SQL語句獲取全部數據庫名、表名、字段名、表字段長度

SQL語句獲取全部數據庫名、表名、字段名、表字段長度

 

獲取數據庫中全部的表

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

獲取數據庫中全部表的列名

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

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獲取SQL全部數據庫名、全部表名、全部字段名、表字段長度

1.獲取MSSQL中的全部數據庫名:

SELECT name FROM MASter..SysDatabASes ORDER BY name

 

2.獲取MSSQL中的全部用戶表名:

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

XType='U':表示全部用戶表;

XType='S':表示全部系統表;

 

3.獲取指定表[tb_phone]的全部字段名:

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

 

4.SQL全部表的表名、全部字段名、表字段長度

SELECT table_name AS 數據表名,

column_name AS 字段名,

ISNULL(column_default,'') AS 默認值,

is_nullable AS 是否容許爲NULL,

 

data_type AS 數據類型,

ISNULL(ISNULL(ISNULL(character_maximum_length,numeric_precision),datetime_precision),1) AS 類型長度

FROM information_schema.columns

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

 

5.獲取指定表[tb_phone]的表名，表字段名，字段類型和類型長度

SELECT SysObjects.name AS Tablename,

Syscolumns.name AS Columnsname,

Systypes.name AS DateType,

Syscolumns.length AS DateLength

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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