Concat兩個字段放入下拉菜單

Question

我試圖簡單地從表格中顯示兩個字段，例如名字，姓氏，將它們組合並顯示在可以選擇的下拉菜單中，並與用戶輸入的其他數據一起存儲。下面，爲一個領域工作，但我努力結合姓氏，我曾嘗試concat，但我認爲我做錯了。提前致謝。

//Drop Down Select 
    $sql = "SELECT concat (firstname, lastname) as username FROM users_tbl"; 
$result = pg_query($sql); 
echo "<select name='firstname'>"; 

while ($row = pg_fetch_array($result)) { 
echo "<option value='" . $row['firstname'] . "'>" . $row['firstname'] ."</option>"; 

} 
echo "</select>"; 
// close connection 

Answer 1

試試這個方法： -

$sql = "SELECT concat (firstname, lastname) as username FROM users_tbl"; 
$result = pg_query($sql); 
echo "<select name='firstname'>"; 

while ($row = pg_fetch_array($result)) { 
echo '<option value="'.$row['username'].'" >'.$row['username'].'</option>'; 
} 
echo "</select>"; 
// close connection 

Answer 2

要麼依靠SQL ...

while ($row = pg_fetch_array($result)) { 
    echo "<option value='" . $row['username'] . "'</option>"; 
} 

或者不使用SQL CONCAT並用PHP做到這一點：

while ($row = pg_fetch_array($result)) { 
    echo "<option value='" . $row['firstname'] . " " . $row['lastname'] ."'</option>"; 
} 

但不要兩者都做。