如何从表中获取数据，该数据在cakePHP的联接表中不可用

Question

I am using cakePhp 3.6, I have two table. Both are joined. In one table I have some token table name is codes and on another table I have stored some code for some venue. Table name is venues_codes .
Like I have 10 code in codes table. And in venues_codes table 5 code is stored for some vanue. This is the structure for venues_codes table. id venue_id code_id . Here venue_id is coming from another table. It is not my concern now. I just want to get the rest five code from codes table that is not available in venues_codes table.

This is how I have tried, but it is only fetching token that is available in both table.

$this->loadModel('VenueCodes');
$this->loadModel('Codes');
$query = $this->VenueCodes->find()
->contain(['Codes'])
->select(['id','code_id']);`

I am working with CakePHP. But if anyone can help me with the normal sql logic, that also will be helpful for me.

Answer 1

这应该为您提供所有未连接到场所的代码：

$codes = $this->Codes->find()->notMatching('Venues');

Answer 2

纯mysql查询如下所示：

 SELECT code FROM codes WHERE code NOT IN (SELECT code_id FROM venues_codes);