Get N Results per Group using LIMIT within GROUP BY

When it comes to grouping data in SQL, it's common to want to limit the number of results returned per group. Luckily, with the use of the LIMIT clause within the GROUP BY statement, achieving this is relatively straightforward.

To limit the number of results per group, simply include the LIMIT clause after the GROUP BY statement, specifying the desired number of results to be returned per group. For example, let's say we have a table of employees and their departments, and we want to retrieve the top two highest paid employees per department:

SELECT * FROM employees
GROUP BY department

This query groups the employees by department, sorts them in descending order by salary, and limits the results to the top two employees per department.

It's important to note that when using the LIMIT clause within the GROUP BY statement, the results returned may not be consistent between queries, as the order in which the groups are processed is not guaranteed. Additionally, if the number of groups is less than the specified limit, the query will return all results.

In summary, using the LIMIT clause within the GROUP BY statement is a useful tool for limiting the number of results returned per group in SQL. Just remember to use it in conjunction with the appropriate sorting and ordering clauses to achieve the desired results.

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