select users have more than one distinct records in mysql

Question

For a table that holds the records of user\'s webpages visiting behavior, how can I select users that visit more than one webpages.

The structure of this tables is:<

Answer 1

just add having clause

SELECT userId, COUNT(DISTINCT webpageId) AS count 
FROM visits 
GROUP BY userId
HAVING COUNT(DISTINCT webpageId) > 1

but if you only what the ID

SELECT userId
FROM visits 
GROUP BY userId
HAVING COUNT(DISTINCT webpageId) > 1

• SQLFiddle Demo

the reason why you are filtering on HAVING clause and not on WHERE is because, WHERE clause cannot support columns that where aggregated.