[英]MySQL WHERE clause with JOIN
我有一个SQL查询,该查询连接了三个不同表中的列,并且工作正常。 我只希望如果Room_ID在我拥有的数组中运行此查询。 这两个查询可以分别正常工作,但是我无法让它们一起工作。 如果满足此条件,这就是我要运行的内容:
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
这是条件:
WHERE message.Room_ID IN myArray
我试过括号并将WHERE
子句放在不同的位置,但无济于事。
您可以尝试以下方法:
假设$ array是您的数组。
$sql = "SELECT message.Message, message.Period, message.Date, teacher.Firstname, teacher.Lastname, rooms.Room_ID, rooms.Description
FROM message LEFT JOIN teacher ON teacher.Teacher_ID = message.Teacher_ID LEFT JOIN rooms ON message.Room_ID = rooms.Room_ID WHERE message.Room_ID IN ".$array;
希望这可以帮助。
和平! xD
$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).")";
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