date - PL/SQL find values within nested tables -


hi have problem don't know if can help. i've created nested tables , inserted values in in table. 

create or replace type tt_hours object(hours integer, data number); / create or replace type tt_day varray(7) of tt_hours; / create table nem_rm16 (   day                 date,   value_hours         tt_day  ); insert nem_rm16    (day, value_hours)  values    (to_date('01/06/2012 22:00:34'),       tt_day(                 tt_hours(1,0.025727),                 tt_hours(2,0.012047),                 tt_hours(3,0.012857),                 tt_hours(4,0.012107),                 tt_hours(5,0.012849),                 tt_hours(6,0.01215),                 tt_hours(7,0.0129)));

so there 30 rows inserted in new_table each representing 1 day of month in month (june). above example of first row day = 01/06/2012 8 hours of data.

how write program find average hour specific day e.g average of first hour of mondays in table (god hope i'm making sense).

the result should 7 rows (7 days in week) 

tt_hours (1, average on month) tt_hours (2, average on month) ..........

second table:

 create table old_table ( tday date, value_thours tt_day );

i've tried insert using following. insert result in old table did not work.

insert old_table (day, value_hours) values     (select to_char(day, 'day'),     hours, avg(data) nem_rm16 n, table(n.value_hours) v    group to_char(day, 'day'), hours);

e.g old_table should have following data in friday after running select statement. hours , date in nested table , tdate date type. can see result select statement produced inserted same structured table.

  tdate         hours        data    ----------- ---------- ----------   friday               1   0,025727   friday               2   0,012047   friday               3   0,012857   friday               4   0,012107   friday               5   0,012849   friday               6    0,01215   friday               7     0,0129

you can use lateral join retrieve values nested tables:

sql> select n.day, v.hours, v.data nem_rm16 n, table(n.value_hours) v;  day              hours       data ----------- ---------- ---------- 01/06/2012           1   0,025727 01/06/2012           2   0,012047 01/06/2012           3   0,012857 01/06/2012           4   0,012107 01/06/2012           5   0,012849 01/06/2012           6    0,01215 01/06/2012           7     0,0129

i'm not sure understand question correctly above query can run aggregation, such as:

sql> select to_char(day, 'day') day_of_week, hours, avg(data) avg_data   2    nem_rm16 n, table(n.value_hours) v   3   group to_char(day, 'day'), hours;  day_of_week      hours   avg_data ----------- ---------- ---------- friday               1   0,025727 friday               2   0,012047 friday               3   0,012857 friday               4   0,012107 friday               5   0,012849 friday               6    0,01215 friday               7     0,0129

use collect if want reconstruct nested table, e.g:

select day_of_week, cast(collect(tt_hours(hours, avg_data)) tt_day)   (select to_char(day, 'day') day_of_week, hours, avg(data) avg_data           nem_rm16 n, table(n.value_hours) v          group to_char(day, 'day'), hours)  group day_of_week

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