(原创，呕心历血之作，强烈推荐)新旧库数据字典比较脚本

        /*新旧库数据字典比较脚本*/

--注明1：新旧库必须在同一数据库服务器同一实例中,最好以Sa身份登入。
--注明2：本脚本可作为系统升级改造，得到相关信息后作数据迁移之用。

declare @i int

set @i=4  /*注明3:1为要得到新库增加的数据字典信息;
                 2为要得到旧库多出的数据字典信息;
                 3为要得到新库增加的表的数据字典信息;
                 4为要得到旧库多出的表的数据字典信息 */               

use temp  --打开旧库
SELECT sysobjects.name AS [table], CASE WHEN CAST(sysproperties.[value] AS varchar)
      IS NULL THEN '' ELSE CAST(sysproperties.[value] AS varchar) END AS 表说明,
      syscolumns.name AS field, CASE WHEN CAST(properties.[value] AS varchar) IS NULL
      THEN '' ELSE CAST(properties.[value] AS varchar) END AS 字段说明,
      systypes.name AS type, syscolumns.length,
      ISNULL(COLUMNPROPERTY(syscolumns.id, syscolumns.name, 'Scale'), 0)
      AS 小数位数, syscolumns.isnullable AS isnull,
      CASE WHEN syscomments.text IS NULL
      THEN '' ELSE syscomments.text END AS [Default],
      CASE WHEN COLUMNPROPERTY(syscolumns.id, syscolumns.name, 'IsIdentity')
      = 1 THEN '√' ELSE '' END AS 标识, 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 = syscolumns.id AND colid = syscolumns.colid)))
      THEN '√' ELSE '' END AS 主键 into #old
FROM syscolumns INNER JOIN
      sysobjects ON sysobjects.id = syscolumns.id INNER JOIN
      systypes ON syscolumns.xtype = systypes.xtype LEFT OUTER JOIN
      sysproperties properties ON syscolumns.id = properties.id AND
      syscolumns.colid = properties.smallid LEFT OUTER JOIN
      sysproperties ON sysobjects.id = sysproperties.id AND
      sysproperties.smallid = 0 LEFT OUTER JOIN
      syscomments ON syscolumns.cdefault = syscomments.id
WHERE (sysobjects.xtype = 'U')

use *** --打开新库
SELECT sysobjects.name AS [table], CASE WHEN CAST(sysproperties.[value] AS varchar)
      IS NULL THEN '' ELSE CAST(sysproperties.[value] AS varchar) END AS 表说明,
      syscolumns.name AS field, CASE WHEN CAST(properties.[value] AS varchar) IS NULL
      THEN '' ELSE CAST(properties.[value] AS varchar) END AS 字段说明,
      systypes.name AS type, syscolumns.length,
      ISNULL(COLUMNPROPERTY(syscolumns.id, syscolumns.name, 'Scale'), 0)
      AS 小数位数, syscolumns.isnullable AS isnull,
      CASE WHEN syscomments.text IS NULL
      THEN '' ELSE syscomments.text END AS [Default],
      CASE WHEN COLUMNPROPERTY(syscolumns.id, syscolumns.name, 'IsIdentity')
      = 1 THEN '√' ELSE '' END AS 标识, 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 = syscolumns.id AND colid = syscolumns.colid)))
      THEN '√' ELSE '' END AS 主键 into #new
FROM syscolumns INNER JOIN
      sysobjects ON sysobjects.id = syscolumns.id INNER JOIN
      systypes ON syscolumns.xtype = systypes.xtype LEFT OUTER JOIN
      sysproperties properties ON syscolumns.id = properties.id AND
      syscolumns.colid = properties.smallid LEFT OUTER JOIN
      sysproperties ON sysobjects.id = sysproperties.id AND
      sysproperties.smallid = 0 LEFT OUTER JOIN
      syscomments ON syscolumns.cdefault = syscomments.id
WHERE (sysobjects.xtype = 'U') 

if @i=1
  begin
    select n.* --新库与旧库相比较后新库增加的数据字典信息
     from #new n left join #old o on n.[table]=o.[table] and n.field=o.field where o.[table] is null
    or o.field is null order by n.[table],n.field
  end
  else
   begin
     if @i=2
       begin
         select o.* --新库与旧库相比较后旧库多出的数据字典信息
          from #new n right join #old o on n.[table]=o.[table] and n.field=o.field where n.[table] is null
           or n.field is null order by o.[table],o.field
       end
       else
         begin
         if @i=3
           begin
             select * --新库与旧库相比较后新库增加的表的数据字典信息
             from #new where [table] <> all(select [table] from #old ) order by [table],field
           end
           else
             begin
              if @i=4
                begin
                  select * --新库与旧库相比较后旧库多出的表的数据字典信息
                  from #old where [table] <> all(select [table] from #new ) order by [table],field
                end
                else
                  begin
                    select '出错啦'
                  end    
             end    
         end   
   end

drop table #old
drop table #new