In a window definition, what do PARTITION BY and ORDER BY control?

Problem Statement

Explanation

PARTITION BY splits the result set into logical groups. The function runs separately within each partition. ORDER BY sets the sequence inside each partition so the function can compute running or ranked results. Leaving PARTITION BY out means the entire result is a single partition. Leaving ORDER BY out makes ranking undefined and turns many analytics into simple per-partition aggregates.

Code Solution

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SUM(amount) OVER (PARTITION BY customer_id ORDER BY sale_ts)

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Window Functions & Analytics

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In a window definition, what do PARTITION BY and ORDER BY control?

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?

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Master Interviews Anywhere, Anytime

In a window definition, what do PARTITION BY and ORDER BY control?

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