Updating sql view


24-Oct-2016 04:23

The name should be somewhat reflective of the purpose of the view. As you can see in our view we are formatting the first and last name.

You can clearly see that I did not do such a good job with this. This SELECT can include a WHERE clause or anything else for that matter that can be put into a SELECT statement. This is a pretty common thing to do, By having a view that already does this we save having to write that function in every query where this is a requirement.

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 = 'IBM'; 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 = 'Microsoft'; A VIEW in SQL is created by joining one or more tables.

When you update record(s) in a view, it updates the records in the underlying tables that make up the SQL View.

Views can make it easier to create lossless join decomposition.

Just as rows in a base table lack any defined ordering, rows available through a view do not appear with any default sorting.

There are also certain other constructs that make a view nonupdatable.

To be more specific, a view is not updatable if it contains any of the following: .

updating sql view-85

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Changes applied to the data in a relevant underlying table are reflected in the data shown in subsequent invocations of the view.

Although such a view is not insertable, it can be updatable if you update only columns that are not expressions.



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