There are following set of Database Tables Store Sales Invoice Order Data
[1] sales_Invoice :: Store [Sold Product base total, shipping total, Tax Total,Grand Total] etc.
[2] sales_Invoice_item :: Store [Sold Product Details[sku, name ect], price etc.]
[3] sales_Invoice_grid :: Store [Sold product Billing/Shipping Address Grand Item Price, Order ID(order_id), Customer Email]
[4] sales_Invoice_comment :: [Display Invoice comment & also notified , either customer notified or not]
[5] sales_Invocie_aggregated :: Store [sales Invoice aggregated data]
[6] sales_Invocie_aggregated_order :: Store [sales Invoice aggregated ordered data ]
Magento 2 All Database Tables [500 and more Tables]
Which Magento 2 Database Tables Store Sales Order Data
Which Magento 2 Database Tables Store Sales Invoice Order Data
Which Magento 2 Database Tables Store Sales Tax and Its related Data
Which Magento 2 Database Tables Store Catalog Price Rules
Which Magento 2 Database Tables Store Cart Price Rules
Which Magento 2 Database Table Store Patches
Which Magento 2 Database Tables Store Customer Review