[英]PHP: MYSQLI - Get data from same row
我已經接受了相同的數據,但這里僅介紹了一個
現在我想從最后一行獲取text
$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>";
}
}
}
數據庫結構:
對不起,我的英語不好
更新
如果您將字段id
作為自動增量字段,則可以使用此SQL查詢獲取最后一行:
SELECT DISTINCT `sent_by`, `sent_to`, `id`, `text` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1' ORDER BY `id` DESC LIMIT 1
所以改變這個:
$sql_query = $connection->query("SELECT DISTINCT `sent_by`, `sent_to` FROM `chat` WHERE `sent_by` = '1' OR `sent_to` = '1'");
在此:
$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");
在此新查詢中,您將按id
字段的值對所有結果進行降序排序。
如果要從查詢中刪除DISTINCT
,也可以從查詢的SELECT列表中刪除id
。
刪除DISTINCT,並僅創建查詢
$sql_query = $connection->query("SELECT sent_by, sent_to FROM chat WHERE sent_by = '1' OR `sent_to` = '1'");
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.