Question

There are ton’s of listings on how to find duplicate rows, and remove them, or list out the duplicates. In the masses of responses i’ve tried searching through on here those are the only responses i’ve found. I figured I would just put up my question since its been an hour and still no luck.

This is the example data I have

Table Name: Customers
_____________________________
ID   | CompanyName
--------------
1    | Joes
2    | Wendys
3    | Kellys
4    | Ricks
5    | Wendys
6    | Kellys
7    | Kellys

I need to be able to find all the duplicates in this table, then put the results into another table that lists what the company name is, and how many duplicates it found.

For example the above table I should have a new table that says something like

Table Name: CustomerTotals
_______________________________
ID   | CompanyName  |   Totals
-------------------------------
1    | Joes         |    1
2    | Wendys       |    2
3    | Kellys       |    3
4    | Ricks        |    1

—–EDIT Added after 2 responses, ran into another question——

Thanks for the responses! What about the opposite? say i only want to add items to a new table “UniqueCustomers” from the Customers table that doesn’t exist in CustomerTotals table?

Answer 1

Try this :

INSERT INTO CustomerTotals
(CompanyName, Totals)
SELECT CompanyName, COUNT(*)
FROM Customer
GROUP BY CompanyName

Use an identity column for the ID field.