Question

I have databases called Over_Pics (with a table called “Pic” with Columns ID, PicID) and Over_SeenPics (with a table called “Seen” with Columns Text, PicID)

How do I correctly write the join function for this?

$r = mysqli_query($link, "SELECT Pic.PicID FROM Pic LEFT JOIN Seen ON Pic.PicID=Seen.PicID");

Also should the db name in mysqil_connect be left blank, since I need to access to dbs rather than 1?

Answer 1

I think you just need to specify the DB before the table names, like this:

$r = mysqli_query($link, "SELECT Over_Pics.Pic.PicID FROM Over_Pics.Pic LEFT JOIN Over_SeenPics.Seen ON Over_Pics.Pic.PicID=Over_SeenPics.Seen.PicID");

You can loop through the rows of the result set with this:

while ($row = mysqli_fetch_array($r, MYSQLI_ASSOC)){
    foreach ($row as $key => $value){
        echo $key." - ".$value.", ";
    }
    echo "\n";
}

That will output the results of the query to the screen. Of course you will most likely want to change the formatting.