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In this video, we cover the Top 45 SQL Interview Questions in 2025, designed to help both freshers and experienced professionals prepare for their next big interview. These questions range from SQL commands like SELECT, INSERT, and DELETE, to joins, normalization, indexing, and transaction management.
00:00 - Introduction
02:12 - What is SQL and its basic operations?
03:15 - What are the different types of SQL commands?
05:33 - What is a primary key in SQL?
06:42 - What is a foreign key in SQL?
07:46 - Difference between DELETE and TRUNCATE commands.
09:24 - What is a JOIN in SQL and its types?
12:09 - What is a NULL value in SQL?
12:44 - What is a UNIQUE key in SQL?
13:15 - What is a database?
14:19 - SQL vs. NoSQL databases.
15:30 - What is a table and field in SQL?
16:37 - Describe the SELECT statement.
17:44 - What are constraints in SQL?
18:51 - What is normalization in SQL?
19:57 - How to use the WHERE clause?
20:32 - Difference between UNION and UNION ALL.
21:03 - Analyze query result examples.
25:38 - What is a view in SQL?
28:19 - How to update a value in SQL.
29:01 - Types of JOINs in SQL with examples.
29:29 - What is a subquery?
30:43 - What are correlated subqueries?
31:13 - What is a transaction in SQL?
31:45 - What are ACID properties in SQL?
33:29 - How to implement error handling in SQL.
35:12 - Normalization vs. Denormalization.
37:58 - What is SQL injection?
38:33 - How to create a stored procedure in SQL?
39:05 - What is a deadlock in SQL and how to prevent it?
40:14 - Difference between IN and EXISTS.
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➡️ About Post Graduate Program In Data Analytics
This Data Analytics Program is ideal for all working professionals and prior programming knowledge is not required. It covers topics like data analysis, data visualization, regression techniques, and supervised learning in-depth via our applied learning model with live sessions by leading practitioners and industry projects.
Key Features
✅ Post Graduate Program certificate and Alumni Association membership
✅ Exclusive hackathons and Ask me Anything sessions by IBM
✅ 8X higher live interaction in live online classes by industry experts
✅ Capstone from 3 domains and 14+ Data Analytics Projects with Industry datasets from Google PlayStore, Lyft, World Bank etc.
✅ Master Classes delivered by Purdue faculty and IBM experts
✅ Simplilearn's JobAssist helps you get noticed by top hiring companies
✅ Resume preparation and LinkedIn profile building
✅ 1:1 mock interview
✅ Career accelerator webinars
Skills Covered
✅ Data Analytics
✅ Statistical Analysis using Excel
✅ Data Analysis Python and R
✅ Data Visualization Tableau and Power BI
✅ Linear and logistic regression modules
✅ Clustering using kmeans
✅ Supervised Learning
Learning Path
✅ Induction Session for Purdue Data Analytics Program
✅ PG DA - Business Analytics with Excel
✅ PG DA - SQL
✅ PG DA - Programming foundation and Data Analytics with Python
✅ PG DA - R programming for Data Science
✅ PG DA - Data Analytics with R
✅ PG DA - Tableau Training
✅ PG DA - Data Analytics Capstone
Electives:
✅ PL-300 Microsoft Power BI Certification Training
✅ Academic Masterclass by Purdue University Online
✅ Industry Master Class – Data Analytics
✅ Generative AI Masterclass
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