如何在获取值后关闭它们[关闭]

I have fetched some values form database

$sql = "select today earning form sql where username =$username date= today"

The data in return will be dynamic as I don't know how many rows it will produce

I want to display a table of record to the user like the one below

date:today earning 100

date:today earning 200

date:today earning 11

date:today earning 1

Total earning today 312

So the actual question is as I don't know how many rows will be there how to count the total value of today earnings?

try this one

SELECT SUM(today tearning) FROM `sql` WHERE username =$username date= now();
SELECT SUM(today_earning) FROM sql WHERE username='username' date= now()