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SQLPARTITION BYwindowtutorial

What is PARTITION BY in SQL? Groups inside a window for beginners

PARTITION BY is the part of OVER that splits rows into groups for window functions. Plain words: like GROUP BY, but rows don't collapse — each row stays, with its group's aggregate appended. The difference from GROUP BY, typical patterns, and aggregate behavior inside windows.

1 min qariSQL · PARTITION BY · window · tutorial

PARTITION BY is the part of an OVER clause that splits rows into groups for a window function. Like GROUP BY, but the rows don't collapse — each row stays, with the group's computation appended.

This article is currently in Russian. The full English translation is on the way.

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