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Mar 27, 2024 · SQL Query Interview Questions. Last Updated : 27 Mar, 2024. SQL or Structured Query Language is a standard language for relational databases. SQL queries are powerful tools used to, manipulate, and manage data stored in these databases like MySQL, Oracle, PostgreSQL, etc.
- SQL Interview Questions and Answers For Freshers
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1.What is SQL?
SQL stands for Structured Query Language. It is a language used to interact with the database, i.e to create a database, to create a table in the database, to retrieve data or update a table in the database, etc. SQL is an ANSI(American National Standards Institute) standard. Using SQL, we can do many things. For example – we can execute queries, we can insert records into a table, can update records, can create a database, can create a table, can delete a table, etc.
2. What is a database?
A Database is defined as a structured form of data storage in a computer or a collection of data in an organized manner and can be accessed in various ways. It is also the collection of schemas, tables, queries, views, etc. Databases help us with easily storing, accessing, and manipulating data held on a computer. The Database Management System allows a user to interact with the database.
3. Does SQL support programming language features?
It is true that SQL is a language, but it does not support programming as it is not a programming language, it is a command language. We do not have conditional statements in SQL like for loops or if..else, we only have commands which we can use to query, update, delete, etc. data in the database. SQL allows us to manipulate data in a database.
32. What are the differences between SQL and PL/SQL?
Some common differences between SQL and PL/SQL are as shown below:
33. What is the difference between BETWEEN and IN operators in SQL?
BETWEEN: The BETWEENoperator is used to fetch rows based on a range of values. For example, This query will select all those rows from the table. Students where the value of the field ROLL_NO lies between 20 and 30. IN:The IN operator is used to check for values contained in specific sets. For example, This query will select all those rows from the table Students where the value of the field ROLL_NO is either 20 or 21 or 23.
34. Write an SQL query to find the names of employees starting with ‘A’.
The LIKE operator of SQL is used for this purpose. It is used to fetch filtered data by searching for a particular pattern in the where clause. The Syntax for using LIKE is, The required query is: You may refer to this article WHERE clausefor more details on the LIKE operator.
48. Name different types of case manipulation functions available in SQL.
There are three types of case manipulation functions available in SQL. They are, 1. LOWER: The purpose of this function is to return the string in lowercase. It takes a string as an argument and returns the string by converting it into lower case. Syntax: 1. UPPER: The purpose of this function is to return the string in uppercase. It takes a string as an argument and returns the string by converting it into uppercase. Syntax: 1. INITCAP: The purpose of this function is to return the string wi...
49. What are local and global variables and their differences?
1. Global Variable: In contrast, global variables are variables that are defined outside of functions. These variables have global scope, so they can be used by any function without passing them to the function as parameters. 1. Local Variable: Local variables are variables that are defined within functions. They have local scope, which means that they can only be used within the functions that define them.
50. Name the function which is used to remove spaces at the end of a string?
In SQL the spaces at the end of the string are removed by a trim function. Syntax:
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The 80 Top SQL Interview Questions and Answers for Beginners & Intermediate Practitioners. This article provides a comprehensive overview of 80 essential SQL questions and answers for job hunters, hiring managers, and recruiters, covering both general topics and technical questions. Updated Feb 2024 · 12 min read.
Mar 21, 2024 · sql interview questions. SQL for advanced. Table of Contents. Interview Preparation as an Experienced SQL User. Question 1: Select Freelancers and Their Task Info. Question 2: What Are OUTER JOINs and When Do You Use Them? Question 3: Select Freelancer and Task Info, Part 2. Question 4: Select Freelancer Info for Projects Due in 2024.
Jun 2, 2022 · 28 minute read | June 2, 2022. Written by: Sakshi Gupta. In recent years, Structured Query Language (SQL) has become central to businesses that employ data science methods. SQL is a programming language used to input and extract information from databases.
Apr 16, 2024 · Question 1: What is SQL? Question 2: List the basic elements of an SQL query. Question 3: How do you select all the data from a table? Question 4: How do you select certain columns from a table? Question 5: Explain the syntax of the WHERE clause. Question 6: How do you filter query results based on multiple conditions?
Jan 3, 2024 · exit. Get a Free Personalized Career Roadmap. Answer 4 simple questions about you and get a path to a lucrative career. Expand in New Tab. / Interview Guides / SQL Interview Questions. SQL Interview Questions. Last Updated: Jan 03, 2024. Download PDF. Your requested download is ready! Click here to download. Powered by. Certificate included.
