CREATE TABLE `t` (`i` INT AUTO_INCREMENT, PRIMARY KEY(`i`));
INSERT INTO t (i) VALUES(1),(2),(3),(4),(5),(6),(7),(8);

select
    t1.i as i1,
    t2.i as i2,
    t3.i as i3,
    t4.i as i4,
    t5.i as i5,
    t6.i as i6,
    t7.i as i7,
    t8.i as i8
from t t1
inner join t t2
on t2.i not in (t1.i,t1.i-1,t1.i+1)
inner join t t3
on t3.i not in (t1.i,t2.i,t2.i-1,t2.i+1,t1.i-2,t1.i+2)
inner join t t4
on t4.i not in (t1.i,t2.i,t3.i,t3.i-1,t3.i+1,t2.i-2,t2.i+2,t1.i-3,t1.i+3)
inner join t t5
on t5.i not in (t1.i,t2.i,t3.i,t4.i,t4.i-1,t4.i+1,t3.i-2,t3.i+2,t2.i-3,t2.i+3,t1.i-4,t1.i+4)
inner join t t6
on t6.i not in (t1.i,t2.i,t3.i,t4.i,t5.i,t5.i-1,t5.i+1,t4.i-2,t4.i+2,t3.i-3,t3.i+3,t2.i-4,t2.i+4,t1.i-5,t1.i+5)
inner join t t7
on t7.i not in (t1.i,t2.i,t3.i,t4.i,t5.i,t6.i,t6.i-1,t6.i+1,t5.i-2,t5.i+2,t4.i-3,t4.i+3,t3.i-4,t3.i+4,t2.i-5,t2.i+5,t1.i-6,t1.i+6)
inner join t t8
on t8.i not in (t1.i,t2.i,t3.i,t4.i,t5.i,t6.i,t7.i,t7.i-1,t7.i+1,t6.i-2,t6.i+2,t5.i-3,t5.i+3,t4.i-4,t4.i+4,t3.i-5,t3.i+5,t2.i-6,t2.i+6,t1.i-7,t1.i+7)