sql將日期按照年月分組並統計數量

1 SELECT DATE_FORMAT(releaseDate,"%Y年%m月") AS dates,COUNT(*) FROM t_diary GROUP BY DATE_FORMAT(releaseDate,"%Y年%m月")
 ORDER BY DATE_FORMAT(releaseDate,"%Y年%m月") DESC ;
releaseDate 日期 t_diary表名 
DATE_FORMAT();按照格式對某個日期操作
ORDER BY 排序
DESC 降序
整段代碼的意思是：從t_diary表中 查詢日期（releaseDate）（將日期按照"%Y年%m月"格式）並作為dates，統計數量（count(*)）,按照日期分組 GROUP BYDATE_FORMAT(releaseDate,"%Y年%m月")，並降序 ORDER BY DATE_FORMAT(releaseDate,"%Y年%m月") DESC 。

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