SELECT * FROM INFORMATION_SCHEMA.columns WHERE TABLE_NAME=‘Account‘SELECT    (case when a.colorder=1 then d.name else ‘‘ end) as 表名,--如果表名相同就返回空       a.colorder as 字段序号,       a.name as 字段名,       (case when COLUMNPROPERTY( a.id,a.name,‘IsIdentity‘)=1 then ‘√‘else ‘‘ end) as 标识,       (case when (SELECT count(*) FROM sysobjects--查询主键                       WHERE (name in                               (SELECT name FROM sysindexes                                WHERE (id = a.id)  AND (indid in                                       (SELECT indid FROM sysindexkeys                                         WHERE (id = a.id) AND (colid in                                           (SELECT colid FROM syscolumns                                           WHERE (id = a.id) AND (name = a.name))                           )))))            AND (xtype = ‘PK‘))>0 then ‘√‘ else ‘‘ end) as 主键,--查询主键END   b.name as 类型,   a.length as 占用字节数,   COLUMNPROPERTY(a.id,a.name,‘PRECISION‘) as  长度,   isnull(COLUMNPROPERTY(a.id,a.name,‘Scale‘),0) as 小数位数,   (case when a.isnullable=1 then ‘√‘else ‘‘ end) as 允许空,   isnull(e.text,‘‘) as 默认值,   isnull(g.[value],‘‘) AS 字段说明    FROM syscolumns a left join systypes b    on a.xtype=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    order by a.id,a.colorder   查询数据库里所有表名和字段名的语句SQL 查询所有表名：SELECT NAME FROM SYSOBJECTS WHERE TYPE=‘U‘SELECT * FROM INFORMATION_SCHEMA.TABLES查询表的所有字段名：SELECT NAME FROM SYSCOLUMNS WHERE ID=OBJECT_ID(‘ 表名‘ )SELECT * FROM INFORMATION_SCHEMA.TABLESSELECT * FROM INFORMATION_SCHEMA.VIEWSSELECT * FROM INFORMATION_SCHEMA.COLUMNSORACLE 查看所有表名:SELECT TABLE_NAME FROM USER_TABLESACCESS 查看所有表名：SELECT NAME FROM MSYSOBJECTS WHERE TYPE=1 AND FLAGS=0MSYSOBJECTS 是系统对象，默认情况是隐藏的。通过工具、选项、视图、显示、系统对象可以使之显示出来。