. Having said that, according to Microsoft documentation a semicolon will be required in future versions of SQL Server.

What is basic SQL query?

SQL, Structured Query Language, is a programming language designed to manage data stored in relational databases. SQL operates through simple, declarative statements. This keeps data accurate and secure, and it helps maintain the integrity of databases, regardless of size. Here’s an appendix of commonly used commands.

What are the SQL data types?

Data types in SQL Server are organized into the following categories:

• Exact numerics. Unicode character strings.
• Approximate numerics. Binary strings.
• Date and time. Other data types.
• Character strings.
• bigint. numeric.
• bit. smallint.
• decimal. smallmoney.
• int. tinyint.

What are some good questions to ask in a SQL interview?

In addition to questions about your experience and general questions, you might be asked in-depth questions that require you to solve SQL problems or answer in multiple steps or actions: Prepare sample data from a SQL database using SQL queries. Create a query that selects a mapped piece of data from a table using an alias.

What to do with 50 SQL query questions?

That’s why we’ve selected a set of 50 SQL queries that you can use to step up your learning. We’ve also given SQL scripts to create the test data. So, you can use them to create a test database and tables. Most of the SQL query questions we’ve filtered out of interviews held by top IT MNC like Flipkart and Amazon.

What do you need to know about SQL queries?

SQL is a query language that works with common enterprise data tools and resources. Queries are used within SQL to tell databases what data to process and how to do it. If you’re a data professional, you may need to have a practical understanding of SQL queries and how to use them.

Can you use SQL to create a test database?

We’ve also given SQL scripts to create the test data. So, you can use them to create a test database and tables. Most of the SQL query questions we’ve filtered out of interviews held by top IT MNC like Flipkart and Amazon. So you’ll gain real-time experience by going through them.