前言#

最近在做项目涉及到Mysql的复杂日期查询，日期查询其实在数据库中查询其实还是用的挺多的，比如查询开始日期到结束日期的区间信息，查询日期小于有效日期的信息，查询当天的日期，明天的日期，做比较等。

查询使用场景案例#

1. 时间区间查询

查询,2021年06月01号到2021年08月25号的数据

SELECT

    *

FROM

    `dateTest` 

where  DATE_FORMAT(date,'%Y%m%d') BETWEEN '20210601' and '20210825'

包括开始时间，不包括结束时间

但是DATE_FORMAT(date,'%Y%m')这种写法，无法使用索引，数据量大了以后查询超级慢

查询日期今天时间比较数据

select * from t_user t where  t.CREATE_TIME>=curdate()

通过DATE把时间日期转换为时间格式

select * from t_user t where  DATE (t.CREATE_TIME)>=DATE (now())

常用的周期时间查询

-- 今天

select fullName,addedTime from t_user where to_days(addedTime) <= to_days(now());

-- 昨天

select fullName,addedTime from t_user where to_days(NOW()) - TO_DAYS(addedTime) <= 1;

-- 近7天

select fullName,addedTime from t_user where date_sub(CURDATE(),INTERVAL 7 DAY) <= DATE(addedTime);

-- 近30天

SELECT fullName,addedTime FROM t_user where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(addedTime);

-- 本月

SELECT fullName,addedTime FROM t_user WHERE DATE_FORMAT( addedTime, '%Y%m' ) = DATE_FORMAT( CURDATE() , '%Y%m' );

-- 上一月

SELECT fullName,addedTime FROM t_user WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( addedTime, '%Y%m' ) ) =1;

-- 查询本季度数据

select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(now());

-- 查询上季度数据

select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));

-- 查询本年数据

select fullName,addedTime FROM t_user where YEAR(addedTime)=YEAR(NOW());

-- 查询上年数据

select fullName,addedTime FROM t_user where year(addedTime)=year(date_sub(now(),interval 1 year));

-- 查询距离当前现在6个月的数据

select fullName,addedTime FROM t_user where addedTime between date_sub(now(),interval 6 month) and now();


-- 查询当前这周的数据

SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now());

-- 查询上周的数据

SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now())-1;

-- 查询上个月的数据

select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m');

-- 查询当前月份的数据

select fullName,addedTime FROM t_user where DATE_FORMAT(addedTime,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m');

select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(now(),'%Y-%m');


-- 查询指定时间段的数据

select fullName,addedTime FROM t_user where addedTime between  '2017-1-1 00:00:00'  and '2018-1-1 00:00:00';

select fullName,addedTime FROM t_user where addedTime >='2017-1-1 00:00:00'  and addedTime < '2018-1-1 00:00:00';

https://www.cnblogs.com/kenx/p/15211450.html