SQL 语句查询数据库，表信息

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