php - SQL Update Query - Attempt to put 0 in a field -

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i'm using following update row in sql server database:

"update bmraconfig     set     [pn operator] = '".$pnop."',     [pn value] = '".$pnvalue."',     [mel operator] = '".$melop."',     [mel value] = '".$melvalue."',     [ndz operator] = '".$ndzop."',     [ndz value] = '".$ndzvalue."',     [fuel type] = '".htmlentities($fueltype, ent_quotes)."'          [pn operator] = '".$default["pnop"]."'     ";

however when 1 of variables equal 0, example $melvalue == 0, field isn't updated. if value 51 example change, not when it's 0.


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