前言导读
本章收集了一些查询sqlsever2008数据库表信息的功能,
通过这些功能可以查看到很多隐藏的表格信息.

查询所有表，字段，说明等详细信息

1 查询数据库表说明：

select top 1000
  ROW_NUMBER() OVER (ORDER BY a.object_id) AS No, a.name AS 表名,  isnull(g.[value],'-') AS 说明
  
from sys.tables a left join sys.extended_properties g  on (a.object_id = g.major_id AND g.minor_id = 0)

2 查询表字段说明：

SELECT A.name AS table_name,B.name AS column_name,C.value AS column_description 

FROM sys.tables A INNER JOIN sys.columns B 

ON B.object_id = A.object_id LEFT JOIN sys.extended_properties C 

ON C.major_id = B.object_id AND C.minor_id = B.column_id 

WHERE A.name ='表名称'

3 查询数据库所有表名，object_id及创建时间

 select name,object_id,create_date 
 from sys.tables  
 order by create_date desc

4 查询数据库某张表所有字段及说明

select * 
from sys.extended_properties 
where major_id = object_id ('sys_user' );

5 查询数据库表名，表说明，字段等详细信息

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 
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='Sys_User'    --如果只查询指定表,加上此where条件，tablename是要查询的表名；去除where条件查询所有的表信息
order by 
    a.id,a.colorder

(本章完)

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