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you are writing a query to count the number emergency department encounters where the patient arrived in an ambulance. the arrivalmethod column in edvisitfact returns

you are writing a query to count the number emergency department encounters where the patient arrived in an ambulance. the arrivalmethod column in edvisitfact returns 'ambulance' if the patient arrived in an ambulance. which of the following return the desired information

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Rules In Database Systems Third International Workshop Rids 97 Sk Vde Sweden June 26 28 1997 Proceedings Lncs 1312

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