sql server - How to filter on ROW_NUMBER() -


i trying select distinct name dataset return other columns. have working degree cant figure out how bring together.

i suspect need x( or unsure

here code , image of data returns. here want show where rn=1 shown circled in red in image

select     row_number() on (partition tagname order adddate) rn,     tagname,     right(v_alarmswithtagname.tagname,charindex('.',reverse(v_alarmswithtagname.tagname))-1) scada_tag,      convert(varchar(12) , adddate , 101) adddate,     left(tagname,charindex('.',tagname)-1) 'table',     [cc_note_log].dbo.scada_db.groupid 'group',     [cc_note_log].dbo.scada_db.dataset 'dataset',      [cc_note_log].dbo.scada_db.description 'description' "buckeye kb".dbo.v_alarmswithtagname join      [cc_note_log].dbo.scada_db on      right(v_alarmswithtagname.tagname,charindex('.',reverse(v_alarmswithtagname.tagname))-1)=[cc_note_log].dbo.scada_db.scada_sr_tag     [cc_note_log].dbo.scada_db.groupid<>'test' ,     [cc_note_log].dbo.scada_db.groupid not 'keep%' ,     [cc_note_log].dbo.scada_db.groupid not 'delete%' ,     tagname not '%.es_%' ,     tagname not '%.opc_%'

enter image description here

you need common table expression (cte). use following syntax: ;with cte (query) select whatever cte ...please take @ below code block.

;with cte ( select     row_number() on (partition tagname order adddate) rn,     tagname,     right(v_alarmswithtagname.tagname,charindex('.',reverse(v_alarmswithtagname.tagname))-1) scada_tag,      convert(varchar(12) , adddate , 101) adddate,     left(tagname,charindex('.',tagname)-1) 'table',     [cc_note_log].dbo.scada_db.groupid 'group',     [cc_note_log].dbo.scada_db.dataset 'dataset',      [cc_note_log].dbo.scada_db.description 'description' "buckeye kb".dbo.v_alarmswithtagname join      [cc_note_log].dbo.scada_db on      right(v_alarmswithtagname.tagname,charindex('.',reverse(v_alarmswithtagname.tagname))-1)=[cc_note_log].dbo.scada_db.scada_sr_tag     [cc_note_log].dbo.scada_db.groupid<>'test' ,     [cc_note_log].dbo.scada_db.groupid not 'keep%' ,     [cc_note_log].dbo.scada_db.groupid not 'delete%' ,     tagname not '%.es_%' ,     tagname not '%.opc_%' ) select * cte [rn] = 1

it important note cte doesn't have directly followed select. please see following link cte guidelines: https://msdn.microsoft.com/en-us/library/ms175972.aspx


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