求救！MSSQL如何取得默认值！
做了一个数据导出功能
现在就差默认值问题了
现在可以查询出那个字段是有默认约束的
但是具体值是多少怎么取得？
而且有的字段是Datetime类型的   有的字段是int的

------解决方案--------------------
SELECT
表名=case when a.colorder=1 then d.name else ' ' end,
字段序号=a.colorder,
字段名=a.name,
标识=case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity ')=1 then '√ 'else ' ' end,
主键=case when exists(SELECT 1 FROM sysobjects where xtype= 'PK ' and name in (
SELECT name FROM sysindexes WHERE indid in(
SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
))) then '√ ' else ' ' end,
类型=b.name,
占用字节数=a.length,
长度=COLUMNPROPERTY(a.id,a.name, 'PRECISION '),
小数位数=isnull(COLUMNPROPERTY(a.id,a.name, 'Scale '),0),
允许空=case when a.isnullable=1 then '√ 'else ' ' end,
默认值=isnull(e.text, ' '),
字段说明=isnull(g.[value], ' ')
FROM syscolumns a
left join systypes b on a.xtype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype= 'U ' and d.name <> 'dtproperties '
left join syscomments e on a.cdefault=e.id
left join sysproperties g on a.id=g.id and a.colid=g.smallid
where d.name= ' ' --表名
order by a.id,a.colorder