T-SQL top 1 in group
語法：ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)
example:
with cte AS
(
SELECT *,
ROW_NUMBER() OVER (PARTITION BY ChartKey,WorkflowKey ORDER BY EditDate DESC) AS rn
FROM pins
)
SELECT *
FROM cte
WHERE rn = 1
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T-SQL top 1 in group
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