sql - Update a column paratitioned by another column -


i have table 2 columns this:

basedon                        line mm2013000028 mm2013000028 mm2013000028 mm2013000029 mm2013000030 mm2013000030

the line number blank should be:

basedon                   line mm2013000028              001 mm2013000028              002 mm2013000028              003 mm2013000029              001 mm2013000030              001 mm2013000030              002

this how row number (partitioned baseon) , update result set:

with r_sometable ( select * , row_number() over(partition baseon order baseon) rnk sometable )  update r_sometable set line = rnk go

you can @ question more details:
http://social.msdn.microsoft.com/forums/sqlserver/en-us/ee06f451-c418-4bca-8288-010410e8cf14/update-table-using-rownumber-over


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