Pl sql updating current record in cursor
clause; columns not explicitly modified retain their previous values.There are two ways to modify a table using information contained in other tables in the database: using sub-selects, or specifying additional tables in the you should ensure that the join produces at most one output row for each row to be modified.
They must be created when you are executing a SELECT statement that returns more than one row.In other words, a target row shouldn't join to more than one row from the other table(s).If it does, then only one of the join rows will be used to update the target row, but which one will be used is not readily predictable.The set of rows the cursor holds is called the set.There are two types of cursors in PL/SQL: These are created by default when DML statements like, INSERT, UPDATE, and DELETE statements are executed.The table has Item id(id), year of ownership (year) , quarter of ownership(quarter), own by ctc status(ownby_ctc), and own by ftc status (ownby_ftc).
Each item id will be repeated one time each quarter every year from 2013 to 2016.
Both implicit and explicit cursors have the same functionality, but they differ in the way they are accessed.
When you execute DML statements like DELETE, INSERT, UPDATE and SELECT statements, implicit statements are created to process these statements.
If the item already exists, instead update the stock count of the existing item.
To do this without failing the entire transaction, use savepoints: BEGIN; -- other operations SAVEPOINT sp1; INSERT INTO wines VALUES('Chateau Lafite 2003', '24'); -- Assume the above fails because of a unique key violation, -- so now we issue these commands: ROLLBACK TO sp1; UPDATE wines SET stock = stock 24 WHERE winename = 'Chateau Lafite 2003'; -- continue with other operations, and eventually COMMIT; If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.
ownby_ctc will be marked 1 if item owned by CTC and it is either: 1- Happened before ownby_ftc or 2- Happened in the same quarter as ownby_ftc and ownby_ctc never happened after ownby_ftc. Problem with my code is that the function is updating one row if the condition is true and this is because I am updating the actual table but not the cursor.