Sql Server 数据库扩展
1. 查询一个表的所有列名
------查询一个表的所有列名
Select Name FROM SysColumns Where id=Object_Id('Sys_User') select t.column_name from information_schema.columns t where t.table_name='Sys_User';
如图所示:
2. 查询一个表的所有字段的注释
------查询一个表的所有字段的注释
select value from sys.extended_properties where major_id = object_id ('Sys_User' );
如图所示:
3. 查询一个表的所有列名,字段的注释
------查询一个表的所有列名,字段的注释 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 = 'Sys_User'
4. 查询一个表的所有列名,数据类型
------查询一个表的所有列名,数据类型
select column_name,data_type from information_schema.columns where table_name = 'Sys_User'
如图所示:
5. 查询一个表的所有信息
------查询一个表的所有信息
select * FROM information_schema.columns where table_name = 'Sys_User'
6. sqlserver 查询某个表的列名称、说明、备注、类型等
------sqlserver 查询某个表的列名称、说明、备注、类型等 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
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