自:合江荔枝网SQL语句SQL语法大全目录创建数据库···································································································-1-删除数据库···································································································-1-备份sqlserver·····························································································-1-创建新表······································································································-1-创建序列······································································································-1-删除新表······································································································-2-增加一个列···································································································-2-添加主键······································································································-2-创建索引······································································································-2-创建视图······································································································-2-几个简单的基本的sql语句··············································································-2-几个高级查询运算词······················································································-3-使用外连接···································································································-4-判断数据库是否存在······················································································-4-判断表是否存在·····························································································-4-判断存储过程是否存在···················································································-4-判断临时表是否存在······················································································-4-判断视图是否存在··························································································-4-判断函数是否存在·····································································