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,

     字段说明   = isnull(G.[value],''),

     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,'')

 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

 sys.extended_properties  G

 on

     A.id=G.major_id and A.colid=G.minor_id

 Left Join

 sys.extended_properties F

 On

     D.id=F.major_id and F.minor_id=0

     --where d.name='OrderInfo'    --如果只查询指定表,加上此条件

 Order By

     A.id,A.colorder

以下是MySql版本：

SELECT

 COLUMN_NAME 列名,

 COLUMN_TYPE 数据类型,

 DATA_TYPE 字段类型,

 CHARACTER_MAXIMUM_LENGTH 长度,

 IS_NULLABLE 是否为空,

 COLUMN_DEFAULT 默认值,

 COLUMN_COMMENT 备注

FROM

 INFORMATION_SCHEMA.COLUMNS

where

 table_schema ='数据库名称'

and table_name  = '表名称'