Converting SQL Server Query to Oracle - sql

Question

I have the SQL Server query shown below and I am trying to get it to work on Oracle. I have done some looking but am new to Oracle so I am not even sure what I should be looking for. I am hoping that I can make the a query to run adhoc not necessarily a procedure. The basic concept is the following:
Create a temporary table to hold data to be totaled.
Create a date table to get a list of dates.
Build a dynamic query to insert data into the temporary table.
Execute the dynamic query.
Select the summary from the temporary table.
Drop the temporary table
Please remember, I am new to Oracle and I have done some looking. I know that the variables and aliases must be formatted differently and can get the date table but I am not sure the proper Oracle way to create and execute dynamic queries where the table name is the dynamic part. I can create the dynamic string with the correct table name but don't know how to execute it. I have seen some examples but none of them seem to make sense to me for what I am trying to do.
-- Oracle query for dates
with dt (d) as (
select last_day(add_months(sysdate,-2))+1 + rownum - 1
from all_objects
where rownum <= sysdate-last_day(add_months(sysdate,-2))+1+1
)
select 'insert into #tt (cnt, eem, ers, sts) (
select count(1), eem_id, ers_id, sts_id
from event_error' || to_char(D, 'ddmmyy') || ' eve
group by sts_id, eem_id, ers_id); ' "QRY"
from dt;
What I have done in the past is create a bash script which would do the looping through each date and then used the script to summarize the output. This time however I am trying to learn something and I know that there has to be a way to do this in SQL in Oracle.
I appreciate any help or assistance and hope I have explained this well enough.
-- Working SQL Server query
-- declare variables
declare #query varchar(max);
-- create temporary table
create table #tt(cnt int, eem int, ers int, sts int);
-- get a list of dates to process
with dt (d) as
(
select dateadd(month, datediff(month, 0, getdate())-1, 0) as d
union all
select dateadd(dd, 1, d)
from dt
where dateadd(dd, 1, d) <= getdate()
)
-- build the dynamic query
select distinct
#query = stuff ((select 'insert into #tt (cnt, eem, ers, sts) (
select count(1), eem_id, ers_id, sts_id
from event_error' + replace(convert(varchar(5), d, 103), '/', '') + right(year(d), 2) + ' (nolock) eve
group by sts_id, eem_id, ers_id); '
from dt for xml path, type).value(N'.[1]',N'nvarchar(max)')
, 1, 1, N'')
from dt;
-- to execute the dynamic query
execute (#query);
-- query the temporary table
select
[Stream] = sts.sts_name,
[Count] = sum(eve.cnt),
[Error Status] = ers.ers_name,
[Error Number] = eem.eem_error_no,
[Error Text] = eem.eem_error_text
from
#tt eve
inner join
event_error_message eem on eem.eem_id = eve.eem
inner join
error_status ers on ers.ers_id = eve.ers
inner join
stream_stage sts on sts.sts_id = eve.sts
group by
sts.sts_name, eem.eem_error_no, eem.eem_error_text, ers.ers_name
order by
sts.sts_name, eem.eem_error_no, ers.ers_name;
-- drop the temporary table
drop table #tt;

Answer 1

So as I expected, after fighting this all day and finally giving up and asking for help I have an answer. The query below works however if you have improvements or constructive criticism please share as I said, I am trying to learn.
-- create the temporary table
create global temporary table my_tt (
cnt number
, sts number
, eem number
, ers number
)
on commit delete rows;
declare
V_TABL_NM ALL_TABLES.TABLE_NAME%TYPE;
V_SQL VARCHAR2(1024);
begin
for GET_TABL_LIST in (
with dt (d) as (
select last_day(add_months(sysdate,-2))+1 + rownum -1
from all_objects
where rownum <= sysdate-last_day(add_months(sysdate,-2))
)
select 'event_error' || to_char(D, 'ddmmyy') TABLE_NAME from dt
) loop
V_TABL_NM := GET_TABL_LIST.TABLE_NAME;
V_SQL := 'insert into my_tt select count(1), sts_id, eem_id, ers_id from ' || V_TABL_NM || ' group by sts_id, eem_id, ers_id';
execute immediate V_SQL;
end loop;
end;
/
-- the slash is important for the above statement to complete
select
sts.sts_name "Stream"
, sum(eve.cnt) "Count"
, ers.ers_name "Error Status"
, eem.eem_error_no "Error Number"
, eem.eem_error_text "Error Text"
from my_tt eve
inner join event_error_message eem
on eem.eem_id = eve.eem
inner join error_status ers
on ers.ers_id = eve.ers
inner join stream_stage sts
on sts.sts_id = eve.sts
group by sts.sts_name, eem.eem_error_no, eem.eem_error_text, ers.ers_name
order by sts.sts_name, eem.eem_error_no, ers.ers_name;
-- drop the temporary table
drop table my_tt purge;