MySQL加入不返回所有结果

Question

SELECT * FROM products AS p JOIN images AS i ON (p.id = i.product_id)

我希望此查询还返回与“products”相关的“images”中没有字段的结果。我该怎么做？

Answer 1

您需要OUTER加入。

SELECT *
FROM   products AS p
       LEFT JOIN images AS i
         ON ( p.id = i.product_id )  

LEFT因为你想要保留左（第一）表中的所有行。

Answer 2

您需要使用LEFT JOIN：

   SELECT * FROM 
      products AS p LEFT JOIN images AS i ON p.id = i.product_id;