日期和时间数据的处理. (1)字符串日期 ‘20080301’,这一串为字符串日期,但必须保证为四位的年份,两位的月份,两位的日期.例如,查询订单表日期大于‘20080301’.可以这样写: 1 select * from sales.orders 2 where orderdate>'20080301' 结果如图所示: (2)cast进行转化.例如,可以讲‘20080301’转化为时间类型.其结果跟上图一样. 1 select * from sales.orders 2 where order
NthDayOfWeek 计算并返回指定日期是该月第几周 Unit:DateUtils function NthDayOfWeek(const AValue: TDateTime): Word; Example: Uses SysUtils,DateUtils; Begin Write('Today is the ',NthDayOfWeek(Today),'-th '); Writeln(formatdateTime('dddd',Today),' of the month.');En
工作中经常会遇到,要在sql中查询报表,查询结果要求按照日期来罗列, 或按照天, 或按照月,年. 这个时候我们经常会苦恼,datetime是精确到毫秒的,如果单纯的group by datetime就会导致结果不正确. 这是我们可以利用convert函数: SELECT convert(varchar(10),CreateDate,120) ,var1 ,var2 FROM Table GROUP BY convert(varchar(10),CreateDate,120) ASC 第一个参数是
select * from table1 where larq between(to_date('2008-9-3','yyyy-mm-dd')) and (to_date('2008-9-5','yyyy-mm-dd')) 2.select * from table1 where larq>=to_date('2008-9-3','yyyy-mm-dd') and larq <=to_date('2008-9-5','yyyy-mm-dd') select count(1) from T_