Oracle forms updating a view
Safra Catz (Hebrew: צפרא כץ, born December 1, 1961) is an Israeli-born American business executive.
She has been an executive at Oracle Corporation since April 1999, and a board member since 2001.
SQL In the MERGE statement above, Jack, Caledon and Fabrizio’s records were not deleted from the table STUDENTS though their scores are below 640, since the delete condition works on the source, not the target. Interestingly, I have found it hard to get managers to agree to using it – they don’t like the sequence gaps and the fact that inserts and update counts aren’t reported individually. Hi, How do you know to know the id of the row that has been inserted OR updated? A workaround is to add a couple of tracking columns to the target table: transaction_type, transaction_date.
CREATE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Microsoft'; CREATE or REPLACE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Apple'; A VIEW in Oracle is created by joining one or more tables.
An updatable view is one which allows performing a UPDATE command on itself without affecting any other table. The view is defined based on one and only one table. The view must include the PRIMARY KEY of the table based upon which the view has been created. The view should not have any field made out of aggregate functions. The view must not have any DISTINCT clause in its definition. The view must not have any GROUP BY or HAVING clause in its definition. The view must not have any SUBQUERIES in its definitions. If the view you want to update is based upon another view, the later should be updatable. Any of the selected output fields (of the view) must not use constants, strings or value expressions.
Oracle’s MERGE statement is tailor-made for situations when you want to do an "upsert" i.e.
In April 2011 she was named co-president and chief financial officer, reporting to founder/CEO Larry Ellison. After the election of Donald Trump, Catz was one of several high-profile CEOs, including, among others, Tim Cook, Sheryl Sandberg and Jeff Bezos, invited to talk with the then president-elect about potentially taking up a position in the incoming administration.
Consider another table STUDENT_N, which holds updates for the target table STUDENT.
Although you don’t need to use them the first time that you create a view, including them will overwrite an older version of the view with your latest one, without giving you an error message.
• The syntax to remove a view from your schema is exactly what you would expect: A view name may be used in exactly the same way as a table name in any SELECT query.
Once stored, the view can be used again and again, rather than re-writing the same query many times.
The SQL UPDATE VIEW command can be used to modify the data of a view.