outer join 예문

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1. Right and left outer joins are functionally equivalent.
2. If you use " left outer join ", strawberry gets a count of 1 for the null row.
3. These include semi-join, outer operators such as outer join and outer union, and various forms of division.
4. I tried various ways of configuring the outer joins but couldn't find a way to do it the right way.
5. A left outer join can usually be substituted for an inner join when the join columns in one table may contain NULL values.