如果您的DBMS支持窗口功能（例如sql Server 2005+）
SELECT id,
count(*) AS res
FROM (SELECT *,
[pNum] - ROW_NUMBER() OVER (PARTITION BY [id] ORDER BY [pNum]) AS Grp
FROM YourTable) T
GROUP BY id,
Grp
SQL计数按数字序列分组
SQL计数按数字序列分组
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