1.7.18 CQL: Negation

{[],
 se_lt_x :: [a-A, b-B],
 \+ exists se_lt_y :: [d-A]}

The generated SQL is:

SELECT
  x39.a, x39.b
 FROM
  se_lt_x x39
 WHERE NOT EXISTS (SELECT * FROM se_lt_y y13 WHERE x39.a = y13.d)