mysql 判断时间 语法

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  
7天  
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)  
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' )  
上一月  
SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( 时间字段名, '%Y%m' ) ) =1  
#查询本季度数据  
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(now());  
#查询上季度数据  
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));  
#查询本年数据  
select * from `ht_invoice_information` where YEAR(create_date)=YEAR(NOW());  
#查询上年数据  
select * from `ht_invoice_information` where year(create_date)=year(date_sub(now(),interval 1 year));  
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();  

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原文：https://blog.csdn.net/classabcd/article/details/83509941