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= then d.name else '' end,
    表说明     = case when a.colorder= 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')= then '√'else '' end,
    主键       = case when exists(SELECT  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'),),
    允许空     = case when a.isnullable= 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=
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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