Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > The given Query can also be replaced with____...
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The given Query can also be replaced with_______:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID= teaches_ID;
SELECT name, course_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?
Most Upvoted Answer
The given Query can also be replaced with_______:SELECT name, course_i...
Explanation:
The given query:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID = teaches_ID;
is used to retrieve the names and course IDs of instructors who are teaching courses. The tables involved in this query are "instructor" and "teaches".
The options provided for replacing the given query are as follows:
a) Select name, course_id from teaches, instructor where instructor_id = course_id;
This option is incorrect because it is trying to select the name and course ID from the "teaches" and "instructor" tables without specifying the joining condition between them. The condition "instructor_id = course_id" is incorrect as it does not establish a proper relationship between the two tables.
b) Select name, course_id from instructor natural join teaches;
This option is correct because it uses the "natural join" operation to join the "instructor" and "teaches" tables. The "natural join" operation automatically matches the columns with the same name in the two tables and returns the result. In this case, it will match the "instructor_id" column from the "instructor" table with the "teaches_id" column from the "teaches" table.
c) Select name, course_id from instructor;
This option is incorrect because it only selects the name and course ID from the "instructor" table without considering the relationship with the "teaches" table. It will not provide the desired result of retrieving the names and course IDs of instructors who are teaching courses.
d) Select course_id from instructor join teaches;
This option is incorrect because it only selects the course ID from the "instructor" table without selecting the instructor's name. It also does not specify the joining condition between the "instructor" and "teaches" tables.
Therefore, the correct option to replace the given query is Option B - Select name, course_id from instructor natural join teaches; as it properly joins the "instructor" and "teaches" tables and retrieves the desired columns.
The given query:
SELECT name, course_id
FROM instructor, teaches
WHERE instructor_ID = teaches_ID;
is used to retrieve the names and course IDs of instructors who are teaching courses. The tables involved in this query are "instructor" and "teaches".
The options provided for replacing the given query are as follows:
a) Select name, course_id from teaches, instructor where instructor_id = course_id;
This option is incorrect because it is trying to select the name and course ID from the "teaches" and "instructor" tables without specifying the joining condition between them. The condition "instructor_id = course_id" is incorrect as it does not establish a proper relationship between the two tables.
b) Select name, course_id from instructor natural join teaches;
This option is correct because it uses the "natural join" operation to join the "instructor" and "teaches" tables. The "natural join" operation automatically matches the columns with the same name in the two tables and returns the result. In this case, it will match the "instructor_id" column from the "instructor" table with the "teaches_id" column from the "teaches" table.
c) Select name, course_id from instructor;
This option is incorrect because it only selects the name and course ID from the "instructor" table without considering the relationship with the "teaches" table. It will not provide the desired result of retrieving the names and course IDs of instructors who are teaching courses.
d) Select course_id from instructor join teaches;
This option is incorrect because it only selects the course ID from the "instructor" table without selecting the instructor's name. It also does not specify the joining condition between the "instructor" and "teaches" tables.
Therefore, the correct option to replace the given query is Option B - Select name, course_id from instructor natural join teaches; as it properly joins the "instructor" and "teaches" tables and retrieves the desired columns.
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The given Query can also be replaced with_______:SELECT name, course_i...
Join clause joins two tables by matching the common column
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