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WITH yourTable AS ( SELECT 1 AS FooID, 332 AS Bar, 10 AS Price UNION ALL SELECT 2, 332, 10 UNION ALL SELECT 3, 333, 5 UNION ALL SELECT 4, 334, 30 UNION ALL SELECT 4, 334, 30 UNION ALL SELECT 4, 334, 30 ), cte AS ( SELECT Bar, COUNT(*) AS cnt FROM yourTable GROUP BY Bar ) SELECT FooID, Bar, Price / COUNT(*) OVER (PARTITION BY Bar) AS new_price FROM yourTable;
FooID
Bar
new_price
2
332
5
1
332
5
3
333
5
4
334
10
4
334
10
4
334
10