i have the following code.
i already try'd some sulotions from the search option, but nothing helped.
all tables have a row called: user_id with data in it, but still the query gives false
The $user
variable has the value 29 and in my tables look like this:
+---------+---------+-------+-----------+
+ id | user_id | jaar + kenmerk |
+---------+---------+-------+-----------+
+ 1 | 29 | 2015 + standaard |
+---------+---------+-------+-----------+
$query = "SELECT buitenklimaat.user_id, kasklimaat.user_id, watermangement.user_id, energie.user_id FROM buitenklimaat, kasklimaat, watermangement, energie WHERE user_id = ".$user." AND kenmerk = 'standaard' AND jaar = ".date("Y")."";
$result = mysqli_query($conn, $query);
if($result === false) {
echo 'Query failed';
die();
}
else {
// do something
}