B (false), depending EXPLAIN PLAN. no always is executed first.
C (false), ".o" is correlative
E (false) is possible multiple rows, an error more than row.
A and D is correct
AD; cannot be B, correlated subqueries are not executed before the parent (outer) query. Cannot be E, cannot set customer_name to multiple values for each row
BD,
A is incorrect only matching rows are updated, not all
C is invalid, statement correct structure
E is incorrect, in case multiple rows, error multiple rows in subquery
Actually i though in that way. But most likely customer table is PK. Orders table is FK. So it means the data that in the orders table also have in the customers table. And all rows will be updated.
most likely customer table is PK. Orders table is FK. So it means the data that in the orders table also have in the customers table. And all rows will be updated.
I think B is correct, subquery will execute for each row its right but also update will update for each raw after fulfilling the condition of subquery :)
Then how update will update each raw ? update will check its resources "subquery" is condition met ? yes ? then update after execute subquery and fully checking it.
The STATMENT update will execute first, then the action of updating will execute after the subquery. explain plan for
update ordersQ8 o
set customer_name =
(select cust_last_name
from customersQ8
where customer_id = o.customer_id);
SELECT plan_table_output
FROM TABLE(DBMS_XPLAN.DISPLAY('plan_table',null,'basic +note'));
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