Updating sql view
Updating sql view - top pakistani dating sites
The purpose of the WITH CHECK OPTION is to ensure that all UPDATE and INSERTs satisfy the condition(s) in the view definition.If they do not satisfy the condition(s), the UPDATE or INSERT returns an error.
Now, try to query the base table and the SELECT statement would produce the following result.The query in Listing 1 joins five tables to get information such as the client name, the order number and date, the products and quantities ordered.Listing 1 Notice that we use two-part naming for all tables.They're great in certain circumstances but they represent a trade-off, and they come with considerable 'small print'. SQL Server views are helpful in many ways, for example in encapsulating complex multi-table query logic, allowing us to simplify client code.Views make queries faster to write, but they don’t improve the underlying query performance.A view can contain all rows of a table or select rows from a table.
A view can be created from one or many tables which depends on the written SQL query to create a view.
If you omit the WHERE clause, all records in the table will be updated!
The WHERE clause specifies which record(s) that should be updated.
To make it easier for our application to consume this data, we can create a view Listing 2 creates a view based on our query definition, as shown in Listing 2. In order to make one of these changes, we would have to drop the view, change the table, and then recreate the view (and any indexes on the view).
Now, each application simply has to run a much simpler query referencing the view, as shown in Listing 3.
Indexed views can be a powerful tool, but they are not a ‘free lunch’ and we need to use them with care.