For the sake of learning, How could I update a products quantity via the SQL Database

Running the latest versions of everything.

I know there are plugins like EasyPopulate, but as I said in the title this is for the sake of learning. If I have a products public ID, and wanted to find its ID, and update its Quantity manually in PHPMyadmin, what database would I go to? I see many for products, but cannot figure out where quantity is kept or how the product ID's work. For example, in the product database, a given product will have an ID of 1, and a public ID of whatever I set it to. When I search the public ID in the back end of my site, the product ID it shows me is completely different. Just trying to wrap my head around this.

Zen Cart has a table called products that has a primary key of id.
So if you wanted to select product 1, you'd use

SELECT * FROM products WHERE products_id = 1

The database that your Zen Cart installation uses is shown on the Version screen in your admin.
See (d) in the large image on this page:
https://docs.zen-cart.com/user/admin_pages/tools/server_info/

It is not ideal to do things using phpMyAdmin though - you want to learn the Zen Cart admin. You can set a product's quantity on the product edit page:

https://docs.zen-cart.com/user/products/product_edit/

Does that make sense?

Public ID whatever you set it to? I'm assuming you're mixing the term ID with model number. You can set the model number, but you can not set the product's ID - that's a unique identifier that is automatically assigned by the database with the auto_increment. The ID is completely out of your control.
If you look at your URL on the product_info page, you'll see ...index.php?main_page=product_info&products_id=1234 - the 1234 is the actual ID. You can NOT search for a product by it's ID in the backend. You can see the product's ID (first column in admin where your products are listed), but you can not search for the ID.
If the "public ID" is really products_model, then your search might be giving you different results because you're using the same model number for multiple products.

If you look at the database, you'll see the products_id in multiple tables. Quantity is kept in the products table (zen_products, zc_products or whatever prefix you may have) - field name is products_quantity.

balihr:

Public ID whatever you set it to? I'm assuming you're mixing the term ID with model number. You can set the model number, but you can not set the product's ID - that's a unique identifier that is automatically assigned by the database with the auto_increment. The ID is completely out of your control.
If you look at your URL on the product_info page, you'll see ...index.php?main_page=product_info&products_id=1234 - the 1234 is the actual ID. You can NOT search for a product by it's ID in the backend. You can see the product's ID (first column in admin where your products are listed), but you can not search for the ID.
If the "public ID" is really products_model, then your search might be giving you different results because you're using the same model number for multiple products.

If you look at the database, you'll see the products_id in multiple tables. Quantity is kept in the products table (zen_products, zc_products or whatever prefix you may have) - field name is products_quantity.

Ummm, products_id is part of the category product page search, so yes one can search in the admin using the products_id value.

@spanky not sure if your question has been answered - let us know if not.

If you want to learn more about the database schema for Zen Cart, see the file zc_install/sql/install/mysql_zencart.sql in a fresh download.

You can also view the schema here:
https://docs.zen-cart.com/dev/schema/schema_158/

mc12345678:

Ummm, products_id is part of the category product page search, so yes one can search in the admin using the products_id value.

:blink: :lamo:
Live and learn... Yes, I stand corrected, you CAN search for the products_id (note to self: take 5 secs to test before replying). Thanks, mc!

Pobody's Nerfect! :cool:

balihr:

:blink: :lamo:
Live and learn... Yes, I stand corrected, you CAN search for the products_id (note to self: take 5 secs to test before replying). Thanks, mc!

dbltoe:

Pobody's Nerfect! :cool:

Certainly made me look considering the changes made in 1.5.8. I personally went to the code to see what was expected. Glad you went the other route to confirm. :)