数据库 发布日期:2024/12/26 浏览次数:1
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 null WHERE 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:
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对的支持。