Count same values in column SQL Server -

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i trying count same values in column , want return count there off. 

| item  | count | +-------+-------+ | green |  1    | | green |  2    | | green |  3    | | red   |  1    | | red   |  2    |

i tried 

row_number() on (order item) row

but counts each line 1 - 1000

how accomplish this?

you'll want include partition by clause row_number function. makes row_number restart 1 each new type of item.

row_number() on (partition item order item) row

this give result like:

item    row green   1 green   2 green   3 red     1 red     2

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