How to insert same data for diffrent date

Question

please help
I need to insert this data in abc using one single query or pl sql code .
Please assume tab has more than 10 years of data and having millions of record
insert into abc
select count(distinct id) from tab where date = sysdate - 45
insert into abc
select count(distinct id) from tab where date = sysdate - 105
insert into abc
select count(distinct id) from tab where date = sysdate - 195
insert into abc
select count(distinct id) from tab where date = sysdate - 380
insert into abc
select count(distinct id) from tab where date = sysdate - 745
thanks and advance

Answer 1

Hi,
I understand you want to scan the table only once... There is a way to accomplish that (probably easier and more readable then the one I give here also exists), but one thing sure, the tab is scanned once only here:
with counts as (select
                count(distinct case when t.date>=sysdate - 45 then t.id else null end) c1,
                count(distinct case when t.date>=sysdate - 105 then t.id else null end) c2,
                count(distinct case when t.date>=sysdate - 195 then t.id else null end) c3,
                count(distinct case when t.date>=sysdate - 380 then t.id else null end) c4,
                count(distinct case when t.date>=sysdate - 745 then t.id else null end) c5
                from tab t)
select case when l.rn=1 then cnt.c1
            when l.rn=2 then cnt.c2
            when l.rn=3 then cnt.c3
            when l.rn=4 then cnt.c4
            when l.rn=5 then cnt.c5
            end sums
from  counts cnt,
     (select rownum rn from dual connect by level <=5) l;What's happening here is
1) we get all counts as 5 columns in one row
2) we put value of each column in a new row
I'm not sure the complexity is worth the result in your case..
Maris