To illustrate how a LEFT JOIN works, let’s simply change INNER JOIN to LEFT JOIN in our original SELECT statement, like this: SELECT Donors.DonorID,Donors.Donorname. DonationRecords.DonationAmt ...

The left join updates all rows in table A. Inner join only updates rows in table A where there is a matching ID in table B. You're working with different row sets.

In this example, you will first create an inner join that relates employee identification number and salary. Then, you will create an outer join that combines this data with data from another table to ...