查詢時間間隔：
DATE(create_time) < DATE_SUB(CURDATE(), INTERVAL 1 DAY); DATE(create_time) < DATE_SUB(CURDATE(), INTERVAL 7 month);
createtime < DATE_SUB(NOW(),INTERVAL 5 MONTH)
根據時間分類排序：
/*按天統計*/ GROUP BY DATE(create_time) ORDER BY DATE(create_time) DESC; /*按周統計*/ GROUP BY WEEK(create_time) ORDER BY WEEK(create_time) DESC; /*按月統計*/ GROUP BY MONTH(create_time) ORDER BY MONTH(create_time) DESC; /*按季度統計*/ GROUP BY QUARTER(create_time) ORDER BY QUARTER(create_time) DESC; /*按年統計*/ GROUP BY YEAR(create_time) ORDER BY YEAR(create_time) DESC;
/*查年示例寫法*/
YEAR(createtime) YEAR
只查詢年、月、日、小時、分鍾或者組合查詢：
格式:EXTRACT(unit FROM date)
unit支持的格式如下：
MICROSECOND,
SECOND,
MINUTE,
HOUR,
DAY,
WEEK,
MONTH,
QUARTER,
YEAR,
DAY_MICROSECOND,
HOUR_MICROSECOND,
MINUTE_MICROSECOND,
SECOND_MICROSECOND,
DAY_HOUR,
DAY_MINUTE,
HOUR_MINUTE,
DAY_SECOND,
HOUR_SECOND,
MINUTE_SECOND,
YEAR_MONTH
獲取當前時間
yyyy-mm-dd hh:mm:ss - now()
yyyy-mm-dd hh:mm:ss - curdate()
yyyy-mm-dd hh:mm:ss - curtime()
按小時分組查詢
GROUP BY DATE_FORMAT( CREATETIME, '%Y-%m-%d %H' )
日期相減計算天數
TO_DAYS(日期)-TO_DAYS(日期)
