//取毫秒级时间精度(方法一): var t1,t2:int64; r1:int64; begin t1:=GetTickCount;//获取开始计数 WINDOWS API sleep(1000);{do...}//执行要计时的代码 t2:=GetTickCount;//获取结束计数值 r1:=t2-t1;//取得计时时间,单位毫秒(ms) ShowMessage(inttostr(r1)); end; //取毫秒级时间精度(方法二): //use DateUtils;//引用DateUtil
原文地址:https://www.cnblogs.com/zhangpengnike/p/6122588.html 一.统计语句 1.--统计当前[>当天00点以后的数据] SELECT * FROM 表 WHERE CONVERT(Nvarchar, dateandtime, 111) = CONVERT(Nvarchar, GETDATE(), 111) ORDER BY dateandtime DESC 2.--统计本周 SELECT * FROM 表 WHERE datediff(wee
http://publib.boulder.ibm.com/infocenter/idshelp/v115/index.jsp?topic=/com.ibm.sqls.doc/ids_sqs_0187.htm List of Expressions Each category of SQL expression includes many individual expressions. The following table lists all the SQL expressions (and