The best replacement for full outer join is full join.

The best alternatives to full outer join are rated as following:
★★★★★  full join
★★★★★  cross join
★★★★  left outer join
★★★  union
★★  union all
★  cartesian product
★  outer join
★  left join

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Speaking about full outer join, one probably shouldn't forget about three tables.

Other search terms related to full outer join and their ratings are:
★★★★★ three tables
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Google Trends

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full outer join
full join
cross join