I have a database in would like to make a piechart form it,the database has a column for the different blood groups e.g (A-,A+,O,B-,B+) and all these appear several times.I would like to know the sql server query that can count and return how many times each blood group appears in the blood group column.After that i would like to know how i can represent the results on a pie chart? thanks!
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