JOIN three tables together and limit a row of thirst table - PDO - mysql

Question

I have three tables :
table1
id title name user token
1 supermarket big market user1.example#gmail.com aaaaa
2 hear styler stylist user2.example#gmail.com bbbbb
table2
id country city user token
1 USA New York user1.example#gmail.com aaaaa
2 UK London user2.example#gmail.com bbbbb
table3
id url user token
1 uploadPic/image1.jpg user1.example#gmail.com aaaaa
2 uploadPic/image2.jpg user1.example#gmail.com aaaaa
3 uploadPic/image3.jpg user2.example#gmail.com bbbbb
4 uploadPic/image4.jpg user2.example#gmail.com bbbbb
5 uploadPic/image5.jpg user2.example#gmail.com bbbbb
6 uploadPic/image6.jpg user2.example#gmail.com bbbbb
and I used INNER JOIN to merge tables together:
$response['info'] = array();
$sql = "SELECT * FROM `table1` as tb1
INNER JOIN `table2` as tb2 ON tb1.token = tb2.token
INNER JOIN table3 as tb3 ON tb3.token = tb1.token
ORDER BY tb1.id DESC";
$run = $connect->prepare($sql);
$run->execute();
$record = $run->fetchAll(PDO::FETCH_ASSOC);
$response['info'] = $recordAdvert;
echo json_encode($response,JSON_PRETTY_PRINT);
and the result is :
{
"info": [
{
"id": "6",
"title": "superMarket",
"name": "big market",
"user": "user2.example#gmail.com",
"token": "bbbbb",
"country": "UK",
"city": "London",
"url": "uploadPic/image2.jpg"
},
{
"id": "5",
"title": "superMarket",
"name": "big market",
"user": "user2.example#gmail.com",
"token": "bbbbb",
"country": "UK",
"city": "London",
"url": "uploadPic/image1.jpg"
},
{
"id": "4",
"title": "superMarket",
"name": "big market",
"user": "user2.example#gmail.com",
"token": "bbbbb",
"country": "UK",
"city": "London",
"url": "uploadPic/image6.jpg"
},
{
"id": "3",
"title": "hear styler",
"name": "stylist",
"user": "user1.example#gmail.com",
"token": "aaaaa",
"country": "USA",
"city": "NEW YORK",
"url": "uploadPic/image5.jpg"
},
{
"id": "2",
"title": "hear styler",
"name": "stylist",
"user": "user1.example#gmail.com",
"token": "aaaaa",
"country": "USA",
"city": "NEW YORK",
"url": "uploadPic/image4.jpg"
},
{
"id": "1",
"title": "hear styler",
"name": "stylist",
"user": "user1.example#gmail.com",
"token": "aaaaa",
"country": "USA",
"city": "NEW YORK",
"url": "uploadPic/image3.jpg"
}
]
}
but this is not that i want. there are must be just two rows because i have just two user and two token so i want to limit image to 1 but i can't due to when i used limit in image table to just limit image to one for both of users it limit total table.
the result must be something like this:
{
"advert": [
{
"id": "2",
"title": "hear styler",
"name": "stylist",
"user": "user2.example#gmail.com",
"token": "bbbbb",
"country": "UK",
"city": "London",
"url": "uploadPic/image3.jpg"
},
{
"id": "1",
"title": "supermarket",
"name": "big market",
"user": "user1.example#gmail.com",
"token": "aaaaa",
"country": "USA",
"city": "New york",
"url": "uploadPic/image1.jpg"
}
]
}
I edit the select query like this :
$sql = "SELECT * FROM `table1` as tb1
INNER JOIN `table2` as tb2 ON tb1.token = tb2.token
INNER JOIN (SELECT * FROM table3 LIMIT 1) as tb3 ON tb3.token = tb1.token
ORDER BY tb1.id DESC";
but it limit the total row not just table 3 row.
{
"info": [
{
"id": "6",
"title": "superMarket",
"name": "big market",
"user": "user2.example#gmail.com",
"token": "bbbbb",
"country": "UK",
"city": "London",
"url": "uploadPic/image2.jpg"
}
]
}

Answer 1

You can use a correlated subquery that use LIMIT to get just one URL per user.
SELECT t1.id,
t1.title,
t1.name,
t1.user,
t1.token,
t1.country,
t2.city,
(SELECT t3.url
FROM table3 t3
WHERE t3.token = t1.token
ORDER BY t3.id DESC
LIMIT 1) url
FROM table1 t1
INNER JOIN table2 t2
ON t2.token = t1.token
ORDER BY t1.id DESC;