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Databases SQL Basics Finding the Data You Want Review & Practice with SQL Playgrounds

Posted by sv vs
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sv vs
Full Stack JavaScript Techdegree Student 925 Points

Im a little bit confused about the difference between these two options in the quiz, help!!

I accidentally got the answer right but I dont know how to explain it myself. I don't know the difference between these 2 queries:

Quiz Question: Imagine you wanted to retrieve all appointments in for the upcoming week. Monday is 7th Oct 2019, and Friday is 11th Oct 2019. Which queries is the correct one to use?

A. SELECT * FROM appointments WHERE day > "2019-10-07" AND day < "2019-10-11";

B. SELECT * FROM appointments WHERE day BETWEEN "2019-10-07" AND "2019-10-11";

The correct answer is B. Do the operator such as greater than and smaller than only apply to objects that are not strings? Or is it because I have to used >= and <= if I want to make the answer A correct? I think I miss that one.

1 Answer

Joseph Yhu
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Joseph Yhu
PHP Development Techdegree Graduate 48,638 Points

Or is it because I have to used >= and <= if I want to make the answer A correct?

Yes because it's asking for all five days of the week, including the two dates specified, and the keyword BETWEEN is inclusive while the comparison operators < and > are not.