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Jul 5, 2024 · In this article, we cover 70+ SQL Interview Questions with answers asked in SQL developer interviews at MAANG and other high-paying companies. Whether you are a fresher or an experienced professional with 2, 5, or 10 years of experience, this article gives you all the confidence you need to ace your next SQL interview.
- Top 45+ SQL Query Interview Questions and Answers (2024)
Let us start by taking a look at some of the most asked SQL...
- Top 45+ SQL Query Interview Questions and Answers (2024)
- SQL Interview Questions For Freshers
- SQL Interview Questions For 3 Years Experience
- SQL Interview Questions For 5 Years Experience
- SQL Interview Questions For 10+ Years Experience
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1. What is DBMS?
A Database Management System (DBMS) is a program that controls creation, maintenance and use of a database. DBMS can be termed as File Manager that manages data in a database rather than saving it in file systems. 👉 Free PDF Download: SQL Interview Questions & Answers >>
2. What is RDBMS?
RDBMS stands for Relational Database Management System. RDBMS store the data into the collection of tables, which is related by common fields between the columns of the table. It also provides relational operators to manipulate the data stored into the tables. Example: SQL Server.
3. What is SQL?
SQL stands for Structured Query Language , and it is used to communicate with the Database. This is a standard language used to perform tasks such as retrieval, updation, insertion and deletion of data from a database. Standard SQL Commandsare Select.
11. What is normalization?
Normalization is the process of minimizing redundancy and dependency by organizing fields and table of a database. The main aim of Normalization is to add, delete or modify field that can be made in a single table.
12. What is Denormalization?
DeNormalization is a technique used to access the data from higher to lower normal forms of database. It is also process of introducing redundancy into a table by incorporating data from the related tables.
13. What are all the different normalizations?
Database Normalizationcan be easily understood with the help of a case study. The normal forms can be divided into 6 forms, and they are explained below -. 1. First Normal Form (1NF):. This should remove all the duplicate columns from the table. Creation of tables for the related data and identification of unique columns. 1. Second Normal Form (2NF):. Meeting all requirements of the first normal form. Placing the subsets of data in separate tables and Creation of relationships between the tab...
21. What are the types of subquery?
There are two types of subquery – Correlated and Non-Correlated. A correlated subquery cannot be considered as independent query, but it can refer the column in a table listed in the FROM the list of the main query. A Non-Correlated sub query can be considered as independent query and the output of subquery are substituted in the main query.
22. What is a stored procedure?
Stored Procedure is a function consists of many SQL statement to access the database system. Several SQL statements are consolidated into a stored procedure and execute them whenever and wherever required.
23. What is a trigger?
A DB trigger is a code or programs that automatically execute with response to some event on a table or view in a database. Mainly, trigger helps to maintain the integrity of the database. Example: When a new student is added to the student database, new records should be created in the related tables like Exam, Score and Attendance tables.
41. What is Union, minus and Interact commands?
UNION operator is used to combine the results of two tables, and it eliminates duplicate rows from the tables. MINUS operator is used to return rows from the first query but not from the second query. Matching records of first and second query and other rows from the first query will be displayed as a result set. INTERSECT operator is used to return rows returned by both the queries.
42. What is an ALIAS command?
ALIAS name can be given to a table or column. This alias name can be referred in WHERE clauseto identify the table or column. Example-. Here, st refers to alias name for student table and Ex refers to alias name for exam table.
43. What is the difference between TRUNCATE and DROP statements?
TRUNCATE removes all the rows from the table, and it cannot be rolled back. DROP command removes a table from the database and operation cannot be rolled back.
Prepare for your SQL interview with 50 questions and answers for freshers and experienced candidates. Learn about DBMS, RDBMS, SQL, database, tables, keys, joins, normalization, indexes, cursors and more.
Oct 4, 2023 · Prepare for SQL interviews with common questions and answers on topics such as joins, set operators, data types, DBMS, OLTP, OLAP, and more. Learn the syntax, functions, and examples of SQL commands and concepts with PrepInsta.
- What is Database? 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.
- What is DBMS? DBMS stands for Database Management System. DBMS is a system software responsible for the creation, retrieval, updation and management of the database.
- What is RDBMS? How is it different from DBMS? RDBMS stands for Relational Database Management System. The key difference here, compared to DBMS, is that RDBMS stores data in the form of a collection of tables and relations can be defined between the common fields of these tables.
- What is SQL? SQL stands for Structured Query Language. It is the standard language for relational database management systems. It is especially useful in handling organized data comprised of entities (variables) and relations between different entities of the data.
Aug 20, 2024 · We’ve gathered some of the most common basic SQL interview questions that freshers often encounter. With this guide, you’ll be well-prepared to tackle these SQL interview questions and answers for freshers and make a strong impression in your interview. Practice SQL Interview Questions and Answers.
Feb 15, 2024 · Learn 80 essential SQL questions and answers for job hunters and hiring managers, covering general topics and technical skills. Find out what SQL is, its applications, commands, functions, queries, and more.
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Sep 18, 2024 · Learn 45+ SQL query interview questions and answers for data analyst and data engineer positions. Use sample tables to perform various query operations and get output examples.
