I have a select such as:

SELECT Invoice.Numero
 FROM Invoice
 WHERE Invoice.NoClient IN (5,44,52,54,55,57,58,59,60,61,62,63,64,65,66,67,68,70,71,72,73,69,74,75,76,77,78,80)

Then, we could have another one such as:

SELECT Invoice.Numero
 FROM Invoice
 WHERE Invoice.NoClient2 IN (79)

I need to combine both selects into one which would return only the records where Invoice.NoClient and Invoice.NoClient2 match in both.

For example, in the example above, none would be returned.

However, if I would have this:

SELECT Invoice.Numero
 FROM Invoice
 WHERE Invoice.NoClient IN (5,44,52,54,55,57,58,59,60,61,62,63,64,65,66,67,68,70,71,72,73,69,74,75,76,77,78,80)

Then, we could have another one such as:

SELECT Invoice.Numero
 FROM Invoice
 WHERE Invoice.NoClient2 IN (5,44,79)

Then, as 5 and 44 match both, this means I would have some results.

What would be the simplest way to achieve that?