Get data from two mysql tables in a same php file

Question

I have a PHP page for displaying data from MySQL table 'table1'. I've added a simple visitors counter in the second PHP file, and it shows visits in another MYSQL table 'table2' in the same database.

I need to display data from 'table2' on the same PHP page where is data from 'table1'

Code for the PHP page.

<?php
$db_host = 'localhost'; // Server Name
$db_user = 'username'; // Username
$db_pass = 'password'; // Password
$db_name = 'database'; // Database Name

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
if (!$conn) {
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());  
}

$sql = 'SELECT * 
        FROM table1 INNER JOIN table2';

$query = mysqli_query($conn, $sql);

if (!$query) {
    die ('SQL Error: ' . mysqli_error($conn));
}

?>

Okay, so I did INNER JOIN to get both tables, but how to post visitors counter data from table2 in let's say h2 tag?

Answer 1

I don't really get your question right. But I think what you are doing wrong is your inner join.

Your INNER JOIN:

$sql = 'SELECT * 
    FROM table1 INNER JOIN table2';

How it should be:

$sql - 'SELECT * FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name';

Where the column names must have the same value.

Answer 2

I don't know how your tables are linked together.
JOIN is used to link a table to another on an attribute (like foreign key). You need to specify which attribute writing "SELECT * FROM table1 JOIN table2 ON table1.firstattribute = table2.secondattribute" that is equivalent to "SELECT * FROM table1, table2 WHERE table1.firstattribute = table2.secondattribute".

I think you need simply do a query on table2 filtering an attribute given from the first table1. You can do 2 queries or just one with JOIN. I'd like to have more information but here a sample

<?php
$db_host = 'localhost'; // Server Name
$db_user = 'username'; // Username
$db_pass = 'password'; // Password
$db_name = 'database'; // Database Name

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
if (!$conn) {
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());  
}

$sql = 'SELECT * 
        FROM table1 JOIN table2 ON table1.attr1 = table2.attr2';

$query = $conn->query($sql);

if (!$query) {
    die ('SQL Error: ' . mysqli_error($conn));
}

if(mysqli_num_rows($query)>0){
    //we can create an object that has the same attribute of both tables
    $object = $query->fetch_object();
    //for example $object has views of table2.views
    echo '<h2>Views:' . $object->views . '</h2>';

}


?>

So, if I understood good you only need use fetch_object and a correct form of JOIN