Simply question: Are these two query same?

Question

Question 1:
There is this query from someone: (I'm not sure how Join ON works)
SELECT NULL AS order_id
,line_id
,o.item_id
,o.customer_id
INTO v_line_table
FROM xx_items_v i,
JOIN order_dtl o ON i.item_id = o.item_id
WHERE o.que_id = 3380;
Is this same as below?
SELECT ORDER_ID , line_id , o.item_id, o.customer_id
into v_line_table
FROM xx_items_v i, order_dtl o
where i.item_id = o.item_id (+)
and o.que_id = 3380;
Question 2:
I want to retrieve ORDER_ID information from a 3rd table (order_header.order_id). The key between order_dtl & order_header are que_id. How can I add to the first query above?

Answer 1

No. Your first query will never work it has a comma between the first table and the join key word remove it then...
remove the (+) from you second piece of code and it will be the same as the amended first piece of code, or turn the upper piece of code into an outer join by specifying whether it is a left or a right outer join.
In your case it's a left join:
select [column list]
from table1 i
left join table2 o on i.key = o.key
where o.column = 1234;However, the where clause turns this query back into an inner join becuase the right side of the join must exist. You can either allow o.column to be null in the where clause, or move the predicate up into the join. The two folowing queries are equivalent in their results:
select [column list]
from table1 i
left join table2 o on i.key = o.key
where o.column = 1234
or o.column is null;
select [column list]
from table1 i
left join table2 o on i.key = o.key and o.column = 1234;Message was edited by:
Sentinel