What is the difference between WHERE and HAVING?
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In SQL, WHERE and HAVING are both used to filter records, but they work at different stages of query execution.
🔑 WHERE Clause
-
Filters rows before grouping or aggregation.
-
Works on individual records in a table.
-
Cannot be used with aggregate functions like
SUM(),COUNT(),AVG()(unless in a subquery). -
→ Filters rows where department = IT, before grouping or aggregation.
🔑 HAVING Clause
-
Filters groups after aggregation.
-
Always used with
GROUP BY. -
Can work with aggregate functions.
-
→ First groups employees by department, then filters groups having more than 5 employees.
⚡ Key Differences
| Aspect | WHERE | HAVING |
|---|---|---|
| Execution Stage | Before grouping | After grouping/aggregation |
| Works On | Individual rows | Groups or aggregated results |
| Aggregates | Cannot use aggregate functions | Can use aggregate functions (SUM(), AVG()) |
| Requirement | Can be used without GROUP BY | Usually used with GROUP BY |
👉 Summary:
-
Use WHERE to filter raw data before grouping.
-
Use HAVING to filter aggregated/grouped results.
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