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建站问答 时间:2024-12-01 09:27:08
作者:文/会员上传
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要查询连续出现多次的数据,可以使用窗口函数和分析函数来实现。以下是一个示例查询来查找在一个表中连续出现超过3次的数据:WITH consecutive_counts AS (SELECT *, ROW_NUMBE
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要查询连续出现多次的数据,可以使用窗口函数和分析函数来实现。以下是一个示例查询来查找在一个表中连续出现超过3次的数据:
WITH consecutive_counts AS (SELECT *, ROW_NUMBER() OVER (PARTITION BY data, grp ORDER BY id) AS rnk, ROW_NUMBER() OVER (PARTITION BY data ORDER BY id) - ROW_NUMBER() OVER (PARTITION BY data, grp ORDER BY id) AS diffFROM (SELECT *, ROW_NUMBER() OVER (ORDER BY id) - ROW_NUMBER() OVER (PARTITION BY data ORDER BY id) AS grpFROM your_table) t)SELECT data, COUNT(*) AS consecutive_countFROM consecutive_countsGROUP BY data, diffHAVING COUNT(*) > 3
在这个例子中,首先使用ROW_NUMBER()来给每行数据分配一个唯一的序号,然后根据数据的变化情况(连续出现的数据在同一个grp组中)计算出连续出现次数,并最终根据这个次数来筛选出连续出现超过3次的数据。
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