In RDBMS, which type of Join returns all rows that satisfy the join condition ?
2018
In RDBMS, which type of Join returns all rows that satisfy the join condition ?
Answer: A. Inner Join — Answer: Inner Join Explanation: An inner join returns only the rows from both tables that satisfy the join condition. Rows without matching counterparts in…
- A.
Inner Join
- B.
Outer Join
- C.
Semi Join
- D.
Anti Join
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Correct answer: A
Answer: Inner Join
Explanation: An inner join returns only the rows from both tables that satisfy the join condition. Rows without matching counterparts in the other table are excluded.
SQL example: SELECT * FROM A INNER JOIN B ON A.id = B.a_id; — this returns only rows where A.id equals B.a_id.
Contrast with other joins: Outer join returns matching rows and also includes unmatched rows from one or both tables (LEFT/RIGHT/FULL).
Semi join returns rows from the left table that have a match in the right table but does not return right-table columns in the same way; it is a different concept.
Anti join returns rows from the left table that have no match in the right table (the opposite of matching rows).
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