count all posts in table "posts" regarding users from table "users" - php

Question

two tables - posts and users
column posts.user is matching with users.id.
I want to count all posts from all users, this way:
user1 5
user2 3
user3 9
... and so on meaning that user1 from users has 5 instances from posts... etc.
$items = '';
$sql = "select users.name, posts.user from users inner join posts on users.id = posts.user";
$stmt = $db->query($sql);
while($row = $stmt->fetch()){
$count = $stmt->rowCount();
$items .= "<div><span class='spanuser'>" . $row['name'] . "</span> <span class='spancount'>" . $count . "</span></div>";
}
echo $items;
result
user1 74 // 74 is total number of `posts` rows
user2 74
user3 74
... all users - 74
Any help?

Answer 1

You need to use GROUP BY with LEFT JOIN, e.g.:
SELECT u.name, COUNT(p.id) AS `count`
FROM users u LEFT JOIN posts p ON u.id = p.user
GROUP BY u.name;
This will give you the desired output.
Update
As per our discussion, to get the count for today, you can use the following query:
SELECT u.name, COUNT(p.id) AS `count`
FROM users u LEFT JOIN posts p ON u.id = p.user
WHERE DATE(datetime) = DATE(NOW())
GROUP BY u.name;
Similarly, you can use BETWEEN operator to get the same count for a date range, e.g., for last 7 days, you can use this:
SELECT u.name, COUNT(p.id) AS `count`
FROM users u LEFT JOIN posts p ON u.id = p.user
WHERE DATE(datetime) BETWEEN DATE_ADD(NOW(), INTERVAL -7 DAY) AND DATE(NOW())
GROUP BY u.name;
Also, you need to update the php to use the count returned by the query and not rowCount, e.g.:
$items .= "<div><span class='spanuser'>" . $row['name'] . "</span> <span class='spancount'>" . $row['count'] . "</span></div>";

Answer 2

Try doing it this way using Count()
$items = '';
$sql = "SELECT u.name,COUNT(p.user) as pCount FROM users u INNER JOIN posts p on u.id = p.user GROUP BY u.name";
$stmt = $db->query($sql);
while($row = $stmt->fetch()){
$items .= "<div><span class='spanuser'>" . $row['name'] . "</span> <span class='spancount'>" . $row['pCount'] . "</span></div>";
}
echo $items;

Answer 3

Try use COUNT(). To count the posts.user
https://www.w3schools.com/sql/sql_count_avg_sum.asp

Answer 4

You want to group by the user and count the number of posts, to get the final total row you want a WITH ROLLUP e.g.
SELECT COALESCE(User,'TOTAL') AS Name,
Count(Post.ID) AS CountOfPosts
FROM Users
LEFT JOIN Posts ON Posts.USer= Users.id
GROUP BY Users.id WITH ROLLUP
The "total" row will actually have a value of null so we use the COALESCE to change null into TOTAL