Please explain MySQL Joins in simple language

Question

Please explain to me joins in simple language. Please do not post a web link as I need to read how a developer understand it, not an author.

Answer 1

Best I can point you to is A Visual Explanation of SQL Joins.

The diagrams helped me a lot.

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Adding the main diagrams from the linked post here.

Inner Join

Inner join produces only the set of records that match in both Table A and Table B.

Full outer join

Full outer join produces the set of all records in Table A and Table B, with matching records from both sides where available. If there is no match, the missing side will contain null.

Left outer join

Left outer join produces a complete set of records from Table A, with the matching records (where available) in Table B. If there is no match, the right side will contain null.