使用在UNION ALL

Question

我有一个查询

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

用户名的启动顺序从1000

当我使用这个查询它总是显示最高的用户名，以最小的用户名

我想显示最小用户名到最高用户名

我为此做了什么？

Answer 1

尝试通过在子查询包裹的，

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