参照文章（ mysql查询时间段内数据）进行了操作。
先来建表语句：
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SET FOREIGN_KEY_CHECKS=0;
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-- ----------------------------
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-- Table structure for t_user
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-- ----------------------------
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DROP TABLE IF EXISTS `t_user`;
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CREATE TABLE `t_user` (
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`userId` bigint(20) NOT NULL,
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`fullName` varchar(64) NOT NULL,
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`userType` varchar(16) NOT NULL,
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`addedTime` datetime NOT NULL,
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PRIMARY KEY (`userId`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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-- ----------------------------
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-- Records of t_user
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-- ----------------------------
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INSERT INTO `t_user` VALUES ('1', '爽爽', '普通', '2018-01-21 10:20:09');
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INSERT INTO `t_user` VALUES ('2', '贵贵', '普通', '2017-11-06 10:20:22');
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INSERT INTO `t_user` VALUES ('3', '芬芬', 'vip', '2017-11-13 10:20:42');
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INSERT INTO `t_user` VALUES ('4', '思思', 'vip', '2018-01-21 10:20:55');
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INSERT INTO `t_user` VALUES ('5', '妍妍', 'vip', '2017-09-17 10:21:28');
下面是sql语句：
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-- 今天
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select fullName,addedTime from t_user where to_days(addedTime) = to_days(now());
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-- 昨天
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select fullName,addedTime from t_user where to_days(NOW()) - TO_DAYS(addedTime) <= 1;
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-- 近7天
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select fullName,addedTime from t_user where date_sub(CURDATE(),INTERVAL 7 DAY) <= DATE(addedTime);
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-- 近30天
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SELECT fullName,addedTime FROM t_user where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(addedTime);
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-- 本月
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SELECT fullName,addedTime FROM t_user WHERE DATE_FORMAT( addedTime, '%Y%m' ) = DATE_FORMAT( CURDATE() , '%Y%m' );
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-- 上一月
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SELECT fullName,addedTime FROM t_user WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( addedTime, '%Y%m' ) ) =1;
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-- 查询本季度数据
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select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(now());
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-- 查询上季度数据
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select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));
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-- 查询本年数据
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select fullName,addedTime FROM t_user where YEAR(addedTime)=YEAR(NOW());
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-- 查询上年数据
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select fullName,addedTime FROM t_user where year(addedTime)=year(date_sub(now(),interval 1 year));
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-- 查询距离当前现在6个月的数据
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select fullName,addedTime FROM t_user where addedTime between date_sub(now(),interval 6 month) and now();
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-- 查询当前这周的数据
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SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now());
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-- 查询上周的数据
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SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now())-1;
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-- 查询上个月的数据
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select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m');
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-- 查询当前月份的数据
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select fullName,addedTime FROM t_user where DATE_FORMAT(addedTime,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m');
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select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(now(),'%Y-%m');
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-- 查询指定时间段的数据
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select fullName,addedTime FROM t_user where addedTime between '2017-1-1 00:00:00' and '2018-1-1 00:00:00';
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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：
select CURDATE();
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)
--------以上参考文章（mysql日期加减）
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
--------以上参考文章（MYSQL日期 字符串 时间戳互转）
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')
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