您可以使用以下
CASE语句：
SELECT count(id), SUM(hour) as totHour, SUM(case when kind = 1 then 1 else 0 end) as countKindOne
您可以使用以下
CASE语句：
SELECT count(id), SUM(hour) as totHour, SUM(case when kind = 1 then 1 else 0 end) as countKindOne
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