php的问题。我用的是mysql，若只显示今年的数据，表里时间格式是0000-00-00,sql语句该怎么写？

Posted 2023-03-20

貌似楼一的回答不行啊

查询本周记录
select * from ht_invoice_information where WEEKOFYEAR(create_date)=WEEKOFYEAR(NOW());
#查询上周记录
select * from ht_invoice_information where create_date>=date_add(now(),interval -(8 + weekday(now())) day)
and create_date<=date_add(now(),interval -(1 + weekday(now())) day);

#或者
select * from `ht_invoice_information` where WEEKOFYEAR(create_date)=WEEKOFYEAR(DATE_SUB(now(),INTERVAL 1 week));
#查询本月数据
select * from ht_invoice_information where MONTH(create_date)=MONTH(NOW()) and year(create_date)=year(now());
#查询上月数据
select * from ht_invoice_information where create_date<=last_day(date_add(now(),interval -1 MONTH))
and create_date>=DATE_FORMAT(concat(extract(year_month from date_add(now(),interval -1 MONTH)),'01'),'%Y-%m-%d');
#或者
select * from `ht_invoice_information` where MONTH(create_date)=MONTH(DATE_SUB(NOW(),interval 1 month))
and year(create_date)=year(now());
#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));

参考这个吧，很全了。 参考技术A select * from 表 where datepart(yy,日期)=2008
-- 这是sql语句 执行以下看看 参考技术B select * from 表 where year(日期)=2008 参考技术C SELECT * FROM table where SUBSTRING(shijian,1,4)='2010'

delphi连接mysql 我用的是libmysql.dll，请问该怎么设置utf-8，使得字段显示的中文不是乱码？

用unidac 在opentions的charset里直接设置就可以了
方便而且效率高 参考技术A 连接MySQL数据库由于在Delphi 7中并没有提供对应MySQL4.0以上版本的dbexpress另外，如果libmysql.dll的版本不对会出现"invalid username/password"的错误 参考技术B adboconnection 连接...