I'm doing a package tracking feature for the website of a delivery service out here. I'm trying to perform an inner join based on the success of an if statement in my sql query.

insert into Customer (CustomerID, CustomerName, Email) values (1, 'Alice Smith', 'alice.smith@example.com'), (2, 'Bob Johnson', 'bob.johnson@example.com'), (3 ...

I've been in an argument with one of our devs that took an update statement with an inner join and made it a left join (because inner was missing some records somehow in the left table - tableB in ...