The blood bank needs to know what blood types are represented in the patient database. Return a list of all distinct blood types, sorted alphabetically.
Schema
🔑idINT
first_nameTEXT
last_nameTEXT
date_of_birthTEXT
genderTEXT
emailTEXT
phoneTEXTNULL
blood_typeTEXT
cityTEXT
stateTEXT
🔗insurance_idINTNULL
created_atTIMESTAMP
postgresql
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