ERROR in inserting values in table PL/SQL code

Question

Hello Friends,
I am facing a peculiar logical error in my PL/SQL code. PFB the code for your reference -
for k in (select account_no from mirror_lookup_accnt_hierarchy where mdate = sys_date) LOOP
dbms_output.put_line(' SYSDATE :!! '||sys_date||' '||k.account_no);
insert into sfdc_account select * from mirror_sfdc_account where sap_account_id__c=k.account_no;
commit;
end loop;
Just to elaborate on the code functionality......
The outer FOR loop on the table has the records in the order i want to populate in the final sfdc_account table.
Now, i compare the account_no of the table mirror_sfdc_account table with the account_no of the FOR LOOP and INSERT that record in the final sfdc_account table. So, it is entered according to the order i want to have.
The problem is, this code runs fine for the first time, but then on it does not popuate the values in the right order according to the FOR LOOP values.
I have tried deleting data and running again, but the error persists. It enters the records but NOT IN ORDER according to the condition i have given!!
Kindly Help.....what can be the problem!!
Thanks and Regards,

Answer 1

Hi friend,
The thing is that we need to populate the final
table based on a hierarchy,the relation between
parent and child fieldNo. The thing is.... that Oracle is a relational database. That means that the data is stored in a relational manner, not in an ordered manner, such as you get with COBOL and it's flat file format.
You CANNOT rely on the database to store data in an ordered manner.
If you require the data in some sort of order when you retrieve it then you MUST store information against the data which can be used to determine that order and you MUST specify an ORDER BY clause on your query that retrieves the data.
Internally Oracle will not maintain the order of the data for you automatically.
This is a simple truth.