SQL
Question
which join is used to join a table with itself
- Inner join
- full join
- self join
does the virtual table created occupy space for the operation to joining with itself?
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Answer ( 1 )
Self JOIN: It is a regular join, but the table is joined with itself.
Explanation: Self-join will create a virtual table that is a copy of the table itself to join which last for the moment of operation and doesn’t occupy any extra space, as the table is a copy of the existing table.
Q. which join is used to join a table with itself?
Inner join
full join
self join
Answer : Self Join
Reason : Self-join is a join in which a table is joined with itself which last for the operation duration and doesn’t occupy any extra space, as the table is just a reference to the existing table.