What is the difference between DDL, DML, and DCL?
This SQL question categorizes database commands by function. It tests basic SQL classification knowledge.
Why Interviewers Ask This
Knowing command categories helps in writing correct scripts. Interviewers assess fundamental SQL literacy. This is a baseline requirement for DB roles.
How to Answer This Question
Define DDL (structure), DML (data), DCL (permissions). Give examples for each (CREATE, SELECT, GRANT). Explain scope of changes. Mention DTL (transaction control) if relevant. Keep distinctions clear.
Key Points to Cover
- Structure vs data vs access
- Command examples
- Scope of changes
- Category clarity
Sample Answer
DDL (Data Definition Language) defines database structure, e.g., CREATE, ALTER. DML (Data Manipulation Language) handles data, e.g., INSERT, UPDATE, DELETE. DCL (Data Control Language) manages access rights, e.g., GRANT, REVOKE. Together, they cover all aspects of database interaction: defining schemas, modifying content, and securing access. Understanding these categories ensures proper command usage in SQL development.
Common Mistakes to Avoid
- Mixing command types
- No examples given
- Confusing DCL with DDL
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