number series

Patrick Wolf wrote about the newest Apex release, which contains a 11.2 db engine, so I had to play with recursive queries 😉


with t(x) as (select 1 from dual
union all
select x+1 from t where x<5 ) select x from t; X 1 2 3 4 5 with t(x,y) as (select 1 x, 1 y from dual union all select x+1,y*(x+1) from t where x<5 ) select x,y "X!" from t; X X! 1 1 2 2 3 6 4 24 5 120 with t(r,x,y) as (select 1,1,1 from dual union all select r+1,y,x+y from t where r<5) select x fib from t FIB 1 1 2 3 5 with t1(x) as (select 1 from dual union all select x+1 from t1 where x<4), t2(x,y,z) as (select x, 1,x from t1 union all select x,y+1,x*(y+1) from t2 where y<2) select listagg(z,';') within group (order by x) s from t2 group by y; S 1;2;3;4 2;4;6;8

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