Updating multiple tables in mssql


18-Mar-2017 04:33

updating multiple tables in mssql-41

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Views are saved SELECT statements that allow you to operate on the results that are returned from them.

They can be used to provide row- or column-level access to data, to wrap up complex joins, to perform complex aggregate queries, and to otherwise customize the display of data. In this chapter, learn how to define, create, and modify views, and how to perform index analysis and optimize performance in SQL Server. The biggest problem is that just when you get used to accepting a limitation, Microsoft comes up with an amazing, new feature that overcomes it!

This simplifies access to the data because the underlying query does not have to be written on the client and then submitted each time a report is run. Although you can set column-level security in SQL Server, it is tricky to maintain because it's pretty well buried in the table properties.

You may already have discovered that you can often greatly speed up Access reports by first saving the results of a complex record source query into a temporary table and then basing the report on that table rather than on the query. Row-level security must be defined at runtime because it's impossible to know what values a table will contain until then.

Using a view to filter data on the server is much more efficient than fetching an entire table and then applying a filter on the client. One reason it's recommended that the dbo own all objects in a database is that problems arise when the chain of ownership is broken.

After each exercise, we provide the solution so you can check your answer.

Views still, however, don't allow you to perform any of the other major SQL actions besides selecting—views can't contain syntax when defining a view.