<经验杂谈>查询表结构的SQL语句

在我们使用SQL数据库的过程中，经常会遇到查询表结构的情况，以下就是sql语句的写法：

--查询非系统数据库

SELECT name
FROM Master..SysDatabases
WHERE dbid > 4

查询数据库下所有表

 SELECT name
 FROM   sysobjects
 WHERE  xtype = ‘U‘
        OR xtype = ‘S‘

查询所有用户表

 SELECT name
 FROM   sysobjects
 WHERE  xtype = ‘U‘
        AND OBJECTPROPERTY(id, ‘IsMSShipped‘) = 0 

查询表的相关信息（字段名、长度、类型、字段说明）

SELECT a.[name] AS ‘字段名‘ ,
        a.length ‘长度‘ ,
        c.[name] ‘类型‘ ,
        e.value AS ‘字段说明‘
 FROM   syscolumns a
        LEFT   JOIN systypes b ON a.xusertype = b.xusertype
        LEFT     JOIN systypes c ON a.xtype = c.xusertype
        INNER   JOIN sysobjects d ON a.id = d.id
                                     AND d.xtype = ‘U‘
        LEFT JOIN sys.extended_properties e ON a.id = e.major_id
                                               AND a.colid = e.minor_id
                                               AND e.name = ‘MS_Description‘
 WHERE  d.name = ‘Comment‘