使用sql：syntax error删除contactlist中的follow-relation？

Question

我正在尝试删除数据库中的跟随关系。我想用一个查询执行一个代码，删除我所遵循的代码，也反过来。我有以下代码有语法错误：

//profileId is the current user and contactsProfileId which user he/she follows
$sql = "
DELETE FROM contactlists
WHERE (profileId = '$profileId AND contactsProfileId = '$contactsProfileId')
OR (profileId = '$contactsProfileId' AND contactsProfileId = '$profileId')
";

Answer 1

您忘记为$profileId添加结束'单引号。

试试这个

$sql = "
DELETE FROM contactlists
WHERE (profileId = '$profileId' AND contactsProfileId = '$contactsProfileId')
OR (profileId = '$contactsProfileId' AND contactsProfileId = '$profileId')
";

Answer 2

首先查看$profileId：

//profileId is the current user and contactsProfileId which user he/she follows
$sql = "
DELETE FROM contactlists
WHERE (profileId = '$profileId' AND contactsProfileId = '$contactsProfileId')
OR (profileId = '$contactsProfileId' AND contactsProfileId = '$profileId')
"