V_AllTable 表信息数据库 SQL2008-优快云博客

本文详细介绍了如何使用SQL查询获取表的元数据，包括字段名、数据类型、是否为主键、是否为唯一标识符、长度、是否允许为空、默认值、注释信息等，并按字段顺序排列。

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SELECT     TOP (100) PERCENT d.name AS TableName, a.colorder AS Orders, a.name AS FieldName,
            (CASE WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') = 1 THEN '√' ELSE '' END) AS Identitys,
            (CASE WHEN    (SELECT     COUNT(*) FROM    sysobjects 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 MainKey,
            b.name AS Types, a.length AS Bytes, COLUMNPROPERTY(a.id, a.name, 'PRECISION') AS Lengths,
            ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) AS DecimalLength,
            (CASE WHEN a.isnullable = 1 THEN '√' ELSE '' END) AS IS_NUll, ISNULL(e.text, '') AS Defaults, ISNULL(g.value, '') AS Field_Info,
            CASE d .xtype WHEN 'U' THEN 'Table' ELSE 'View' END AS Table_View, d.crdate AS CreateDate
            FROM         sys.syscolumns AS a LEFT OUTER JOIN       sys.systypes AS b ON a.xtype = b.xusertype INNER JOIN
            sys.sysobjects AS d ON a.id = d.id AND (d.xtype = 'U' OR d.xtype = 'V') AND d.name <> 'dtproperties' LEFT OUTER JOIN
            sys.syscomments AS e ON a.cdefault = e.id LEFT OUTER JOIN sys.extended_properties AS g ON a.id = g.major_id AND a.colid = g.major_id
            ORDER BY a.id, orders