Which of the join operations do not preserve non matched tuples?
Question
Which of the join operations do not preserve non matched tuples?
Solution
In SQL, the join operations that do not preserve non-matched tuples are Inner Join and Cross Join.
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Inner Join: This operation returns records that have matching values in both tables involved in the join. If a record in one table does not have a corresponding record in the other table, it is not included in the result set.
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Cross Join: This operation returns the Cartesian product of rows from the tables involved in the join. If a record in one table does not have a corresponding record in the other table, it is not included in the result set.
On the other hand, operations like Left Join, Right Join, and Full Outer Join do preserve non-matched tuples.
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