What is the difference between “where” and “having” in a database?

WHERE and HAVING are two condition statements used in database queries.

The WHERE clause is used to filter rows, appearing after the FROM clause in a SELECT statement. It selects rows from a table based on specified conditions, often utilized to only return rows that meet certain criteria.

The HAVING clause is used to filter groups and appears after the GROUP BY clause in the SELECT statement. It selects groups that meet specified conditions from the grouped results. It is typically used to filter groups so that only those meeting specific criteria are returned.

In summary, the WHERE clause is used to filter rows, while the HAVING clause is used to filter groups. The WHERE clause applies filtering criteria before executing the query, whereas the HAVING clause applies filtering criteria after executing the query.