Price and default attribute

[stuners]

Hello,

 

my shop use Prestashop 1.6.1.1. Shop is connected with and ERP / CRM.

 

We have seen that a lot of products display a price of 0€ on product-list but works on single product.  

 

When i check on my back-office, i have seen that these products didn't have default attribute ...

If i "checked" default, it works.

 

- I dont want to change this one bye one, i would like to know, why this has been done ?

- Can i turn on default attribute for my 650 products in SQL ?

 

 

Thanks,

 

Regards