判断字段的数据类型
请教，如何得到指定表所有列的数据类型

------解决方案--------------------
--查詢表結構
--引用：邹建

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= 'yourtablename '
order by a.ID,a.colorder
------解决方案--------------------

Select
A.Name As ColName,
B.Name As Type
From SysColumns A
Inner Join Systypes B
On A.Xtype = B.Xusertype
Where A.ID = OBJECT_ID(N 'TableName ')
------解决方案--------------------
以下为转贴:

SELECT
表名 = case when a.colorder=1 then d.name else ' ' end,
表说明 = case when a.colorder=1 then isnull(f.value, ' ') 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 parent_obj=a.id 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.xusertype=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
left join
sysproperties f
on
d.id=f.id and f.smallid=0
where
d.name= '要查询的表 ' --如果只查询指定表,加上此条件
order by
a.id,a.colorder