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how to get records count by hourly wise?

Posted By :Dhivakaran     Posted Date :November 22, 2010    Points :10   Category :Sql Server 
SELECT Count (*), to_char(col_datetime,'yyyymmdd HH24') FROM tblname where Trunc(col_datetime) =Trunc(SYSDATE-1) group by to_char(col_datetime,'yyyymmdd HH24')

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