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Chapter 14. Outer Joins

An inner join may drop some of the rows from the beginning tables. An outer join puts back some of those rows. There are three types of outer joins, each type adding back a different set of the dropped rows.

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Introduction to Outer Joins		519
14-1	Outer joins are derived from inner joins	519
14-2	The three types of outer joins	520
14-3	The left outer join	522
14-4	The right outer join	524
14-5	The full outer join	526
14-6	An introduction to the `union`	529
14-7	An example of a `union` of two tables with matching columns	531
Applications of Outer Joins		534
14-8	Counting to zero, part 4	534
14-9	Combining an outer join with a selection of the data	536
14-10	A full outer join in sorted order	539
14-11	Finding the defects in a pattern	542
14-12	Comparing tables using two ...