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If a set is a collection of values given by the select clause, The ______ connective tests for set membership
- a)within
- b)include
- c)under
- d)in
Correct answer is option 'D'. Can you explain this answer?
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If a set is a collection of values given by the select clause, The ___...
Answer:
The correct answer is option 'D': in.
In SQL, a set is a collection of values given by the SELECT clause. The SELECT clause is used to retrieve data from a database table or view. It specifies the columns to be returned in the result set.
The connective that tests for set membership is the 'in' operator. It is used to check if a value is present in a set of values. The 'in' operator is typically used in the WHERE clause of a SQL query to filter the results based on a condition.
Here is an example to illustrate the usage of the 'in' operator:
Suppose we have a table called "students" with columns "id" and "name". We want to retrieve all the students whose names are either "John", "Mary", or "Alice". We can use the 'in' operator in the WHERE clause as follows:
SELECT * FROM students WHERE name IN ('John', 'Mary', 'Alice');
In this example, the 'in' operator tests if the value of the "name" column is present in the set of values ('John', 'Mary', 'Alice'). If the value matches any of the values in the set, the corresponding row will be included in the result set.
The 'in' operator can also be used with subqueries to test for set membership. For example, we can use a subquery to retrieve a set of values and then use the 'in' operator to check if a value is present in that set.
Overall, the 'in' operator is a powerful tool in SQL for testing set membership and filtering query results based on a condition.
The correct answer is option 'D': in.
In SQL, a set is a collection of values given by the SELECT clause. The SELECT clause is used to retrieve data from a database table or view. It specifies the columns to be returned in the result set.
The connective that tests for set membership is the 'in' operator. It is used to check if a value is present in a set of values. The 'in' operator is typically used in the WHERE clause of a SQL query to filter the results based on a condition.
Here is an example to illustrate the usage of the 'in' operator:
Suppose we have a table called "students" with columns "id" and "name". We want to retrieve all the students whose names are either "John", "Mary", or "Alice". We can use the 'in' operator in the WHERE clause as follows:
SELECT * FROM students WHERE name IN ('John', 'Mary', 'Alice');
In this example, the 'in' operator tests if the value of the "name" column is present in the set of values ('John', 'Mary', 'Alice'). If the value matches any of the values in the set, the corresponding row will be included in the result set.
The 'in' operator can also be used with subqueries to test for set membership. For example, we can use a subquery to retrieve a set of values and then use the 'in' operator to check if a value is present in that set.
Overall, the 'in' operator is a powerful tool in SQL for testing set membership and filtering query results based on a condition.
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If a set is a collection of values given by the select clause, The ___...
The in connective is used to test for the membership in a set, where the set is a collection of values given by the select clause.
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