Question : query question

Hi Experts,

In my database I've got two tables with the exact same field layout.

Table1 (called "personen") has a basic recordset plus a number of aditional records compared to Table 2(called "sportlink") that has only the basic set.
The difference in table1 between the basic recordset and the aditional records is that the basic set has a specific unique field filled and the aditionals don't have this field filled. This field is called "KNVBnr".

Now I'd like to compair both tables based only on the fields that have a filled value in the field KNVBnr. So the aditional records in table1 should be left out from the compare.
I want to know the difference between both tables in both ways and like to do this in two queries.

I've tied to build the fist one but without the wanted result.
My best effort is:

SELECT * FROM sportlink LEFT JOIN personen ON personen.KNVBnr = sportlink.KNVBnr WHERE personen.KNVBnr IS NULL

Hope you understand and can help me.

Answer : query question

try this

select * from sportlink where KNVBnr not in (select KNVBnr from personen)