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. Now if you said something like: ...

QL Joins are a crucial part of database management, helping you retrieve related data from different tables in a structured way. Allows you to combine data from multiple tables based on related ...

In this example, the LEFT JOIN answers the following business question: ... most implementations of SQL support the INNER JOIN, LEFT JOIN, and RIGHT JOIN constructs.

In this SQL Server tip, Arthur Fuller explains the effects of NULLs, and the different results obtained by inner and outer JOINs.