how to call 2 tables from mysql database with php [duplicate] - php

Question

This question already has answers here:
sorting by high-low price with mysql data
(2 answers)
Closed 7 years ago.
i have 2 tables
page and orders.
$ww = mysqli_query($database->connection,"SELECT * FROM `page`
WHERE `owner` = '$session->u_id'");
while($o = mysqli_fetch_array($ww))
{
$owner = $o['id'];
$result = mysqli_query($database->connection,"SELECT * FROM `orders`
WHERE `owner` = '$owner' ORDER BY id DESC");
while($row = mysqli_fetch_array($result))
{
echo "taxi =".$o['naam']."<br>";
echo $row['id']."<br>";
}
}
the output is
23
21
20
17
26
25
24
22
19
Question is How can i sort high to low like
26
25
24
23
22
21
....

Answer 1

You need to run just one query when selecting from orders, not one query per page (BTW, it helps if you tabulate properly, people can see this then). Even better is to just run one query using a join.
You'll need to post your table structure before we can write any query.

Answer 2

1) you can use inner join to write the query if id column of second table won't be null otherwise use left join
SELECT * FROM `orders` inner join page on orders.id = page.id where owner = $session->u_id;
2) you can use your first query as sub query and put it in second one like this
SELECT * FROM `orders` WHERE exists (SELECT page.id FROM `page` WHERE `owner` = '$session->u_id' and orders.id=page` WHERE `owner` = '$session->u_id' and orders.id= )ORDER BY id DESC.id ) ORDER BY orders.id DESC
Note : if any syntax error is found the forgive me :)-