Question
Which type of join retrieves records from two tables where
there is no matching entry in the second table?Solution
A Left Outer Join retrieves all records from the first (left) table and the matching records from the second (right) table. If there are no matches, the result will include NULL values for columns from the second table. For instance, in a join between "employees" and "departments," if an employee doesn’t belong to any department, their record will still appear in the output, with department details as NULL. Why Other Options Are Incorrect:
- Inner Join: Only retrieves matching records from both tables, excluding unmatched entries.
- Full Outer Join: Includes all records from both tables, with NULLs for non-matching entries from either side.
- Right Outer Join: Retrieves all records from the second (right) table and matches from the first.
- Cross Join: Produces a Cartesian product, pairing all rows in the first table with all rows in the second, regardless of matching conditions.
Select the option in which the numbers are related in the same way as are the numbers of the following set.
(9, 14, 131)
In the following question, select the related number from the given alternatives.
68 : 70 :: 45: ?
Change the question mark with the option that follows the logic applied to the first pair.
Q : H : S : ??
If 31 @ 9 = 24 and 53 @ 33 = 96, then 19 @ 47 = '?'.
A # B means ‘A is the sister of B’
A @ B means ‘A is the daughter of B’
A & B means ‘A is the husband of B’
A % B m...
Select the set of numbers that is similar to the following set:
(11, 133, 56)
Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to th...
Select the set in which the numbers are not related in the same way as are the numbers of the following set. NOTE: Operations should be performed on th...
Select the word-pair in which the two words are related in the same way as are the two words in the following pair.
Molasses : Sugar
If 35 @ 18 = 66 and 49 @ 22 = 136, then 23 @ 44 = '?'.