SQL COUNT* GROUP BY bigger than,

Question

I want to select the distinct keys with the occurence number, this query seems functionate:

SELECT ItemMetaData.KEY, ItemMetaData.VALUE, count(*) 
FROM ItemM         


        

Answer 1

Here is the explanation: WHERE clause introduces a condition on individual rows; HAVING clause introduces a condition on aggregations.

Use WHERE before GROUP BY and HAVING after GROUP BY. It isn't mandatory, but helpuful in most cases.

SELECT 
       ItemMetaData.KEY, ItemMetaData.VALUE, СOUNT(*) 
FROM  ItemMetaData 
GROUP BY
       ItemMetaData.KEY, ItemMetaData.VALUE
HAVING СOUNT(*) > 2500
ORDER BY СOUNT(*) DESC;