MySQL从多表中获取信息

Question

I'm trying to access information from 2 different tables and its retrieving the information but it all so pulling in user information multiple times pending how many fruits listed in table tbl_fruits.

like to be able to display user information once and pull what ever number of fruits associated with the user at the same time.

2 tables: tbl_users: userid firstname lastname

tbl_fruits: userid fruit

in the example code userID 4 has 3 fruits associated with him in tbl_fruit. As you can see from the results below the user information is listed multiple times. How can I rewrite the code so that the user information is pulled once and the fruits show up 3 times.

$clientID = "4";

try 
{    $stmt = $dbcon1 ->query("SELECT 
                tbl_fruits.fruit,
                tbl_users.userid,
                tbl_users.firstname,
                tbl_users.lastname
               FROM tbl_users
                 LEFT JOIN tbl_fruits 
               ON tbl_fruits.userid = tbl_users.userid     
                    WHERE  tbl_users.userid = '$clientID' ");                

    $testArray = $stmt->fetchAll(PDO::FETCH_ASSOC);            
} 
catch(PDOException $e) 
{    echo $e->getMessage(); }

echo '<pre>';
print_r($testArray);
echo '</pre>'; 

results

array
(
    [0] => Array
        (
            [fruit] => Apple
            [userid] => 4
            [firstname] => John
            [lastname] => Smith
        )

    [1] => Array
        (
            [fruit] => Orange
            [userid] => 4
            [firstname] => John
            [lastname] => Smith
        )

    [2] => Array
        (
            [fruit] => Banana
            [userid] => 4
            [firstname] => John
            [lastname] => Smith
        )

)

Answer 1

Change your query as below:

{    $stmt = $dbcon1 ->query("SELECT 
                count(tbl_fruits.userid) 
                tbl_users.userid,
                tbl_users.firstname,
                tbl_users.lastname
               FROM tbl_users
                 LEFT JOIN tbl_fruits 
               ON tbl_fruits.userid = tbl_users.userid     
                    WHERE  tbl_users.userid = '$clientID' 
                    GROUP BY tbl_users.userid "); 

The count(tbl_fruits.userid) part counts the number of unique rows with that row's value of tbl_fruits.userid , while the GROUP BY tbl_users.userid part eliminates the duplicates.

Be sure to put an index on tbl_users.userid and tbl_fruits.userid for best performance.