Written by Frank Kenedy. / Last updated on 07 August 2018.

How to fix SQL error to Install Prestashop

When you install Prestashop on a server with Mysql 5.7, you will get an error occured installation process :

"SQL error on query All parts of a PRIMARY KEY must be NOT NULL, if you need NULL in a key, use UNIQUE instead"

This error will breaks your installation process whether you try to reinstall as many times. Here is the way to fix this problem.

Open your Prestashop-package/install/data/db_structure.sql file :

Find

CREATE TABLE `PREFIX_cart_product`

Look below this line and change PRIMARY KEY to UNIQUE

Save and exit. That's all. Now you can re-install without any problems.

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Latest modules update!

iConvert Promotions 8.0.0 ⊙

Optimize source codes to improve the performance and user experiences on PrestaShop 8, resolved various issues to enhance compatibility with PrestaShop 1.7.x.

DocumenThemix 3.3.7 ⊙

Compatible with PrestaShop 8.

ChargeMe v5.4.1 ⊙

Clear the cart & redirect to the checkout page.

Age Restriction - 18+ v2.3.6⊙

Fix page assignment issues.

Newsletter Popup v3.2.5 ⊙

Enhance the level of security.

JumptoCheckout v.2.1.1 ⊙

Fix the deleting product issue.

What is new in PrestaShop 8 beta?