求教sql语句问题

Posted 2023-05-18

我在sqlserver2000查询分析器中输入以下语句

declare @name varchar(20)

set @name = 'roger'

运行后给出提示说“必须声明变量@name”，我若没声明变量那第一条语句干嘛吃了？求教！

我运行了，没有问题的

这两个语言你都选择上再点“运行”

要么就不要选择任何一句

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http://bbs.topsage.com/dispbbs.asp?boardID=122&ID=156454 参考技术A 你运行的时候可能把下面一行筐住了,它只运行了下面一行,你这2句一起运行是没有问题的本回答被提问者采纳 参考技术B 如果两句一起运行是不会有问题的，应该是你运行的时候运行方式错了。 参考技术C 你最好编个存储过程,
这样第一句就有用了

sql server 2000 如何改变 default属性

ALTER TABLE LACRIMOSA ALTER COLUMN CHEN SET DEFAULT 'CHEN' 我的语句是这么写的，为什么会提示：
服务器: 消息 156，级别 15，状态 1，行 1
在关键字 'SET' 附近有语法错误。
求教 。在建立表是时候是可以添加的 ，但是我想改变default值，就说我有问题

参考技术A 删除原有默认值约束语句,如果不知道现有约束的名称，可以在查询分析器里该表下面的约束里看到：
alter table 表名 drop constraint [已有默认约束名称]

增加默认值约束语句：
alter table 表名 add constraint [默认约束名称] default 默认值 for 字段名 参考技术B ALTER TABLE 表名 add DEFAULT ( '修改后的默认值 ') for 字段名 WITH VALUES

如果之前有了约束的话，应该先删除。追问

如何删除表中列的默认default值 ALTER TABLE 表 ALTER COLUNM 列名 DROP DEFAULT 这样好像打进去是错的

追答

ALTER TABLE dbo.t1
DROP CONSTRAINT DF_t1_fb

ALTER TABLE dbo.t1 ADD CONSTRAINT
DF_t1_fb DEFAULT (''b'') FOR fb

DF_t1_fb是自己随意取的