先来建表语句：

SET FOREIGN_KEY_CHECKS=0;-- ----------------------------

-- Table structure fort_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‘, ‘贵贵‘, ‘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‘);

下面是sql语句：

-- 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‘;

归纳一下：

1、查询时间段内的数据，一般可以用between and 或 <> 来指定时间段。

2、mysql的时间字段类型有：datetime，timestamp，date，time，year。

3、 获取系统当前时间的函数：

selectCURDATE();select NOW();

4、获取时间差的函数：

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

5、日期加减函数：

date_sub()

date_add() adddate() addtime()

period_add(P,N)

6、时间格式转化函数：

date_format(date, format) ，MySQL日期格式化函数date_format()

unix_timestamp()

str_to_date(str, format)

from_unixtime(unix_timestamp, format) ，MySQL时间戳格式化函数from_unixtime

顺带写一下oracle的查询语句：

select * from Oracle.alarmLog where alarmtime between to_date(‘2007-03-03 18:00:00‘,‘yyyy-mm-dd hh24:mi:ss‘) and to_date(‘2007-09-04 18:00:00‘,‘yyyy-mm-dd hh24:mi:ss‘)