将数学函数应用于另一个数学函数

Question

我被要求写一份声明，其中包含以下内容：＆＃34;通过权力2增加资金然后除以2.将结果四舍五入到＃34;。

这是table

这是我到目前为止所得到的

SELECT event_id, place, money, 
POWER(money,2)/2 as x,
ROUND(x,0) as 'new money'
FROM PRIZE 
ORDER BY event_id, place; 

我无法弄清楚如何在同一声明中对x进行舍入 - 我猜这个值还没有被创建？

由于

Answer 1

只需嵌套函数调用。

SELECT event_id, place, money, 
ROUND(POWER(money,2)/2,0) as 'new money'
FROM PRIZE 
ORDER BY event_id, place; 

Answer 2

你可以使用子查询，

SELECT *, ROUND(x,0) as 'new money' 
FROM ( 
    SELECT *, POWER(money,2)/2 as x from PRIZE
) as TABLE1

ORDER BY event_id, place