What is the difference between SQL DDL and DML?

DDL defines structure (CREATE, DROP). DML handles data (INSERT, UPDATE).

How do you use LIKE and IN in SQL WHERE clauses?

LIKE for patterns: 'A%'. IN for lists: city IN ('NYC', 'LA').

What does CASE WHEN do in SQL?

Conditional logic: CASE WHEN condition THEN value ELSE other END. Bins data smartly.

SQL Basics That Built the Internet: DDL, DML, and the WHERE Clause Magic

NoSQL was supposed to bury SQL. Yet here we are, still crafting tables with CREATE and slicing data via WHERE. One developer's first-week epiphany reveals why.

DevTools Feed Apr 11, 2026 4 min read

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SQL DDL and DML commands creating and populating a students table

⚡ Key Takeaways

DDL builds database structure; DML manipulates the data within it. 𝕏
WHERE with LIKE, IN, BETWEEN filters precisely, powering efficient queries. 𝕏
CASE WHEN adds logic, turning raw numbers into insights — essential for real apps. 𝕏

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