mysql查询当天的数据
1.查询当天数据
第一种：数量小的时候用，数据量稍微起来巨慢
select 字段 from 表名 where to_days(时间字段) = to_days(now());
第二种：速度快
select 字段 from 表名 where 时间字段 BETWEEN CONCAT(CURDATE(),' 00:00:00') AND CONCAT(CURDATE(),' 23:59:59');
最好配合复合索引来查，避免全表扫描
2.查询昨天的数据
SELECT * FROM `day_sell` WHERE TO_DAYS(NOW()) - TO_DAYS(sell_time) <= 1
3.查询最近7天的（包含7天总计7天）
#7天的数据
SELECT * FROM `day_sell` WHERE DATE_SUB(CURDATE(),INTERVAL 7 DAY) < DATE(sell_time);SELECT * FROM day_sell WHERE YEARWEEK(DATE_FORMAT(sell_time,'%Y-%m-%d')) = YEARWEEK(NOW());#上周的数据SELECT * FROM day_sell WHERE YEARWEEK(DATE_FORMAT(sell_time,'%Y-%m-%d')) = YEARWEEK(NOW()) -1;
4.查询本月的数据
SELECT * FROM `day_sell` WHERE DATE_FORMAT(sell_time,'%Y-%m')= DATE_FORMAT(CURDATE(),'%Y-%m')
5.查询上个月的数据
SELECT * FROM day_sell WHERE PERIOD_DIFF(DATE_FORMAT(NOW(),'%Y%m'),DATE_FORMAT(sell_time,'%Y%m')) = 1;
6.查询上季度
SELECT * FROM day_sell WHERE QUARTER(sell_time) = QUARTER(DATE_SUB(NOW(),INTERVAL 1 QUARTER));
7.查询本季度
SELECT * FROM `day_sell` WHERE QUARTER(sell_time) = QUARTER(NOW())
8.查询今年的数据
SELECT * FROM `day_sell` WHERE YEAR(sell_time) = YEAR(NOW())
9.计算两个时间间隔-天
SELECT DATEDIFF('2020-10-29','2020-10-28') AS days;
10.按周统计
SELECT DATE_FORMAT(sell_time,'%Y%u') weeks,COUNT(sell_time) COUNT FROM `day_sell` GROUP BY weeks;
11.按天统计
SELECT DATE_FORMAT(sell_time,'%Y%m%d') days,COUNT(sell_time) COUNT FROM day_sell GROUP BY days;
12.按月统计
SELECT DATE_FORMAT(sell_time,'%Y%m') months,COUNT(sell_time) COUNT FROM day_sell GROUP BY months;
13.查询去年
SELECT * FROM day_sell WHERE YEAR(sell_time) = YEAR(DATE_SUB(NOW(),INTERVAL 1 YEAR));
14.查询近6个月的数据
SELECT * FROM day_sell WHERE sell_time BETWEEN DATE_SUB(NOW(),INTERVAL 6 MONTH) AND NOW();
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