SQL语句获取所有数据库名、表名、字段名、表字段长度

转自：http://blog.csdn.net/mypc2010/article/details/7976292?cmp=dwskl&cpb=dw&ct=dwcon&cr=cn_CSDN_cs&ccy=cn

获取数据库中所有的表

SELECT SysObjects.name AS Tablename FROM sysobjects WHERE xtype = 'U'

获取数据库中所有表的列名

SELECT SysColumns.name AS Columnsname, SysObjects.name AS Tablename FROM SysObjects, SysColumns WHERE Sysobjects.Xtype='u' AND Sysobjects.Id=Syscolumns.Id

获取SQL所有数据库名、所有表名、所有字段名、表字段长度

1.获取MSSQL中的所有数据库名:

SELECT name FROM MASter..SysDatabASes ORDER BY name

2.获取MSSQL中的所有用户表名:

SELECT name FROM DatabASename..SysObjects WHERE XType='U' ORDER BY name

XType='U':表示所有用户表;

XType='S':表示所有系统表;

3.获取指定表[tb_phone]的所有字段名:

SELECT name FROM SysColumns WHERE id=Object_Id('tb_phone')

4.SQL所有表的表名、所有字段名、表字段长度

SELECT table_name AS 数据表名,

column_name AS 字段名,

ISNULL(column_default,'') AS 默认值,

is_nullable AS 是否允许为NULL,

data_type AS 数据类型,

ISNULL(ISNULL(ISNULL(character_maximum_length,numeric_precision),datetime_precision),1) AS 类型长度

FROM information_schema.columns

WHERE NOT table_name IN('sysdiagrams','dtproperties')

5.获取指定表[tb_phone]的表名，表字段名，字段类型和类型长度

SELECT SysObjects.name AS Tablename,

Syscolumns.name AS Columnsname,

Systypes.name AS DateType,

Syscolumns.length AS DateLength

FROM Sysproperties RIGHT OUTER JOIN

Sysobjects INNER JOIN

Syscolumns ON Sysobjects.id = Syscolumns.id INNER JOIN

Systypes ON Syscolumns.xtype = Systypes.xtype ON

Sysproperties.id = Syscolumns.id AND

Sysproperties.smallid = Syscolumns.colid

WHERE (Sysobjects.xtype = 'u' OR

Sysobjects.xtype = 'v') AND (Systypes.name <> 'Sysname') AND

(Sysobjects.name = 'tb_phone')

ORDER BY Columnsname