前言

在數據庫系統原理與設計（第3版）教科書中這樣寫道：

數據庫包含4類數據：

1.用戶數據

2.元數據

3.索引

4.應用元數據

其中，元數據也叫數據字典，定義如下：

下面這篇文章就來給大家分享一個關于查詢SQL Server Table 結構的SQL 語句。

T-SQL 如下：

SELECT (case when a.colorder=1 then d.name else ” end) 表名,
a.colorder 字段序號,a.name 字段名,
(case when a.colorder=1 then isnull(f.value,”) else ” end) 表說明,
(case when COLUMNPROPERTY( a.id,a.name,’IsIdentity’)=1 then ‘1’else ‘0’ end)標識,
(case when (SELECT count(*) FROM sysobjects
WHERE (name in (SELECT name FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a.name)))))))
AND (xtype = ‘PK’))>0 then ‘1’ else ‘0’ end) 主鍵,b.name 類型,a.length 占用字節(jié)數,
COLUMNPROPERTY(a.id,a.name,’PRECISION’) as 長度,
isnull(COLUMNPROPERTY(a.id,a.name,’Scale’),0) as 小數位數,(case when
a.isnullable=1 then ‘1’else ‘0’ end) 允許空,
isnull(e.text,”) 默認值,isnull(g.[value], ‘ ‘) AS [說明]
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
–where b.name is not null
WHERE d.name=’DBA_Server’ –如果只查詢指定表,加上此條件，此案例為表DBA_Server
order by a.id,a.colorder