Aggregation Error Message

[cheid_4838]

I need to pull the company id related to the last billable stop in a series of stops(deliveries) where the following conditions are met:

1. The order number is the same in both the stops table and order header table.
2. The stops must have billable codes LUL, LLD, DRL, and HPL in the stops event column (s.stp_event).
3. Since I want the company id related last billable stop I want the MAX stop sequence (s.stp_sequence) number which identifies each stop (1, 2, 3, etc.).

I am having trouble getting the aggregation to work in the statement below. Am I missing something with this logic. Your help is greatly appreciated.

(SELECT cmp_id from stops s (nolock) where s.ord_hdrnumber = o.ord_hdrnumber and s.stp_event in ('LUL','LLD','DRL', 'HPL') and s.stp_sequence = MAX(s.stp_sequence)) as ReceiverID

Error Message: An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list, and the column being aggregated is an outer reference.

[v-yiruan-msft · Accepted solution]

Hi @cheid_4838 ,

It looks like you're running into an issue with using an aggregate function ('MAX()') directly in the 'WHERE' clause, which is not permitted in SQL. Please update your SQL statement as below and check if it can work or not...

SELECT s.cmp_id AS ReceiverID
FROM stops s (nolock)
JOIN (
    SELECT ord_hdrnumber, MAX(stp_sequence) AS max_sequence
    FROM stops
    WHERE stp_event IN ('LUL', 'LLD', 'DRL', 'HPL')
    GROUP BY ord_hdrnumber
) max_stops
ON s.ord_hdrnumber = max_stops.ord_hdrnumber
   AND s.stp_sequence = max_stops.max_sequence

Best Regards