What is the difference between the WHERE and HAVING clauses in SQL queries?

Understanding the Difference Between WHERE and HAVING Clauses in SQL Queries

When it comes to SQL queries, it's crucial to understand the distinction between the WHERE and HAVING clauses. These clauses are used to filter data in queries, but they serve different purposes.

Focus Keyword: WHERE and HAVING Clauses

WHERE Clause: The WHERE clause is used to filter rows based on specified conditions in a SQL query. It is applied to individual rows before the query's result set is grouped or aggregated.

HAVING Clause: On the other hand, the HAVING clause is used to filter results based on specified conditions after the data has been grouped by the GROUP BY clause. It filters the groups that are produced by the GROUP BY clause.

In summary, the WHERE clause is used with individual rows, while the HAVING clause is used with groups of data. Understanding when to use each clause is essential for writing efficient and accurate SQL queries.