delete from very_strange_table
where (d1 =0  or d1 is null)
and (d2 =  0  or d2 is null)
and (d3 =  0  or d3 is null)
and (d4 =  0  or d4 is null)
and (d5 =  0  or d5 is null)
and (d6 =  0  or d6 is null)
and (d7 =  0  or d7 is null)
and (d8 =  0  or d8 is null)
and (d9 =  0  or d9 is null)
and (d10 =  0  or d10 is null)
and (d11 =  0  or d11 is null)
and (d12 =  0  or d12 is null)
and (d13 =  0  or d13 is null)
and (d14 =  0  or d14 is null)
and (d15 =  0  or d15 is null)
and (d16 =  0  or d16 is null)
and (d17 =  0  or d17 is null)
and (d18 =  0  or d18 is null)
and (d19 =  0  or d19 is null)
and (d20 =  0  or d20 is null)
and (d21 =  0  or d21 is null)
and (d22 =  0  or d22 is null)
and (d23 =  0  or d23 is null)
and (d24 =  0  or d24 is null)
and (d25 =  0  or d25 is null)
and (d26 =  0  or d26 is null)
and (d27 =  0  or d27 is null)
and (d28 =  0  or d28 is null)
and (d29 =  0  or d29 is null)
and (d30 =  0  or d30 is null)
and (d31 =  0  or d31 is null);