In an outer join operation,the join condition is equality,one of the join columns is discarded in the result table,and the join columns have the same unqualified name.

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In an outer join operation, the join condition can be equality, but none of the join columns are discarded in the result table, and having the same unqualified name for join columns does not lead to their exclusion.

In an Outer Join Operation,the Join Condition Is Equality,one of the Join