Grouping of Data in Advanced Datagrid

Question

Hii,
I need to group the data in advanced datagrid. I used the Grouping collection class, but it it not working.
My advanced datagrid has column groups...so will this have any impact on grouping.
Thanks!!
Vikas

Answer 1

Assuming that the table (say WALK_IN_PER_LOG) that you have has atleast the following two columns
walk_in_date DATE -- holds date time stamp
dob DATE -- holds date of birth
SELECT TO_CHAR(walk_in_date,'WW')| |'-'| |TO_CHAR(walk_in_date,'DAY') "Week#-Day"
,TO_CHAR(TRUNC(TO_CHAR(walk_in_date,'HH24')/02),'09')| |'-'| |
TO_CHAR(TRUNC(TO_CHAR(walk_in_date,'HH24')/02)+2,'09')
,COUNT(*)
FROM walk_in_per_log
WHERE MONTHS_BETWEEN(SYSDATE,dob) > 18*12
GROUP BY TO_CHAR(walk_in_date,'WW')| |'-'| |TO_CHAR(walk_in_date,'DAY')
,TO_CHAR(TRUNC(TO_CHAR(walk_in_date,'HH24')/02),'09')| |'-'| |
TO_CHAR(TRUNC(TO_CHAR(walk_in_date,'HH24')/02)+2,'09')
PS I might have complicated the query a little in trying to get the formatting as you had requested but the principle is simple
First group by the day, so that all events of one day can be compared together, then extract the hour portion of each of those dates and divide by 2 and use the quotient of the division as a grouping factor.
eg
from hours
00-02 the quotient is 0 (2 is taken as 1:59:59)
02-04 the quotient is 1 (4 is taken as 3:59:59)
and so on
hope this helps....