SQL排序问题

 ''按多个字段排序
 Select * From Job order by job desc,id asc

 ''按首字符(非数字)排序
 Select * From Job order by case when isnumeric(left(jobno,1))=0
 Then left(jobno,1) end

 ''按首字符分组
 Select count(jobno) From Job group by left(jobno,1)

 ''合并Order by排序语句
 SELECT * FROM
 (Select TOP 200000 * From Job Where  jobno not like '[0-9]%' order by Jobno desc) A
 UNION ALL
 SELECT * FROM
 (Select TOP 200000 * From Job Where  jobno like '[0-9]%' order by ID desc) B