获取表主键

1:SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGEWHERE TABLE_NAME<>‘dtproperties‘
2:EXEC sp_pkeys @table_name=‘表名‘
3:

select o.name as 表名,c.name as 字段名,k.colid as 字段序号,k.keyno as 索引顺序,t.name as 类型

from sysindexes i

join sysindexkeys k on i.id = k.id and i.indid = k.indid

join sysobjects o on i.id = o.id

join syscolumns c on i.id=c.id and k.colid = c.colid

join systypes t on c.xusertype=t.xusertype

where o.xtype = ‘U‘ and o.name=‘要查询的表名‘

and exists(select 1 from sysobjects where xtype = ‘PK‘ and parent_obj=i.id and name = i.name)

order by o.name,k.colid

获取所有

SELECT
表名=case when a.colorder=1 then d.name else ‘‘ end,
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‘ and d.name = ‘要查询的表名‘
left join syscomments e on a.cdefault=e.id
left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id and g.name=‘MS_Description‘
order by a.id,a.colorder

获取表自增列名称 
SELECT COLUMN_NAME as 标识 FROM INFORMATION_SCHEMA.columns

WHERE TABLE_NAME=‘表名‘ AND COLUMNPROPERTY(OBJECT_ID(‘表名‘),COLUMN_NAME,‘IsIdentity‘)=1

获取字段默认值

select b.text as 字段默认值
from syscolumns a left join syscomments b on a.cdefault = b.id
where a.id = object_id(‘表名‘) and a.name = ‘字段名称‘