May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Understanding results returned with a left outer join
A left outer join includes all rows from the left table and any matching rows between the left and right tables. The following Venn diagram shows in gray the rows that would be returned with two tables:
If there are no rows in Table B that match Table A, only rows from Table A will be returned. Rows returned from Table A that don't have any matching rows in Table B will show null values for the columns in Table B.
Additionally, you can use a left excluding join. This would include all rows from the left table that don't match records in the right table, as shown in the Venn diagram depicted ...
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