sql聯合查詢 一條select語句 查詢多個結果,顯示

聯合查詢 舉例:spa    select (select COUNT(id) from emailcontent where  state=1 and hasRead=0) as a,     (select COUNT(id) from emailcontent where state=1 and hasRead=1) as b,     (select COUNT(id) from emai
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