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We made this test on my school, and according to the test this is the right answer:
SELECT
names
FROM
COMPANY
WHERE
NOT EXISTS (SELECT
kgmilk
FROM
COWS
WHERE kgmilk < 1000 AND COMPANY.nr = COWS.nr)
Now my question is, can you actually do COMPANY.nr = COWS.nr in the nested query, since you only select one database in that query.
You didn’t specify which kind of SQL this is.
If it’s MS SQL Server,
COMPANY.nr = COWS.nris possible.See this example.