mysql - count number of sales for each ID -

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i have sales_log database 

itemid             status 250                  completed 251                  completed  260                  completed 251                  completed

i want query number of sales of each item id

  itemid             sales     250                 1     251                 2     260                 1

so presumably need select item ids where status completed, group by item id, making sure count grouped rows.

those italicised keywords should more enough solve problem, provided invest time in learning tools.


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