mysql 查询

查询当天数据

select * from tab where FROM_UNIXTIME(fabutime, '%Y%m%d') = 20121217;

mysql TO_DAYS(date) 函数

TO_DAYS(date)

给定一个日期date, 返回一个天数 (从年份0开始的天数 )。

mysql> SELECT TO_DAYS(950501);
 
-> 728779

mysql查询今天、昨天、7天、近30天、本月、上一月 数据
今天

select * from 表名 where to_days(时间字段名) = to_days(now());
``` 
昨天
``` bash
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));

更新某个字段中存在某字符串

UPDATE `web` SET `header_img`=REPLACE(`url`, 'httpss', 'https')  WHERE id IN (SELECT aid FROM (SELECT id AS aid  FROM `web` WHERE LOCATE('httpss://',`url`)>0 ) AS a );