'interpretation of 'having' clause in sql

I just recently started learning SQL and MySQL. It's interesting but confusing. Here I have 3 queries; I am confused and can't get the differences in the queries because I get different output each time. Can you explain the exact meaning of the queries and what is the difference from each other.

Query 1:

SELECT CustomerID, Country
FROM Customers
GROUP BY Country
HAVING Count(CustomerID) >5;

Quesry 2:

SELECT Count(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING CustomerID >5;

Query 3:

SELECT Count(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING Count(CustomerID) >5;
mysql


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