select
sum(case when flag = 0 then 1 else 0 end) as flag0 , sum(case when flag = 0 then 1 else 0
sum(case when flag = 0 then 1 else 0 end) as flag0 , sum(case when flag = 0 then 1 else 0
阅读背景：
如何统计一个字段内几个值的总和？
来源：互联网
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