mysql统计一年12月的数据

效果图:   select sum(case month(createTime) when '1' then 1 else 0 end) as 一月份, sum(case month(createTime) when '2' then 1 else 0 end) as 二月份, sum(case month(createTime) when '3' then 1 else 0 end) as 三

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