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create table Tab1 ( id int ); insert into Tab1 values (1), (2); create table Tab2 ( id int, Tab1Id int ); insert into Tab2 values (10,1), (20,1), (30,2), (40,2); create table Tab3 ( id int, Tab2Id int ); insert into Tab3 values (100,10), (200,10), (300,20); create table Tab4 ( id int, Tab3Id int ); insert into Tab4 values (1000,100);
SELECT t1.id FROM Tab1 t1 WHERE id NOT IN ( SELECT t2.Tab1Id FROM Tab2 t2 INNER JOIN Tab3 t3 on t3.Tab2Id=t2.id INNER JOIN Tab4 t4 on t4.Tab3Id=t3.id )
id
2