SQL Server how can I use COUNT DISTINCT(*) in HAVING clause? -

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i have procedure counts unique [customerid] values , displays them in select list. i'm trying sort [customerid] "> 1" using having clause, sql won't let me use distinct count inside having. in mind makes sense having should work count not: 

use mycompany; go select distinct count(customerid) numberofordersmade, customerid  customerid tblitems_ordered group customerid having distinct count(customerid) > 1 go

you want select count(distinct orderid) instead of distinct count(customerid):

use mycompany; go select count(distinct orderid) numberofordersmade, customerid customerid tblitems_ordered group customerid having count(distinct orderid) > 1 go

when outside of count, distinct eliminate duplicate rows result set, have no effect in query because doing group by. when inside count, distinct limit count unique values of column pass count function. thus, makes more sense use orderid column instead of customerid when you're aliasing numberofordersmade.


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