SqlServer查询数据表结构包括字段类型注释等

SQL Server元数据查询技巧

最新推荐文章于 2024-06-19 16:02:33 发布

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本文详细介绍了一种使用SQL查询来获取SQL Server中指定表的元数据信息的方法，包括表名、列名、数据类型、长度、小数位数、是否为主键、是否允许空等属性，为数据库管理及开发提供了实用的参考。


 SELECT CASE WHEN col.colorder = 1 THEN obj.name
             ELSE ''
        END AS 表名 ,
        col.colorder AS 序号 ,
        col.name AS 列名 ,
        ISNULL(ep.[value], '') AS 列说明 ,
        t.name AS 数据类型 ,
        col.length AS 长度 ,
        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,
        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'
             ELSE ''
        END AS 标识 ,
        CASE WHEN EXISTS ( SELECT   1
                           FROM     dbo.sysindexes si
                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id
                                                              AND si.indid = sik.indid
                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id
                                                              AND sc.colid = sik.colid
                                    INNER JOIN dbo.sysobjects so ON so.name = si.name
                                                              AND so.xtype = 'PK'
                           WHERE    sc.id = col.id
                                    AND sc.colid = col.colid ) THEN '√'
             ELSE ''
        END AS 主键 ,
        CASE WHEN col.isnullable = 1 THEN '√'
             ELSE ''
        END AS 允许空 
        --ISNULL(comm.text, '') AS 默认值
 FROM   dbo.syscolumns col
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
        INNER JOIN dbo.sysobjects obj ON col.id = obj.id
                                         AND obj.xtype = 'U'
                                         AND obj.status >= 0
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                 AND col.colid = ep.minor_id
                                                 AND ep.name = 'MS_Description'
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                    AND epTwo.minor_id = 0
                                                    AND epTwo.name = 'MS_Description'
 WHERE  obj.name = 'ProInAccrual'--表名  
  A_ContractInfo
 ORDER BY obj.name ,
        col.colorder;