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A LEFT JOIN in SQL returns all records from the left table (the first table specified in the query) and the matched records from the right table. If there is no match, the result will contain NULL values in columns from the right table. This join type is particularly useful in scenarios where you need to keep all data from the primary table, even if corresponding records do not exist in the related table. It is commonly used when performing analyses requiring comprehensive data from one table while optionally pulling related data from another. The other options are incorrect because: • Option 1 (INNER JOIN) only returns rows with matching values in both tables. • Option 3 (RIGHT JOIN) returns all rows from the right table, not the left. • Option 4 (FULL JOIN) includes all matching and non-matching rows from both tables. • Option 5 (CROSS JOIN) returns the Cartesian product without any filtering on matching keys.
Which of the following represent a 20% increase and a 10% decrease, respectively?
In a ward member election, a candidates secure 67% of the votes and is elected by majority of 5100 votes. The total number of votes polled is?
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In physics examination a student scored 45% marks in the first paper out of 160. How much percent marks should he score in the second paper out of 140 ...
The ratio of the monthly earning of A to that of B is 5:7.If monthly earning of A increased by 25% and that of B decreased by 60% the new ration between...