php - Day by day summing of values from a table -


i have script gathers data , table structure

 date - y-m-d h:i:s  name - example  quantity - 1  example  id - date - name - quantity  1 - 2015-05-13 16:33:09 - test1 - 1  2 - 2015-05-13 19:10:45 - test2 - 3  3 - 2015-05-13 22:01:39 - test3 - 1  4 - 2015-05-14 07:13:20 - test4 - 1  5 - 2015-05-14 09:29:37 - test5 - 2

how can add quantity on same date 2015-05-13 day day output data in text format: 5, 3 ......

require_once 'config.php';  $mysqli = new mysqli($server, $db_user, $db_password, $database);  if ($mysqli->connect_error) {     die("connection failed: " . $conn->connect_error); }  $sql = "select id, date, quantity downloads"; $result = $mysqli->query($sql);  if ($result->num_rows > 0) {     while($row = $result->fetch_assoc()) {         echo $row["quantity"]. "<br>";     } } else {     echo "0 results"; } $mysqli->close();

use query sum of quantities per date

select date(`date`), sum(quantity) downloads group date(`date`)

it group results date part of datetime column date , provide sum of quality column every date.

date function explanation: https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date

sum function explanation: https://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_sum


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