SQL Server查询表结构信息

SQL Server查询表结构信息语句：

SELECT  obj.name 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 OUTER 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 OUTER JOIN dbo.syscomments comm ON col.cdefault = comm.id
        LEFT OUTER JOIN sys.extended_properties ep ON col.id = ep.major_id AND col.colid = ep.minor_id AND ep.name = 'MS_Description'
        LEFT OUTER JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id AND epTwo.minor_id = 0 AND epTwo.name = 'MS_Description'
WHERE   obj.name = 'TableName'
ORDER BY col.colorder