SUM points from table

Question

I have table with files and their have their points/score. Iam trying to summarize those points and print it. I have a where clause for id files, but if I select random files it has same score as others like where clause isnt working.

$id is correct for each file.

This is my query:

$result = mysql_query("SELECT *,SUM(body) FROM soubory, users, hodnoti WHERE
soubory.id='".$id."' AND soubory.users_id = users.id");

hodnoti table

users_ID  soubory_id  body
  14        44         7 
  15        44         9

And now, if there is no record (in table hodnoti) for soubory_id = 45 the result is same as for 44 despite of where clause.

users table

id   nick
14   user1
15   user2

soubory table

id   nazev  users_id
44   file1  14
45   file2  14

That query should help me print this:

Who uploaded, nazev(title) of the file and then points. But if file2 has no record in table hodnoti, still has score of file1. Hope it helps.

Answer 1

$sql = "SELECT *, SUM(hodnoti.body) as sum FROM soubory 
    INNER JOIN users ON soubory.users_id = users.id
    INNER JOIN hodnoti ON soubory.id = hodnoti.soubory_id
    WHERE soubory.id='".$id."' ";

$result = mysql_query($sql);

This query works for me. When i set id=44 and get a result and when set id=45 and get all null value. i have attached two result image. I have just create table and insert your given data and run query on phpmyadmin sql tab query box. You can try this for check your query works or not.

Answer 2

Use JOIN .

$sql = "SELECT *, SUM(hodnoti.body) as sum FROM soubory 
        INNER JOIN users ON soubory.users_id = users.id
        INNER JOIN hodnoti ON soubory.id = hodnoti.soubory_id
        WHERE soubory.id='".$id."' ";

$result = mysql_query($sql);

SUGGESTION: Above is a direct answer for your question. Avoid using mysql_* statements as they are deprecated now. Learn mysqli_* or PDO and start implementing that.