dongqieli4164 2013-07-23 10:57
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选择列的总和 - 几个变量

Here is what I have at the moment for my select statement:

$sql17="SELECT SUM(TotalProfit)-('$sum14','$sum13') AS TotalProfit FROM jwtdriversbank2";

I can subtract one variable like this with no problem:

$sql17="SELECT SUM(TotalProfit)-'$sum14' AS TotalProfit FROM jwtdriversbank2";

But I want to be able to subtract several variables, how can I do that????

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  • dounieqi6959 2013-07-23 10:59
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    Like this?

    $sql17="SELECT SUM(TotalProfit)-'$sum14'-'$sum13' AS TotalProfit FROM jwtdriversbank2";
    

    Be careful when you're constructing SQL queries by injecting variables directly like this though, use prepared statements where possible.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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