mysql查詢特定時間段內的資料

建表語句：

set foreign_key_checks=0;  

-- ----------------------------  
-- table structure for t_user  
-- ----------------------------  
drop table if exists `t_user`;  
create table `t_user` (  
`userid` bigint(20) not null,  
`fullname` varchar(64) not null,  
`usertype` varchar(16) not null,  
`addedtime` datetime not null,  
primary key (`userid`)  
) engine=innodb default charset=utf8;  
-- ----------------------------  
-- records of t_user  
-- ----------------------------  
insert into `t_user` values ('1', '爽爽', '普通', '2018-01-21 10:20:09');  
insert into `t_user` values ('2', '貴貴', '普通', '2017-11-06 10:20:22');  
insert into `t_user` values ('3', '芬芬', 'vip', '2017-11-13 10:20:42');  
insert into `t_user` values ('4', '思思', 'vip', '2018-01-21 10:20:55');  
insert into `t_user` values ('5', '妍妍', 'vip', '2017-09-17 10:21:28');

-- 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; 
-- 查詢本季度資料  
select fullname,addedtime from t_user where quarter(addedtime)=quarter(now()); 
-- 查詢上季度資料  
select fullname,addedtime from t_user where quarter(addedtime)=quarter(date_sub(now(),interval 1 quarter));  
-- 查詢本年資料  
select fullname,addedtime from t_user where year(addedtime)=year(now());  
-- 查詢上年資料  
select fullname,addedtime from t_user where year(addedtime)=year(date_sub(now(),interval 1 year));  
-- 查詢距離當前現在6個月的資料  
select fullname,addedtime from t_user where addedtime between date_sub(now(),interval 6 month) and now();  
-- 查詢當前這週的資料  
select fullname,addedtime from t_user where yearweek(date_format(addedtime,'%y-%m-%d')) = yearweek(now());  
-- 查詢上週的資料  
select fullname,addedtime from t_user where yearweek(date_format(addedtime,'%y-%m-%d')) = yearweek(now())-1;  
-- 查詢上個月的資料   
select fullname,addedtime from t_user where date_format(addedtime,'%y-%m')=date_format(date_sub(curdate(), interval 1 month),'%y-%m'); 
-- 查詢當前月份的資料
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'); 
-- 查詢指定時間段的資料
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';

1、查詢時間段內的資料，一般可以用between and 或 <> 來指定時間段。

2、mysql的時間字段型別有：datetime，timestamp，date，time，year。 

3、 獲取系統當前時間的函式：

select curdate();

select now();

period_diff()    datediff(date1,date2)      timediff(time1,time2)

date_sub() 

date_add()     adddate()      addtime()
period_add(p,n)

date_format(date, format) ，mysql日期格式化函式date_format()

unix_timestamp() 
str_to_date(str, format) 
from_unixtime(unix_timestamp, format) ，mysql時間戳格式化函式from_unixtime

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