PHP：MY​​SQLI-从同一行获取数据

Question

I have taken to this data that are the same but presented only one here

now I want to get text from last row

$sql_query = $connection->query("SELECT DISTINCT `sent_by`, `sent_to` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1'"); 
if($sql_query->num_rows > 0) {
    while ($fetch_data = $sql_query->fetch_array(MYSQLI_ASSOC)) {
        if($fetch_data["sent_by"] == 1) {
            echo $fetch_data["sent_to"]. " TEXT: ". $fetch_data["text"].  </br>";
        } else {
            echo $fetch_data["sent_by"]. " TEXT: ". $fetch_data["text"].  </br>";
        }
    }
}

Database structure:

Sorry for my bad english

Answer 1

UPDATED

If you have field id as auto increment field, then you can get the last row with this SQL query:

SELECT DISTINCT `sent_by`, `sent_to`, `id`, `text` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1' ORDER BY `id` DESC LIMIT 1

So change this:

$sql_query = $connection->query("SELECT DISTINCT `sent_by`, `sent_to` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1'"); 

on this:

$sql_query = $connection->query("SELECT DISTINCT `sent_by`, `sent_to`, `id`, `text` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1' ORDER BY `id` DESC LIMIT 1"); 

In this new query you sort all results by the value of id field in descending order.

If you will remove DISTINCT from your query, you can remove also id from SELECT list in your query.

Answer 2

删除DISTINCT，并仅创建查询

$sql_query = $connection->query("SELECT sent_by, sent_to FROM chat WHERE sent_by = '1' OR `sent_to` = '1'");