如何取得一个字段的长度，精度，类型

[duan17]

rt

[jinjazz]

sp_MShelpcolumns tablename

[hwcqboy]

select * from syscolumns 这个表里有你要的东西

[july]

select * from syscolumns 当然你还需要研究一下其他的相关系统表

[JasonHeung]

SELECT NAME,ID,XTYPE,TYPESTAT,XUSERTYPE,LENGTH,COLID,XPREC,XSCALE,COLSTAT,ISOUTPARAM FROM SYSCOLUMNS
WHERE ID = @TABLEID

[631799]

--方法一：
select column_name from information_schema.columns where table_name='你的表名'


--方法二：
select a.name from syscolumns a,sysobjects b where a.id=b.id and b.name='要查询的表'


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 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