查sqlserver表结构说明的方法

USE database_name
GO

SELECT tab.name        AS tableName
FROM   sys.columns col
INNER JOIN sys.tables tab
ON col.object_id = tab.object_id
LEFT JOIN sys.extended_properties per
ON col.column_id = per.minor_id
AND per.major_id = tab.object_id
INNER JOIN sys.types type
ON col.user_type_id = type.user_type_id
group by tab.name
ORDER  BY tab.name

USE database_name
GO

SELECT tab.name        AS tableName,
col.name        AS column_name,
per.value       AS column_comment,
col.is_identity AS column_key,
type.name       AS data_type,
col.max_length  AS column_length
FROM   sys.columns col
INNER JOIN sys.tables tab
ON col.object_id = tab.object_id
LEFT JOIN sys.extended_properties per
ON col.column_id = per.minor_id
AND per.major_id = tab.object_id
INNER JOIN sys.types type
ON col.user_type_id = type.user_type_id
ORDER  BY tab.name,
col.is_identity DESC

USE database_name
GO
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.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 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
order by a.id,a.colorder