Learning and practicing SQL commands. Contribute to serenayuzn/SQL_Examples development by creating an account on GitHub.

An inner join returns only the rows that match the condition in both tables. It is the most common and default type of join in SQL. For example, if you have a table of customers and a table of ...

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.

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 ...

Here is the SQL to compare the inner and outer JOINs: SELECT InnerOuter.T1.T1ID, InnerOuter.T1.NameAS Name1, InnerOuter.T2.T2ID, InnerOuter.T2.NameAS Name2 ...