DECLARE @workflowTable AS TABLE (company varchar(50), wor...

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

;WITH partitioned AS (
        SELECT company
            ,workflow
            ,date
            ,cancel
            ,ROW_NUMBER() OVER(PARTITION BY company, workflow
                                ORDER BY date) AS seq
        FROM @workflowTable
    )
    SELECT *
    FROM partitioned WHERE seq = 1

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