SQL Interview Questions and Answers: 15 Essential Questions for Data Careers
Master your SQL technical interview with this structured guide. We walk through 15 high-frequency questions, explaining not just the answers, but how the database executes the query and why the interviewer is asking. Perfect for Data Analysts, Data Scientists, and Data Engineers looking for production-ready logic.
Timestamps
0:00 - Introduction: Why SQL is the #1 Data Skill
0:48 - Q1: SQL vs. MySQL (Language vs. Software)
1:59 - Q2: The 5 Subsets of SQL (DQL, DDL, DML, DCL, TCL)
3:25 - Q3: DBMS vs. RDBMS vs. NoSQL
4:30 - Q4: Primary Key vs. Unique Key
5:20 - Q5: Foreign Keys & Referential Inte…
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Chapters (17)
Introduction: Why SQL is the #1 Data Skill
0:48
Q1: SQL vs. MySQL (Language vs. Software)
1:59
Q2: The 5 Subsets of SQL (DQL, DDL, DML, DCL, TCL)
3:25
Q3: DBMS vs. RDBMS vs. NoSQL
4:30
Q4: Primary Key vs. Unique Key
5:20
Q5: Foreign Keys & Referential Integrity
5:56
Q6: The 6 Types of SQL Joins
7:02
Q7: DELETE vs. TRUNCATE vs. DROP
7:26
Q8: WHERE vs. HAVING (Execution Order)
7:58
Q9: Ranking Functions (Row Number, Rank, Dense Rank)
8:16
Q10: Window Functions (Lag & Lead)
8:42
Q11: Subqueries vs. Joins (Performance & Clarity)
9:29
Q12: Database Indexing Explained
10:10
Q13: Handling NULL Values (The "Unknown" Trap)
10:37
Q14: Practical: Find the Second Highest Salary
11:10
Q15: Practical: How to Remove Duplicates
11:57
Summary: Thinking Like a Professional
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