Practice Problems - Mixed-up Code

Now, let’s spend 15 minutes to practice what we just learned!

Please do not refer back to the previous page or outside resources.

You can stop working on a problem after you worked on it for about three minutes without solving it.

Problems

In the grades table:

Please write a SELECT statement to retrieve the student_id, test_name, and english of all entries whose english is lower than 60 and math is higher than 90.

--blocks-- SELECT student_id, test_name, english FROM grades WHERE english < 60 AND math > 90 english < 60 & math > 90

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In the grades table:

A student completed an extra assignment and got some additional points.

Please write an UPDATE statement to change the entry whose student_id is 1, and set their math score for final test_name to 90.

--blocks-- UPDATE grades SET math = 90 WHERE student_id = 1 AND test_name = "final" LET student_id = 1 AND test_name = final

In the grades table:

The instructors decided to add some points to all students as one test was too difficult.

Please write an UPDATE statement to change all entries whose test_name is midterm, and add 10 points to their english score.

--blocks-- UPDATE grades SET english = english + 10 WHERE test_name = "midterm" english + 10

Aside from the grades table:

We also have a students table:

Now we want to match the student name to their math grades.

Please write a statement using SELECT and JOIN to: select the test_name and math from the grades table and name from the students table, where the student_id in the grades table is the same as the id in the students table.

--blocks-- SELECT grades.test_name, grades.math, students.name FROM grades JOIN students ON students.id = grades.student_id ON students.id = grades.id

Aside from the grades table:

We also have a tests table:

Now we want to add the date information to the grades to see when the students took the tests.

Please write a statement using SELECT and JOIN to: select the date and name from the tests table and student_id from the grades table, where the test_name in the grades table is the same as the name in the tests table.

--blocks-- SELECT tests.date, tests.name, grades.student_id FROM tests JOIN grades ON grades.test_name = tests.name

What to do next

Click on the following link to go to the post test: Post Test

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