How to link and display MySQL data from two different tables? - php

Question

I have two tables named "stats" and "users"
users table has all the typical user data like id,username,password,email(columns)
stats table has id,attack, defense,ostats,gold,food(columns)
I want to display data from these two tables side by side and have the data linked through their IDS
For example,
Rank user_uid ostats attack defense gold
1 Test 10 5 5 100
2 Test2 8 2 6 60
3 Test3 6 5 1 40
Username is from table "users" and the rest of them are from table "stats"
So first I want to know how to link and display the data from the same ID, like Username(user_id=1) and ostats,attack,defense,gold,food(id=1)
Then I want them in order by their "ostats" (I don't have a column named "rank" in any table yet, just don't know how to create the rank using overall stats)

Answer 1

You could do something like (untested)
SELECT u.username, s.overall, s.attack, s.defense, s.gold
FROM stats s JOIN users u on s.user_uid = u.id
ORDER BY s.overall;
Possible solution to ranking:
set #row_number=0;
SELECT (#row_number:=#row_number+1) as rank, u.username, s.overall, s.attack, s.defense, s.gold
FROM stats s JOIN users u on s.user_uid = u.id
ORDER BY s.overall;
Another, horrible looking attempt:
set #row_number = (select count(*) from users) + 1;
select (#row_number:=#row_number-1) as rank, u.username, s.overall from
stats s join users u on s.user_uid = u.id order by s.overall desc;
set #row_number = 0;
Here in PHP code, you have to run it as two queries to set the variable, then run the actual ranking query. This way, the rank variable is always set to 0 when running this. Note that I've used different table and column names, just to simplify things a little. Remember to adjust to your specific needs.
// connect to database
$conn = mysqli_connect("localhost", "user", "password", "database");
// this query will set a variable to 0.
$setSql = "SET #row_number = 0;";
// run the query. This will return a boolean - true or false, depending on whether or not the query ran successfully
$variableSet = mysqli_query($conn, $setSql);
// if the query ran successfully
if($variableSet){
// setup the actual ranking query
$statsSql = "select
(#row_number:=#row_number+1) as rank,
u.id,
u.username,
s.overall
from
mstats s
join
musers u
on
s.muser = u.id
order by
s.overall desc;";
$ranks = mysqli_query($conn, $statsSql);
if(!$ranks){
// dump error from rank query
var_dump($conn->error);
} else {
// dump results as associative array
var_dump($ranks->fetch_all(MYSQLI_ASSOC));
}
} else {
// dump errors from setting variable
var_dump($conn->error);
}
For me, the results dump looks like this:
array (size=3)
0 =>
array (size=4)
'rank' => string '1' (length=1)
'id' => string '2' (length=1)
'username' => string 'Bar' (length=3)
'overall' => string '1000' (length=4)
1 =>
array (size=4)
'rank' => string '2' (length=1)
'id' => string '6' (length=1)
'username' => string 'Tom' (length=3)
'overall' => string '7' (length=1)
2 =>
array (size=4)
'rank' => string '3' (length=1)
'id' => string '1' (length=1)
'username' => string 'Foo' (length=3)
'overall' => string '3' (length=1)