Posted on April 2, 2020 by jamie

The issue is possibly caused when Import/Export DataBase Views was not created in Magento 2.3. So create Views and inventory_stock_1 table in the Database.

CREATE ALGORITHM=UNDEFINED SQL SECURITY INVOKER VIEW `inventory_stock_1`  AS
select distinct `legacy_stock_status`.`product_id` AS `product_id`,
`legacy_stock_status`.`website_id` AS `website_id`,
`legacy_stock_status`.`stock_id` AS `stock_id`,
`legacy_stock_status`.`qty` AS `quantity`,
`legacy_stock_status`.`stock_status` AS `is_salable`,
`product`.`sku` AS `sku`
from (`cataloginventory_stock_status` `legacy_stock_status`
join `catalog_product_entity` `product`
on((`legacy_stock_status`.`product_id` = `product`.`entity_id`))) ;

Source: https://magento.stackexchange.com/questions/256997/salable-quantity-is-showing-zero-in-product-grid-magento-2