查询表结构sql

 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, N'') 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, N'') AS 默认值
 FROM      syscolumns AS col LEFT OUTER JOIN
                 systypes AS t ON col.xtype = t.xusertype INNER JOIN
                 sysobjects AS obj ON col.id = obj.id AND obj.xtype = 'U' AND obj.status >= 0 LEFT OUTER JOIN
                 syscomments AS comm ON col.cdefault = comm.id LEFT OUTER JOIN
                 sys.extended_properties AS ep ON col.id = ep.major_id AND col.colid = ep.minor_id AND
                 ep.name = 'MS_Description' LEFT OUTER JOIN
                 sys.extended_properties AS epTwo ON obj.id = epTwo.major_id AND epTwo.minor_id = 0 AND
                 epTwo.name = 'MS_Description'
 WHERE   (obj.name = 'TB_ROOM_STATE')
 ORDER BY 序号