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I would like to know what are the differences between using:
SELECT email, COUNT( email ) AS total
FROM `newsletter`
GROUP BY email having total>1
or
SELECT count(*) as total, email
FROM 'newsletter'
GROUP BY email having total > 1
Both give same results but what else is counting count(*) than the emails?
There’s at least one difference.
emailcan containNULL.For more information, see this article.