MySQL AND 语句失败

Question

我的查询失败了，这似乎是 AND 语句失败了。

if(isset($_POST['sea']) && $_POST['sm'] !==''){
$sm = trim($_POST['sm']);
$sql = "SELECT * FROM `memorials` WHERE `fname` LIKE '$sm%' OR `lname` LIKE '$sm%' OR    `comments` LIKE '$sm%' AND `status` = '2' ";
$q = $conn->prepare($sql);
$q->execute();

我添加\删除了反引号，'status = '2' 失败。

以下语句在 phpmyadmin 中有效

SELECT * FROM `memorials` WHERE `fname` LIKE 'test%' AND status = '2'

此语句在 phpmyadmin 中失败

SELECT * FROM `memorials` WHERE `fname` LIKE 'test%' OR `lname` LIKE 'test%' AND status = '2'

此查询搜索注释 AND 子句有效，但忽略 fname 和 lname

$sql = "SELECT * FROM memorials WHERE `fname`  OR  `lname`  OR `comments`  LIKE '$sm%'  AND status = '2'    ";

有人对我失败的地方有建议吗

谢谢

加里

Answer 1

您需要在适当的部分两边加上括号。也许是这样的:

SELECT * 
FROM `memorials` 
WHERE (`fname` LIKE 'test%' OR `lname` LIKE 'test%') AND status = '2'