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[英]How can I count number of occurrence in one column and add the next respective column in MYSQL, PHP and present to datatable
[英]How to add a number to a column in PHP and MySQL?
如果值為5,我想加+1,結果為6。
<?php
$db = new PDO ( 'mysql:host=localhost;dbname=database;charset=utf8', 'sunyamacs', 'asd123123');
$db->setAttribute ( PDO::ATTR_ORACLE_NULLS, PDO::NULL_TO_STRING );
$qry = $db->prepare ( "UPDATE user_data SET value = :value" );
$qry->bindParam ( ':value', $db_data ['value'] );
$db_data ['value'] = $db_data ['value'] + 1;
?>
這是行不通的,但是怎么辦呢?
為此使用SQL:
UPDATE user_data SET value = value + 1 WHERE value = '5'
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