如何查询has_many关联表的参数？

Question

Category 
String id; 
String name; 
boolean enabled;

Product 
String id; 
String name; 
boolean enabled; 
int categoryId;

I need to search for all of the enabled categories that actually have products and those products should have enabled set to true .

I am not really that adept at SQL queries so could someone please point me to the right direction?

Answer 1

Here it is:

SELECT Category.* FROM Category   
INNER JOIN Product ON Category.id=Product.categoryId  
 WHERE  Category.enabled = 1 AND Product.enabled=1
 GROUP BY Category.id   

I am not sure about the boolean values representation in your DB, assuming it is 1/0