SQL Interview Questions and Answers

In this video, Faisal Nadeem shared 9 most important sql interview questions and answers or sql developer interview questions and answers or sql interview questions and answers for freshers or sql job training or sql interview questions and answers for experienced or sql work completely explained by @Knowledge Topper with suitable examples. Q1) What is SQL? Answer: SQL stands for Structured Query Language. It’s used to communicate with and manage data in a relational database. Q2) What is a subquery in SQL? Answer: A subquery is a query nested inside another query to retrieve data used by the outer query. Q3) What is a primary key? Answer: A primary key is a unique identifier for each record in a table. It cannot be null or duplicated. Q4) What is a foreign key? Answer: A foreign key is a field in one table that links to the primary key in another table, creating a relationship between the two. Q5) What is the difference between WHERE and HAVING? Answer: WHERE filters rows before grouping; HAVING filters groups after aggregation. Q6) What is a JOIN in SQL? Answer: A JOIN is used to combine rows from two or more tables based on a related column between them. Q7) What is normalization? Answer: Normalization is the process of organizing data to reduce redundancy and improve data integrity. Q8) How do you find duplicate records in a table? Answer: By using GROUP BY with HAVING COUNT(*) 1 on the target column. Q9) Why do you want to work with SQL? Answer: Because I enjoy working with structured data and solving problems by writing clear and efficient queries. This video covers the following information: sql interview questions and answers sql interview questions sql interview questions and answers for freshers sql internship sql interview questions for freshers sql interview questions for beginners sql interview playlist sql internship interview questions sql interview data engineer sql interview questions and answers latest sql interview questions and answers for experienced sql interview questions and answers for freshers sql interview questions and answers for experienced sql interview questions and answers gate smashers sql interview questions for data engineer sql interview preparation gate smashers sql full playlist in hindi sql interview questions and answers sql interview questions sql queries asked in interview for freshers sql full course sql sql tutorial for beginners sql course sql injection sql server installation sql queries sql joins sql project sql database sql interview questions and answers questpond sql interview questions for beginners sql interview playlist sql internship interview questions sql interview data engineer sql interview questions and answers latest sql interview questions and answers for freshers sql interview questions and answers for experienced sql interview questions and answers gate smashers sql interview questions and answers questpond sql interview questions and answers query sql interview questions and answers for data engineer sql interview questions and answers playlist sql interview questions and answers latest sql interview questions and answers happy rawat sql interview questions and answers for 10 years experience sql interview questions and answers short sql interview questions and answers campusx sql interview questions and answers happy interview sql interview questions and answers code Youtube: https://www.youtube.com/KnowledgeTopper/ Facebook: https://www.facebook.com/KnowledgeTopper/ Facebook Group: https://www.facebook.com/groups// #python #interview #knowledgetopper #jobinterview #jobs