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DECLARE @workflowTable AS TABLE (company varchar(50), workflow varchar(50), [date] datetime)
INSERT INTO @workflowTable VALUES
('CompanyA',      'Workflow27',     'June 5 2011')
,('CompanyA',      'Workflow27',     'June 5 2011')
,('CompanyA',      'Workflow27',     'June 8 2011')
,('CompanyA',      'Workflow27',     'June 12 2011')
,('CompanyB',      'Workflow13',     'Apr 4 2011')
,('CompanyB',      'Workflow13',     'Apr 9 2011')
,('CompanyB',      'Workflow20',     'Dec 11 2011')
,('CompanyB',      'Workflow20',     'Dec 17 2011')

;WITH partitioned AS (
        SELECT company
            ,workflow
            ,date
            -- ,other_columns
            ,ROW_NUMBER() OVER(PARTITION BY company, workflow
                                ORDER BY date) AS seq
                                ,count(*) over (partition by workflow, date order by date) as seq2
        FROM @workflowTable
    )
    SELECT company, workflow, date, seq, sum(seq2)
    FROM partitioned --WHERE seq = 1
    group by company, workflow, date, seq

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edited mar 5

created mar 5 anonymous