PHP MYSQL，两个表

Question

I have two tables and i want to echo the total call count once each user logins:

Login

Firstname | Lastname | Login ID
------------------------------
Tyler     | Durden    | 3

Call Count

Name        | Call Count | Open       | GrandTotal
------------------------------
Tyler Durden| 100        |    33      | 133

i tried:

 <?php

 $result = mysqli_query($mysqli, "SELECT * FROM csvdata WHERE Name=".$_SESSION['firstname']. ' ' .$_SESSION['lastname']." ");

while($res = mysqli_fetch_array( $result )) {

echo $res['Open'].' Open Calls';
echo $res['GrandTotal'].' Grand Total Calls';

 } 
 mysqli_close($mysqli);
?>

But its not working, i think i have to join the the two tables to get it to work. What do you think?

Answer 1

Assuming your Call Count table is actually called csvdata, you'll want to format your SQL request string a bit by adding single quotes around the WHERE name = part.

<?php

    $result = mysqli_query($mysqli, "SELECT * FROM csvdata WHERE Name='".$_SESSION['firstname']. ' ' .$_SESSION['lastname']."' ");

    while($res = mysqli_fetch_array( $result )) {

        echo $res['Call Count'].' Call Count';
        echo $res['Open'].' Open Calls';
        echo $res['GrandTotal'].' Grand Total Calls';

    } 
    mysqli_close($mysqli);
?>

Answer 2

Good practice would require that you use primary keys to facilitate joins between tables and make sure two users with the same name can be differenciated.

In that case you may want to consider replacing the Name column in your Call Count table for your loginID. This way you could get your name from the Login table (as shown below). Also, as bad as it is to have duplicated data like your user's name in both tables, you do not need your GrandTotal column since you can easily get the sum of CallCount and Open to get the exact same number. In the end, your query should look more like this (assuming your tables are called Login and CallCount).

<?php
    $result = mysqli_query($mysqli, "SELECT l.FirstName, l.LastName, cc.CallCount, cc.Open, (cc.CallCount + cc.Open) AS GrandTotal FROM Login AS l JOIN CallCount AS cc ON l.LoginID = cc.LoginID WHERE l.FirstName LIKE \"".$_SESSION['firstname']."\" AND l.LastName LIKE \"".$_SESSION['lastname']."\"");

    // ...
?>