数据库中SQL查询指定日期内数据

MySQL数据库：

有时我们面要统计一下数据库中指定日期的数据，如常用的，今天，昨天，明天，本周、上周、本月、上个月份的数据，除了我们可以使用strtotime来算还可以参考下面方法。

今天   select * from 表名 where to_days(时间字段名)=to_days(now());

昨天 SELECT * FROM `表名` where TO_DAYS(NOW()) – TO_DAYS(时间字段名) = 1;

　　/*DATEDIFF(now() , FROM_UNIXTIME(`时间字段名`)) = 1; //时间字段 存储类型为时间戳*/

7天 SELECT * FROM `表名` where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名);

　 　/*DATEDIFF(now() , FROM_UNIXTIME(`时间字段名`)) = 7; //时间字段 存储类型为时间戳*/

近30天 SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名);

　　    本月 SELECT * FROM 表名 WHERE DATE_FORMAT(时间字段名, "%Y%m" = DATE_FORMAT(CURDATE(), "%Y%m";

查询当前这周的数据 

SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,"%Y-%m-%d")) = YEARWEEK(now()); 

查询上周的数据

SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,"%Y-%m-%d")) = YEARWEEK(now())-1; 

查询当前月份的数据

select name,submittime from enterprise   where date_format(submittime,"%Y-%m")=date_format(now(),"%Y-%m") 

查询距离当前现在6个月的数据

select name,submittime from enterprise where submittime between date_sub(now(),interval 6 month) and now(); 

查询上个月的数据

select name,submittime from enterprise   where date_format(submittime,"%Y-%m")=date_format(DATE_SUB(curdate(), INTER VAL 1 MONTH),"%Y-%m") 
   
select * from `user` where DATE_FORMAT(pudate,"%Y%m") = DATE_FORMAT(CURDATE(),"%Y%m") ; 
  
select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,"%y-%m-%d")) = WEEKOFYEAR(now()) 
  
select *  from user where MONTH(FROM_UNIXTIME(pudate,"%y-%m-%d")) = MONTH(now()) 
  
select *  from [user]  where YEAR(FROM_UNIXTIME(pudate,"%y-%m-%d")) = YEAR(now()) 
and MONTH(FROM_UNIXTIME(pudate,"%y-%m-%d")) = MONTH(now()) 

从指定日期中获取部分数据：

如月份：

select to_CHAR(sysdate,"MM") FROM DUAL;

或者：

select extract(month from sysdate) from dual;