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Claire Brehm
9,098 PointsSQL reporting by example quiz, complete code question
I have tried to answer this question and still can pass the quiz without getting it right, but would like to know what the answer is for my own knowledge. Here is the question:
Write a query to find out which managers have more than 5 people on their team. If you need to use a count, use 'COUNT(1)'.
SELECT MANAGERS.FIRST_NAME, MANAGERS.LAST_NAME FROM MANAGERS JOIN EMPLOYEES ON EMPLOYEES.MANAGER_ID = MANAGERS.ID GROUP BY MANAGERS.ID ____________ ;
The answer needs to be added where the _____ is.
Thanks!
1 Answer
KRIS NIKOLAISEN
54,971 PointsI tried flipping through the videos to see if COUNT(1) was used but couldn't find it. The SQLite documentation was a little helpful. But I found this article to be the most interesting.
In my own testing with a SQLite database any non null value entered into the COUNT() function returned the number of records in a group. So COUNT(1), COUNT("monkey"), COUNT(1000), COUNT(*) all did the same thing.
I think the quiz specifies to use COUNT(1) as it seems to be the convention and also so all the variations wouldn't have to be considered by the tester. Long story short your answer is HAVING COUNT(1) > 5.