What is the difference between WHERE and HAVING in SQL?
Understand the Problem
The question is asking about the distinction between the SQL clauses 'WHERE' and 'HAVING'. The 'WHERE' clause is used for filtering records before any groupings are made, whereas 'HAVING' is used to filter records after aggregations have taken place. Understanding these differences is crucial for writing effective SQL queries.
Answer
WHERE filters individual rows; HAVING filters groups.
The final answer is WHERE filters individual rows before aggregation, while HAVING filters groups after aggregation.
Answer for screen readers
The final answer is WHERE filters individual rows before aggregation, while HAVING filters groups after aggregation.
More Information
In SQL, the WHERE clause focuses on filtering rows before any grouping or aggregation has taken place, while the HAVING clause applies after the data has been grouped, mainly to filter the aggregated results.
Tips
A common mistake is trying to use aggregate functions directly in a WHERE clause, which should only be done in the HAVING clause.
Sources
- Difference between Where and Having Clause in SQL - geeksforgeeks.org
- Difference between Where and Having Clause in SQL - byjus.com
- Difference between WHERE vs HAVING Clause in SQL - dev.to
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