mysql - Mysql 查询删除一个零。得到（例如）75.5 英镑而不是 75.50 英镑？

Question

自从我的第一个问题以来，我一直在研究/试图解决这个问题......查询正在删除总列中的尾随“0”。我试过AS DECIMAL但FORMAT没有成功 - 我猜我把括号放在错误的地方？？

SELECT start_date AS 
START , end_date AS 
STOP , Activity, TIME_FORMAT( TIMEDIFF( end_date, start_date ) ,  '%h %i' ) AS Hours, CONCAT(  '£', rate ) AS Rate, CONCAT(  '£', FORMAT( TIMESTAMPDIFF( 
MINUTE , start_date, end_date ) * ( rate /60 ) , 2 ) ) AS Amount, 
COMMENT , CONCAT(  '£', expenses ) AS Expenses, CONCAT(  '£', FORMAT( TIMESTAMPDIFF( 
MINUTE , start_date, end_date ) * ( rate /60 ) , 2 ) + expenses ) AS total
FROM hours
JOIN activities ON hours.Activity = activities.description
WHERE Activity !=  "Caravan Park"
ORDER BY  `hours`.`end_date` DESC 

以上是代码 - 除了正确显示总列之外，我想要做的一切。这并不完全正确 - 我如何使用SUM()来获取计算列“总计”的列总计。那个解决方案让我望而却步！

非常感谢所有回复......