Practice Problems - Write 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.
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 to 90 in the final test (test_name column).
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.
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.
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.
What to do next¶
Click on the following link to go to the post test: Post Test