sql语句查询表的字段类型长度和表说明

打开查询分析器，执行下面的代码就可以了， 不需要修改任何地方。

 

SELECT sysobjects.name AS 表名, syscolumns.name AS 列名,
systypes.name AS 数据类型, syscolumns.length AS 数据长度, CONVERT(char,
sysproperties.[value]) AS 注释
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 CONVERT(char,sysproperties.[value]) <> 'null' --导出注释不为'null'的记录
--AND (sysobjects.name = 'bbs_bank_log') --逐个关联表名，可以用or连接条件
ORDER BY 表名

 

 

如果需要查询指定表的指定列可以添加查询条件：

and sysobjects.name='指定表名称' and syscolumns.name='指定列名'

 

修改字段属性：

ALTER TABLE table
{ [ ALTER COLUMN column_name
    { new_data_type [ ( precision [ , scale ] ) ]
        [ COLLATE < collation_name > ]
        [ NULL | NOT NULL ]
        | {ADD | DROP } ROWGUIDCOL }
    ]
    | ADD
        { [ < column_definition > ]
        | column_name AS computed_column_expression
        } [ ,...n ]
    | [ WITH CHECK | WITH NOCHECK ] ADD
        { < table_constraint > } [ ,...n ]
    | DROP
        { [ CONSTRAINT ] constraint_name
            | COLUMN column } [ ,...n ]
    | { CHECK | NOCHECK } CONSTRAINT
        { ALL | constraint_name [ ,...n ] }
    | { ENABLE | DISABLE } TRIGGER
        { ALL | trigger_name [ ,...n ] }
}