Oracle when matched delete

In Oracle 9i only the INSERT and UPDATE parts were supporte in Oracle 10g DELETE was added. The merge_update_clause and merge_insert_clause became optional. The basic syntax for the MERGE statement: DELETE can only occur in the merge_update_clause of the above schema.

This means that it must occur in the WHEN MATCHED THEN clause. The additional DELETE WHERE clause will delete only those rows that were matched , already in the destination table, and meet the criteria of the DELETE WHERE clause. MERGE INTO destination d USING source s ON (s.id = d.id) WHEN MATCHED THEN UPDATE SET d. In Oracle 10g Release the MERGE statement gained the ability to delete rows, as well as update and insert them. This Oracle tip shows you how it works.

The MERGE statement, introduced in Oracle. I recommend following up on the MERGE syntax. Hi, I want to implement a loading situation like this: When there is match, delete all matched records, then insert the new record into the table. But it ended up delete all records in the table and insert the new records, instead of just delete the matched. Is there a way to use oracle merge to insert and delete but not update?

I have a table representing a set of values related to a single row in another table. Any delete triggers defined on the target table will be activated for each row deletion. You can specify this clause by itself or with the merge_insert_clause. If you specify both, then they can be in either order.

Statement Level triggers: Insert, Update, Delete. The DELETE clause of the MERGE statement will only ever act on records that were MATCHED and updated. Как раз 10G Но when matched then update set. The Oracle DELETE statement is used to delete a single record or multiple records from a table in Oracle. You can add an optional DELETE WHERE clause to the MATCHED clause to clean up after a merge operation.

To execute the MERGE statement, you must have the INSERT and UPDATE object privileges on the source tables. MERGE kann jedoch ab Oracle10g noch mehr. So sollen die Zeilen der DEPTNO nicht mehr in die Zieltabelle gemischt werden.

Say you would like to take transformed data and use it to update our dimension table. To read more about how updates work in Oracle, look at Tom Kyte’s Write Consistency Part I, Part II, Seeing a Restart, and Part III, Why is a Restart Important to Us. But that’s a tangent to the subject of this post. What I’ll show here is that you can run a DELETE and an INSERT as parts of the same statement.

Is this possible with a single statement (eg with the merge statement)? After the statement is executed sales_history table will look like this. Możemy wykonać tylko jedno polecenie DELETE, jedno polecenie UPDATE i jedno polecenie INSERT. Kiedy używamy klauzury MATCH z pewnym warunkiem wśród innych poleceń musi być ona użyta jako pierwsza.

Przykładowo polecenie “NOT MATCHED” nie mogło być pierwszym poleceniem w tym zapytaniu. Oracle Magazine Subscriptions and Oracle White Papers. Note: Primarily of value when moving large amounts of data in data warehouse. D) Oracle DELETE – delete cascade.

In practice, you often delete a row from a table which has a foreign key relationship with rows from other tables. For example, you want to delete the sales order with id from the orders table and also delete all the line items associated with the order id from the order_items table. JavaCoderWolf：merge into PERSONCERTIFICATEBAK b using (select ids from person_cer_dele ) u on (b.id = u.ids) when matched then update set b. SELECT ColColFROM tblSource. Some databases have their own specific DELETE syntax. Does oracle generate redo for updates that return rows and for insert that fail due to constraint?

Is merge statement efficient enough in order to consider starting to use it and fool it by inserting data into global temporary table and calling merge?