高分呼救：关于组合的查询问题！！！！！！！！！

[wangmuzi]

可不可以通过列的ID来查询

比如说我知道列'Test6'是表'MyTable'中的第6列，那么我通过这个Column_id也就是6来查询，而不是通过列名'Test6'来进行查询，

或者有没有什么方法让SQL语句知道('Test'+'6')是个列名而不是一个char值'Test6'

[txlicenhe]

参考这个：
SELECT
(case when a.colorder=1 then d.name else '' end) N'表名',
a.colorder N'字段序号',
a.name N'字段名',
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) N'标识',
(case when (SELECT count(*)
FROM sysobjects
WHERE (name in
(SELECT name
FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid
FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid
FROM syscolumns
WHERE (id = a.id) AND (name = a.name))))))) AND
(xtype = 'PK'))>0 then '√' else '' end) N'主键',
b.name N'类型',
a.length N'占用字节数',
COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'长度',
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as N'小数位数',
(case when a.isnullable=1 then '√'else '' end) N'允许空',
isnull(e.text,'') N'默认值',
isnull(g.[value],'') AS N'字段说明'
--into ##tx

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
order by object_name(a.id),a.colorder

[Rotaxe]

可以用动态sql
参考http://expert.csdn.net/Expert/topic/2364/2364046.xml?temp=8.358401E-02

[LoveSQL]

使用动态的sql语句。。
exec('select test'+@Column_id+' from yourtable')

[gmlxf]

http://www.algonet.se/~sommar/dynamic_sql.html

[brook_huang]

同意上面兄弟。

[zjcxc]

--动态SQL就可以.

--例子:
declare @i int,@s varchar(8000)
set @i=6 --要查询的列
select @s='select ['+name+'] from mytable' from syscolumns where object_id('mytable')=id and colid=@i
exec(@s)