The derived table accounts for the fact that there are multiple records for each tracking_number. It is summing all the net_amount columns for each tracking_number. Then the rest of the query is trying to generate data to drive a histogram with bins that are 3 digits apart.

```
SELECT
COUNT( s.tracking_number ) AS freq
, SUM( s.net_amount ) - ( SUM( s.net_amount ) mod3 ) AS label
FROM (
SELECT b.tracking_number, SUM( b.net_amount ) AS net_amount
FROM gvdb_gs_ups_billing AS b
GROUP BY b.tracking_number
) AS s
GROUP BY
SUM( s.net_amount ) - ( SUM( s.net_amount ) mod3 )
ORDER BY
SUM( s.net_amount ) - ( SUM( s.net_amount ) mod3 ) ASC
```

This is the error I am getting:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘mod3 ) AS label FROM ( SELECT b.tracking_number , SUM( b.net_amount ) as net_a’