The filter clause extends aggregate functions (sum, avg, count, …) by an additional where clause. The result of the aggregate is built from only the rows that satisfy the additional where clause too. Syntax. The filter clause follows an aggregate function: …

GROUP BY enables you to use aggregate functions on groups of data returned from a query. FILTER is a modifier used on an aggregate function to limit the values used in an aggregation. All the columns in the select statement that aren’t aggregated should be specified in a GROUP BY clause in the query.

Jan 1, 2011 · The bottom line here is: If you need to filter out rows within the window of the analytic function, move the analytic function to a subquery and filter in the outer query as per @peterm's answer:

In PostgreSQL and TimescaleDB, the FILTER clause can be used to extend aggregate functions like sum (), avg (), and count () by adding a WHERE clause. This is especially useful when you want to perform multiple aggregations in your query.

Apr 2, 2013 · It is very easy to remove values that you don't want aggregated. For instance: Which will exclude all sales with a value less than or equal to 1000 from the summing aggregation. But how do you filter after the aggregation? E.g. WHERE ("Total sales"> 15000)

Jun 25, 2024 · Filter function helps you get specific data from large datasets, which ultimately makes your applications more responsive and the analysis that you perform more directed. Throughout this piece, we will present several means of sorting query outputs in MySQL.

Apr 5, 2022 · This article by Scaler Topics covers various techniques of filtering in SQL like “GROUP BY” clause, “HAVING” clause, and “FILTER” modifier.

FILTER provides a cleaner syntax for pivoting data when compared with the more traditional CASE WHEN approach discussed below. Some aggregate functions also do not filter out NULL values, so using a FILTER clause will return valid results when at times the CASE WHEN approach will not.

Dec 30, 2015 · Postgres 9.4 was released in December 2014 adding the FILTER clause to aggregate functions and this clause is quite useful when you want to count or sum specific records when executing group...

Jul 18, 2018 · In this article, we'll look at a simple example of filtering SQL queries to reduce the complexity of your data. The key to learning how to filter data in SQL is understanding the very basics of Boolean algebra.