mysql查詢與連接查詢，mysql的關聯查詢求和？
參考sql語句
select
sum(casewhena1=1then1else0end)asa1count,
sum(casewhena2=1then1else0end)asa2count,
sum(casewhena3=1then1else0end)asa3count,
sum(casewhena4=1then1else0end)asa4count
from表
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