Computer Science
Assertion. The join, in which columns are compared for equality, is called Equi-join.
Reason. The join queries only produce combined rows from tables having some common column, when compared for equality.
SQL Joins & Grouping
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Answer
(c)
Assertion is true but Reason is false.
Explanation
The join, in which columns are compared for equality, is called Equi-join. Join queries in SQL can produce combined rows based on various conditions, not just equality comparisons. For example, join conditions can involve inequality comparisons (<, >, <=, >=), as well as other logical operators and functions.
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Related Questions
Assertion. SQL SELECT query can also fetch rows from multiple tables.
Reason. A join is a query that combines rows from two or more tables.
Assertion. Generally, a join query combines rows from multiple tables having some common column(s) and a joining condition, but not always.
Reason. A Cartesian product is an unrestricted join where all possible combinations of rows from multiple tables are created without any condition on them.
Assertion. In the result produced by a join query, there may be multiple identical columns in the final result, but not always.
Reason. The join in which only one of the identical columns (coming from the joined tables) exists, is called a Natural join.
Assertion. In order to carry out the join operation, there should be a governing condition.
Reason. A join condition may be based on equality, less than, greater than or non-equality.