我想在 SQL 中创建一个数据查询,以增量方式对行组进行编号,在公共日期时间分组,并保持“组编号”在下一个日期时间递增,依此类推。正如我在使用分区语句时所看到的那样,这些“组号”不得为每个组重置。这是我的示例数据:
ts_DateTime |ID |Value|RowFilter|RequiredResult
--------------------------
2013/01/09 09:23:16 |8009 |0 |1 |1
2013/01/09 09:23:16 |8010 |0 |2 |1
2013/01/09 09:23:16 |8026 |0 |3 |1
2013/01/09 09:23:22 |8026 |0 |1 |2
2013/01/09 09:23:28 |8009 |0 |1 |3
2013/01/09 09:23:28 |8010 |0 |2 |3
2013/01/09 09:23:28 |8026 |0 |3 |3
2013/01/09 09:27:03 |8009 |0 |1 |4
2013/01/09 09:27:03 |8010 |0 |2 |4
2013/01/09 09:27:03 |8026 |0 |3 |4
2013/01/09 09:27:09 |8009 |0 |1 |5
2013/01/09 09:27:09 |8010 |0 |2 |5
2013/01/09 09:27:09 |8026 |0 |3 |5
2013/01/09 09:27:15 |8009 |0 |1 |6
2013/01/09 09:27:15 |8010 |0 |2 |6
2013/01/09 09:27:15 |8026 |0 |3 |6
我用来获取这些结果的查询是:
select hl.ts_DateTime, hl.Tagname as [ID], hl.TagValue as [Value],
ROW_NUMBER() OVER (PARTITION BY hl.ts_datetime ORDER BY hl.tagname) AS RowFilter
from Table1 hl
所以基本上,查看 RowFilter 列,我得到每个的唯一 ROW 编号ts_DateTime
分割。我真正需要的是对于每个ts_DateTime
RowFilter 列的分区应类似于所需的结果列。
你不应该使用ROW_NUMBER()
,
- use
DENSE_RANK()
instead
- remove
PARTITION BY
query,
SELECT hl.ts_DateTime,
hl.Tagname as [ID],
hl.TagValue as [Value],
DENSE_RANK() OVER (ORDER BY ts_datetime) AS RowFilter
FROM Table1 hl
ORDER BY RowFilter
- SQLFiddle 演示 http://sqlfiddle.com/#!3/a333f/7
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