前言導讀
本章收集了一些查詢sqlsever2008資料庫表資訊的功能,
通過這些功能可以檢視到很多隱藏的表格資訊.

查詢所有表，欄位，說明等詳細資訊

1 查詢資料庫表說明：

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

2 查詢表字段說明：

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 ='表名稱'

3 查詢資料庫所有表名，object_id及建立時間

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

4 查詢資料庫某張表所有欄位及說明

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

5 查詢資料庫表名，表說明，欄位等詳細資訊

SELECT 
    表名       = case when a.colorder=1 then d.name else '' end,
    表說明     = case when a.colorder=1 then isnull(f.value,'') else '' end,
    欄位序號   = a.colorder,
    欄位名     = a.name,
    標識       = case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
    主鍵       = 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,
    型別       = b.name,
    佔用位元組數 = a.length,
    長度       = COLUMNPROPERTY(a.id,a.name,'PRECISION'),
    小數位數   = isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
    允許空     = case when a.isnullable=1 then '√'else '' end,
    預設值     = isnull(e.text,''),
    欄位說明   = 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'    --如果只查詢指定表,加上此where條件，tablename是要查詢的表名；去除where條件查詢所有的表資訊
order by 
    a.id,a.colorder
 

(本章完)

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