SQL查詢數據字典

SELECT  d.name AS 表名 ,
        f.value AS 表说明,
        字段序号 = a.colorder ,
        字段名 = a.name ,
        标识 = CASE WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') = 1 THEN '√'
                  ELSE ''
             END ,
        主键 = CASE WHEN EXISTS ( SELECT  1
                                FROM    sysobjects
                                WHERE   xtype = 'PK'
                                        AND name IN (
                                        SELECT  name
                                        FROM    sysindexes
                                        WHERE   indid IN (
                                                SELECT  indid
                                                FROM    sysindexkeys
                                                WHERE   id = a.id
                                                        AND colid = a.colid ) ) )
                  THEN '√'
                  ELSE ''
             END ,
        类型 = b.name ,
        占用字节数 = a.length ,
        长度 = COLUMNPROPERTY(a.id, a.name, 'PRECISION') ,
        小数位数 = ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) ,
        允许空 = CASE WHEN a.isnullable = 1 THEN '√'
                   ELSE ''
              END ,
        默认值 = ISNULL(e.text, '') ,
        字段说明 = ISNULL(g.[value], '')
FROM    syscolumns a
        LEFT   JOIN systypes b ON a.xtype = b.xusertype
        INNER   JOIN sysobjects d ON a.id = d.id
                                     AND d.xtype = 'U'
                                     AND d.name <> 'dtproperties'
        LEFT   JOIN syscomments e ON a.cdefault = e.id
        LEFT   JOIN sys.extended_properties g ON a.id = g.major_id
                                                 AND a.colid = g.minor_id
        LEFT   JOIN sys.extended_properties f ON d.id = f.major_id
                                                 AND f.minor_id = 0
WHERE   d.name = 'XXX'         --如果只查询指定表,加上此条件   
ORDER BY a.id ,
        a.colorder