SQL Server中Table字典数据的查询SQL示例代码
前言
在数据库系统原理与设计（第3版）教科书中这样写道：
数据库包含4类数据：
1.用户数据
2.元数据
3.索引
4.应用元数据
其中，元数据也叫数据字典，定义如下：
下面这篇文章就来给大家分享一个关于查询SQL Server Table 结构的SQL 语句。
T-SQL 如下：
SELECT (case when a.colorder=1 then d.name else '' end) 表名,
a.colorder 字段序号,a.name 字段名,
(case when a.colorder=1 then isnull(f.value,'') else '' end) 表说明,
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '1'else '0' end)标识,
(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) 主键,b.name 类型,a.length 占用字节数,
COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when
a.isnullable=1 then '1'else '0' end) 允许空,
isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [说明]
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 nullWHERE d.name='DBA_Server' --如果只查询指定表,加上此条件，此案例为表DBA_Server
order by a.id,a.colorder
查询出的结果如下：
