PHP Mysql WHERE clause not working -


i have query below doesn't seem work. in 1 blow wanted update rows who's current price not equal temporary price. want column prevprice copy or same column currprice.

it not give errors, never updates prevprice.

$previousprices = mysqli_query($conn,"update allproducts temporaryprice != currprice set prevprice=currprice");

set comes before where

update allproducts set prevprice = currprice temporaryprice != currprice

and, yes, != valid mysql:

http://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_not-equal


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