MySql PHP Add Values from fields

Question

Scenario:

I have a MySql Database called "tblreqslipdetails" it has a field "subtotals" which has a value = Integer (ex. 4500.50, 2500, 3500.57.. so on..) it also has a field which has "idcategory" which has a value of (2, or 4 or 5).

Question:

How can I create a query base on my "idcategory" and add the value in my field "subtotals"?

Like:

From Where ID="idcategory" add array??? "not sure really" "subtotal" = Total

To cut it short, I would like to create a simple script where I can add the subtotals from my fields..

Thanks in advance.

Answer 1

就像Vijay所说的，我认为您正在寻找更新。

UPDATE `tblreqslipdetails` SET `subtotals`=`subtotals`+2000 WHERE `idcategory`=2