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I wonder if you wanted to make one SELECT, then just put it on SELECT in large print:
SELECT CNES FROM Table
Or for example if you want to select the two:
SELECT cnes,CNES FROM Table
But I think for reasons like this it would be better to change the name of the column to something easier to distinguish.
EDIT: I didn’t notice it was a question about Oracle SQL, but I guess it’s the same. Correct me if I’m wrong! :)