mysql - 通过忽略日期中的时间部分来显示数据

Question

我正在使用JasperReports/iReport来制作我的报告。我已经编写了一个查询，让客户端键入日期，但有 1 个问题，日期是与时间部分一起出现的。

如何忽略客户端输入数据的时间部分？

date                            rate
2/2/2014  12:56:21.0000 PM      ABC   
4/2/2014  12:56:21.0000 PM      EFG
5/2/2014  12:56:21.0000 PM      HIJ
...

I have assign from customer to design with the parameter of year,month, and day.In other words, when the customer key in the year,month,and day, the data will show this way:

2/2/2014  12:56:21.0000 PM      ABC

The query i have wrote is show below:

select date,rate 
  from mytable
 where rownum=1 
       and tran_dt<=(select date 
                       from mytable 
                      where year(date)=$P{year} 
                            and month(date)=$P{month} 
                            and day(date)=$P{day}
                     )
order by 
       date

我正在使用 pl/sql 查询...

Answer 1

SQL 服务器:

使用这个

 select convert(varchar(10), '2011-02-25 21:17:33.933', 120)

像这样

 Select DATE_FORMAT(date,'%y-%m-%d'),rate from mytable
where rownum=1 and tran_dt<=(select tran_dt from bi01_trandetail where
year(date)=$P{year} and month(tran_dt)=$P{month} and day(tran_dt)=$P{day})
order by date

MYSQL

使用

 DATE_FORMAT(date,'%y-%m-%d')


   Select DATE_FORMAT(date,'%y-%m-%d'),rate from mytable
   where rownum=1 and tran_dt<=(select tran_dt from bi01_trandetail where
   year(date)=$P{year} and month(tran_dt)=$P{month} and day(tran_dt)=$P{day})
   order by date

或者

SELECT DATE('2003-12-31 01:02:03');
'2003-12-31'



  Select date(date),rate from mytable
   where rownum=1 and tran_dt<=(select tran_dt from bi01_trandetail where
   year(date)=$P{year} and month(tran_dt)=$P{month} and day(tran_dt)=$P{day})
   order by date

您的新查询:

select date,rate 
  from mytable
 where rownum=1 
       and tran_dt<=(select DATE_FORMAT(date,'%y-%m-%d') 
                       from mytable 
                      where year(date)=$P{year} 
                            and month(date)=$P{month} 
                            and day(date)=$P{day}
                     )
order by 
       date

MYSQL DATE FUNCTION