如何将2列合并为1列以在SQL中输出TO]] << [

Question

我有这个SQL查询：

$sql = "SELECT d.doctor_name, a.patient_name, s.date, s.time FROM appointments AS a LEFT JOIN doctors AS d ON d.id = a.doctor_id LEFT JOIN slots AS s ON  s.id = a.slot_id WHERE s.date > '2019-10-01' ORDER BY d.doctor_name DESC ";

$result = $mysqli->query($sql);

echo '<pre>';
while ( $row = $result->fetch_assoc() ) {
    print_r($row);
}
echo '</pre>';

它的输出是：

Array
(
    [doctor_name] => Khaled
    [patient_name] => Nawaz
    [date] => 2019-10-11
    [time] => 02:01
)
Array
(
    [doctor_name] => Khaled
    [patient_name] => Anik
    [date] => 2019-10-07
    [time] => 02:31
)
Array
(
    [doctor_name] => Khaled
    [patient_name] => Manik
    [date] => 2019-10-02
    [time] => 03:31
)

我可以将date和time列合并为
slot_date_time

吗？因此输出将是例如：

Array
(
    [doctor_name] => Khaled
    [patient_name] => Manik
    [slot_date_time] => 2019-10-02 03:31
)

我有此sql查询：$ sql =“ SELECT d.doctor_name，a。Patient_name，s.date，s.time FROM约会，作为左联接医生AS d ON d.id = a.doctor_id，LEFT JOIN插槽AS s ON s.id = a.slot_id ...

Answer 1

尝试此查询