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The given Query can also be replaced with_______:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID= teaches_ID;
FROM instructor, teaches
WHERE instructor_ID= teaches_ID;
- a)Select name,course_id from teaches,instructor where instructor_id=course_id;
- b)Select name, course_id from instructor natural join teaches;
- c)Select name, course_id from instructor;
- d)Select course_id from instructor join teaches;
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The given Query can also be replaced with_______:SELECTname,course_idF...
Explanation:
The given query is:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID = teaches_ID;
This query retrieves the name and course_id from two tables, instructor and teaches, based on the condition that the instructor_ID is equal to the teaches_ID.
The given options are:
a) Select name, course_id from teaches, instructor where instructor_id = course_id;
b) Select name, course_id from instructor natural join teaches;
c) Select name, course_id from instructor;
d) Select course_id from instructor join teaches;
Option B: Select name, course_id from instructor natural join teaches;
Explanation:
In the given query, "natural join" is used to combine the instructor and teaches tables. It automatically matches the columns with the same names in both tables and returns the result.
The resulting table will contain only the common columns (name and course_id) from both tables. This is why the SELECT statement retrieves only the name and course_id.
Using the natural join eliminates the need to explicitly define the join condition in the WHERE clause. It simplifies the query and makes it easier to read and understand.
Advantages of Option B:
- More concise and readable: Using natural join eliminates the need to explicitly specify the join condition, making the query simpler and easier to understand.
- Automatically matches columns: Natural join matches the columns with the same names in both tables, reducing the chances of errors in specifying the join condition.
- Efficient: By automatically matching the columns, natural join reduces the amount of data that needs to be processed, resulting in better performance.
Conclusion:
Option B is the correct answer as it provides a more concise and efficient way to retrieve the name and course_id from the instructor and teaches tables. The use of natural join simplifies the query and improves readability.
The given query is:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID = teaches_ID;
This query retrieves the name and course_id from two tables, instructor and teaches, based on the condition that the instructor_ID is equal to the teaches_ID.
The given options are:
a) Select name, course_id from teaches, instructor where instructor_id = course_id;
b) Select name, course_id from instructor natural join teaches;
c) Select name, course_id from instructor;
d) Select course_id from instructor join teaches;
Option B: Select name, course_id from instructor natural join teaches;
Explanation:
In the given query, "natural join" is used to combine the instructor and teaches tables. It automatically matches the columns with the same names in both tables and returns the result.
The resulting table will contain only the common columns (name and course_id) from both tables. This is why the SELECT statement retrieves only the name and course_id.
Using the natural join eliminates the need to explicitly define the join condition in the WHERE clause. It simplifies the query and makes it easier to read and understand.
Advantages of Option B:
- More concise and readable: Using natural join eliminates the need to explicitly specify the join condition, making the query simpler and easier to understand.
- Automatically matches columns: Natural join matches the columns with the same names in both tables, reducing the chances of errors in specifying the join condition.
- Efficient: By automatically matching the columns, natural join reduces the amount of data that needs to be processed, resulting in better performance.
Conclusion:
Option B is the correct answer as it provides a more concise and efficient way to retrieve the name and course_id from the instructor and teaches tables. The use of natural join simplifies the query and improves readability.
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Community Answer
The given Query can also be replaced with_______:SELECTname,course_idF...
Join clause joins two tables by matching the common column
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The given Query can also be replaced with_______:SELECTname,course_idFROMinstructor,teachesWHEREinstructor_ID=teaches_ID;a)Select name,course_id from teaches,instructor where instructor_id=course_id;b)Select name, course_id from instructor natural join teaches;c)Select name, course_id from instructor;d)Select course_id from instructor join teaches;Correct answer is option 'B'. Can you explain this answer?
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