use ngcp;

create table date_range_helper (d date, index (d));
insert into date_range_helper select adddate('1970-01-01',d4.i*10000 + d3.i*1000 + d2.i*100 + d1.i*10 + d0.i) from 
(select 0 as i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) d0, 
(select 0 as i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) d1, 
(select 0 as i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) d2, 
(select 0 as i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) d3, 
(select 0 as i union select 1 union select 2) d4;