Analyzing heart disease

There is the link to the lesson.

I was wondering why the “hint” for step 2 used

WHERE Cholesterol IN
(SELECT Cholesterol FROM panels LIMIT 1);

Instead of

WHERE Cholesterol IS ‘Cholesterol’;

Is there a reason or is it preference?

Is it a matter of flexibility since I can change the limit to extend how much is deleted from the table?


I was wondering the same as you about the hint. However, I’ve looked up the reference in SQLite and this kind of form of sub-query is allowed and I think very practical.
My problem is that their code doesn’t work in the course interface. I’ve sent them a bug report… nor reply yet.

If I get any answer, I’ll post it here.

Hi remitropcuit,

I have encountered a similar problem where code from the hint of task 4 is not working. I am assuming this is a problem of their server. Here is a link to my issue (which I think is quite similar).


I used


And that worked to delete the duplicate row.

Heart disease is not a common disease to treat and requires a sufficient amount of price. If you are suffering from any heart disease and interested to take the health insurance plans then you can take these plans from The Health Exchange Agency
Mutual of Omaha health insurance
Mutual of Omaha Medicare supplement
Mutual of Omaha medicare
Mutual of Omaha supplement
Mutual of Omaha Medicare supplement plan F rates
Mutual of Omaha Medicare supplement plan G rates
AARP Medicare supplement plan G
Medicare plan F high deductible
Medigap plan G
supplement quotes
They will help you to provide the best plans with a budget friendly price.