Portable way to count only paid orders in a window when FILTER clause is unavailable?

Problem Statement

Explanation

CASE inside SUM is widely supported and yields a conditional count. FILTER is elegant where supported, but not universal across engines. This pattern also works for conditional sums and averages by returning the numeric to aggregate or zero.

Code Solution

SolutionRead Only

SUM(CASE WHEN status='PAID' THEN 1 ELSE 0 END)
OVER (PARTITION BY customer_id) AS paid_cnt

Practice Sets

This question appears in the following practice sets:

Window Functions & Analytics

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Portable way to count only paid orders in a window when FILTER clause is unavailable?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

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Portable way to count only paid orders in a window when FILTER clause is unavailable?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime