---创建数据库 create database CRM; --删除数据库 drop database CRM; --创建一个表 if exists(select * from sysobjects where name='Users') drop table Users go create table Users( Id int identity(1,1) not null primary key, --顾客编号,主键 按一进行自动增长 UserName varchar(50)not nul
---创建数据库 create database CRM; --删除数据库 drop database CRM; --创建一个表 if exists(select * from sysobjects where name='Users') drop table Users go create table Users( Id int identity(1,1) not null primary key, --顾客编号,主键 按一进行自动增长 UserName varchar(50)not nul
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