我如何限制取自mysql的值？

Question

I have a table which has values i want to retrieved in json format and put in android. My question is how do i limit 1 value to only 1?

Here is my code

$sql = "SELECT * from news  Order by n_date Desc";
 $con = mysqli_connect($server_name,$mysql_user,$mysql_pass,$db_name); 


 $result = mysqli_query($con,$sql);


 $response = array();
while($row=mysqli_fetch_array($result))
{
array_push($response, array("NID"=>$row['NID'], "title"=>$row[2], "content"=>$row[3], "n_date"=>(new DateTime($row[4]))->format('M d, Y l g:i:s A')));
 }



echo json_encode (array("news_response"=>$response));




mysqli_close($con);

?>

Example is for n_date i only want to display the date 1 time. But it keeps on looping. How do i limit the date to only 1 where everything else loops?

Example is like this

      {"news_response":[{"NID":"2","title":"2016","
    content":"Hello World ",
    "n_date":"Feb 17, 2017 Friday 11:01:57 PM"},{"NID":"1","title":"Hello there",
"content":"Hello there hehe"}]}

Answer 1

If you want to limit the data, you can change your SQL query by adding a LIMIT:

$sql = "SELECT * FROM news ORDER BY n_date DESC LIMIT 1";

If you need more information, you can look into the MySQL Reference Manual:

The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement.

Source: https://dev.mysql.com/doc/refman/5.5/en/select.html