使用在UNION ALL

Question

我有一個查詢

select username,amount from employee 
union all 
select '' as username,sum(amount) from employee 
order by cast(username as decimal) 

用戶名的啓動順序從1000

當我使用這個查詢它總是顯示最高的用戶名，以最小的用戶名

我想顯示最小用戶名到最高用戶名

我爲此做了什麼？

Answer 1

嘗試通過在子查詢包裹的，

SELECT * 
FROM 
    (
     SELECT username, amount from employee 
     UNION ALL 
     SELECT '' as username, sum(amount) from employee 
    ) x 
ORDER BY (CASE WHEN username = '' THEN 1 ELSE 0 END) ASC, 
      CAST(username AS SIGNED) ASC