Question

我有一个SQL查询，它连接三个不同表中的列并且工作正常。如果Room_ID在我已经拥有的数组中，我只希望运行此查询。这两个查询分别工作正常，但我不能让它们一起工作。如果满足这个条件，这就是我想要运行的：

SELECT message.Message, message.Period, message.Date, teacher.Firstname, teacher.Lastname, rooms.Room_ID, rooms.Description
FROM message JOIN
teacher
ON teacher.Teacher_ID = message.Teacher_ID JOIN
rooms
ON message.Room_ID = rooms.Room_ID

这就是条件：

WHERE message.Room_ID IN myArray

我尝试了括号并将WHERE条款放在不同的地方，但无济于事。

Answer 1

你可以试试这个：

说，$ array是你的数组。

$sql = "SELECT message.Message, message.Period, message.Date, teacher.Firstname, teacher.Lastname, rooms.Room_ID, rooms.Description
FROM message LEFT JOIN teacher ON teacher.Teacher_ID = message.Teacher_ID LEFT JOIN rooms ON message.Room_ID = rooms.Room_ID WHERE message.Room_ID IN ".$array;

希望这有帮助。

和平！的xD

Answer 2

$sql = "
    SELECT message.Message, message.Period, message.Date, teacher.Firstname, teacher.Lastname, rooms.Room_ID, rooms.Description
    FROM message 
    LEFT JOIN teacher ON teacher.Teacher_ID = message.Teacher_ID 
    LEFT JOIN rooms ON message.Room_ID = rooms.Room_ID 
    WHERE message.Room_ID IN (".implode(",", $myArray).")";

带有JOIN的MySQL WHERE子句

2 个答案: