MySQL FIND_IN_SET（）无法与JOIN一起使用

Question

I have this table:

... | products | ...
... | 1, 5, 5  | ...
... | 3, 1, 6  | ...

And this query:

SELECT
  orders.id, 
  orders.user_id, 
  users.username, 
  orders.products, 
  orders.rating, 
  orders.payment, 
  orders.comment 
FROM 
  orders JOIN users 
  ON orders.user_id = users.id 
WHERE 
  FIND_IN_SET(1, REPLACE(orders.products, ' ', '')) > 0;

I need to get these rows but it gives me no result, I've tried the query using only the table orders , and it works. So why it does not work with JOIN ?

Answer 1

Try this query:

SELECT
  orders.id, 
  orders.user_id, 
  users.username, 
  orders.products, 
  orders.rating, 
  orders.payment, 
  orders.comment 
FROM 
  orders JOIN users 
  ON orders.id = users.id 
WHERE 
  FIND_IN_SET(1, REPLACE(orders.products, ' ', '')) > 0;

I have changed user_id to id in the line that joins the two tables.