Inherited primary key - how to realize (INVOICE - ITEM_OF_INVOICE example)

Hi,
how to realize (=create) following. I have two tables, first table is 'INVOICE' (PK is column INVOICE_NO) and second table is 'ITEM_OF_INVOICE' (PK is columns INVOICE_NO [inherited from table 'INVOICE'] and 'ITEM_ID').
Table: INVOICE
PK: INVOICE_NO
INVOICE_NO | COL2 | COL3 | ... | COLN |
1000001 | ... | ... | ... | ... |
1000002 | ... | ... | ... | ... |
1000003 | ... | ... | ... | ... |
Table: ITEM_OF_INVOICE
PK: INVOICE_NO, ITEM_ID
INVOICE_NO | ITEM_ID | COL3 | ... | COLN |
10000001 | 1 | ... | ... | ... |
10000001 | 2 | ... | ... | ... |
10000001 | 3 | ... | ... | ... |
10000001 | ... | ... | ... | ... |
10000001 | n | ... | ... | ... |
10000002 | 1 | ... | ... | ... |
10000002 | 2 | ... | ... | ... |
10000002 | ... | ... | ... | ... |
10000002 | n | ... | ... | ... |
10000003 | 1 | ... | ... | ... |
10000003 | 2 | ... | ... | ... |
10000003 | ... | ... | ... | ... |
10000003 | n | ... | ... | ... |
To summarize
- I want to "inherit" INVOICE_NO from table 'INVOICE' to table 'ITEM_OF_INVOICE'
- I also want to start all ITEM_ID with 1 and increment with 1 for each item in each invoice, some kind of sequence I guess...
Pls, advice and tell me how to realize above.
Thx in advance!
Edited by: user8819407 on Feb 12, 2010 1:31 PM

Hi,
Whene inserting the data in the first table, using "returning into" clause, you can get the value to be inserted into the child table.
let us say the invoice has a sequence invoice_seq to generate unique invoice numbers...
declare
v_invoice_no number;
begin
Insert into INVOICE (invoice_no, col2, col3..) values (
invoice_seq.nextval, col2, col3....)
returning invoice_no into v_invoice_no;
---- You can use the v_invoice_no to make insert statements into the child table.
Insert into invoice_items
select v_invoice_num, invoice_item_seq.nextval,
col4, col5.... from temp ; ---How do you get teh records for items..?How do you get these records for the child table (for inserting). Do you take it from some temporary table..?
Unless it is done as a batch process, inserting using 1,2,3.... within a given invoice is kind of difficult for concurrency reasons. What if you have 1 and 2 items numbers for a given invoice and two concurrent sessions try to insert a third item..Should one of them error out..? Logically, it should not.
I would suggest you use a different seuqence for the item ID instead of assigning 1....n numbers for each item. You can always get the result you need by using the row_number analytic function.

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Message was edited by:
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Hi,
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When i creating the table,in this the following are the columns Name,Street,City,Pin in this they give some rules the column Name & City as Primary Key. But when type the query What do you mean by "But when type the query"?
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[/CODE]
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greetings
Freek D
I am new to Oracle and need to know how to create a table that uses an automatic incrementation on a primay key for it's default. I need the uniqueness automatically managed by the DBMS.. This activity is know as setting the Column (primary key with identity) in Ms-SQL..
Your help would be appreciated greatly....
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Inherited primary key - how to realize (INVOICE - ITEM_OF_INVOICE example)

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