oracl 和db2 常用语法比较： 1、取前N条记录 Oracle：Select * from TableName where rownum <= N; DB2：Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle：Select sysdate from dual; DB2：Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle：Select
SQL sever 2008 Rar! ?s X<t ? ? ? ?祕BwL0 17240671-1.sql ?0) GO ALTER TABLE Product ADD CONSTRAINT CK_Product_Price CHECK(Price>0) GO ALTER TABLE Proln ADD CONSTRAINT CK_Proln_Quantity CHECK (Quantity>0) GO ALTER TABLE ProOut ADD CONSTRAINT C
如下所示：
#include
using namespace std;
class Date
{
public:
Date(int year = 1900, int month = 1, int day = 1) //构造
:_year(year)
, _month(month)
, _day(day)
{
if (!isInvalidDate(_year, _month, _day))
{
_year = 1900;
_month
