Question

I want to do a request to my table where I select the rows where I found one times the customer id

My table structure looks like this:

id , date_commande, id_customer

I don’t want to return the lines if I found customer id twice or more

example of data:

id  | date_commande | id_customer
--------------------------------
01  |   2011-12-01  |     10
02  |   2011-12-01  |     11
03  |   2011-12-02  |     14
04  |   2011-12-03  |     10

I want just return the line

id  | date_commande | id_customer
--------------------------------
02  |   2011-12-01  |     11
03  |   2011-12-02  |     14

Answer 1

This is a slightly improved version of the query that @Florin suggested..

Select ID, date_commande, ID_customer
from table
where ID_Customer in
(Select ID_Customer from table Group by ID_Customer having count(*) = 1)