如何在MySQL表中连续获取四个字段？

Question

How do I get four fields as a row in a MySQL table?

Table structure:

id     name
------------
1     John
2     Doe
3     M
4     King
5     Mark
6     Someone
7     Thing
8     Super

The html output should be:

John - Doe - M - King
Mark - Someone - Thing - Super

etc..

I have no code samples as I have no clue where to begin. I have over 300,000 rows.

Answer 1

One approach to achieve what you want would be to consider each group of 4 consecutive id values as a group, and then do a group concatenation over each set of records:

SELECT GROUP_CONCAT(`name` SEPARATOR ' - ')
FROM yourTable
GROUP BY (id - 1) DIV 4

Answer 2

you can try use remainder of the division % for get remainder number 4. for example

  for($i=0;$i<count($row);$i++) {
      echo $row['name'] ;
      if($i%4==0) {
         echo '<br/>';
      } else {
         echo ' - ';
      }
   }

Answer 3

This is what I would do:

$mysqli = database::connect(); // Get a connection
if ($result = $mysqli->query("SELECT name FROM tablename ORDER BY id ASC")) {
    $i = 0;
    $data = "";
    while($row = $result->fetch_array(MYSQLI_ASSOC)) {
        $data .= $row['name'];
        $i++;
        if ($i < 4) {
            $data .= " - ";
         } else {
            $data .= "<br />";
            $i = 0;
         }
    }
    $result->close();
}
echo $data;