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As with Microsoft SQL Server and Sybase Adaptive Server, privileges are granted to the role using a standard GRANT statement. In the following examples, note how the same privileges can be granted to multiple roles when that ts the needs of the business, but at the same time, different privileges can be granted when required.

The ANSI/ISO SQL1 standard specifies the views that must be updateable in a database that claims conformance to the standard. Under the standard, a view can be updated if the query that defines the view meets all of these restrictions: I DISTINCT must not be specified; that is, duplicate rows must not be eliminated from the query results. I The FROM clause must specify only one updateable table; that is, the view must have a single source table for which the user has the required privileges. If the source table is itself a view, then that view must meet these criteria. I Each select item must be a simple column reference; the select list cannot contain expressions, calculated columns, or column functions. I The WHERE clause must not include a subquery; only simple row-by-row search conditions may appear. I The query must not include a GROUP BY or a HAVING clause. The basic concept behind the restrictions is easier to remember than the rules themselves. For a view to be updateable, the DBMS must be able to trace any row of the view back to its source row in the source table. Similarly, the DBMS must be able to trace each individual column to be updated back to its source column in the source table.

14:

If the view meets this test, then it s possible to define meaningful INSERT, DELETE, and UPDATE operations for the view in terms of the source table(s).

The SQL1 standard rules on view updates are very restrictive. Many views can be theoretically updated but do not satisfy all of the restrictions. In addition, some views can support some of the update operations but not others, and some views can support updates on certain columns but not others. Most commercial SQL implementations have view update rules that are considerably more permissive than the SQL1 standard. For example, consider this view: Create a view showing the sales, quota, and the difference between the two for each salesperson.

GRANT TO GRANT TO GRANT TO SELECT ON MPAA_RATING manager, clerk; SELECT ON MOVIE clerk; SELECT, INSERT, UPDATE, DELETE ON MOVIE manager;

CREATE VIEW SALESPERF (EMPL_NUM, SALES, QUOTA, DIFF) AS SELECT EMPL_NUM, SALES, QUOTA, (SALES - QUOTA) FROM SALESREPS

The SQL1 standard disallows all updates to this view because its fourth column is a calculated column. However, note that each row in the view can be traced back to a single row in the source table (SALESREPS). For this reason, DB2 (and several other commercial SQL implementations) allows DELETE operations against this view. Further, DB2 allows UPDATE operations on the EMPL_NUM, SALES, and QUOTA columns because they are directly derived from the source table. Only the DIFF column cannot be updated. DB2 does not allow the INSERT statement for the view because inserting a value for the DIFF column would be meaningless. The specific rules that determine whether a view can be updated vary from one brand of DBMS to another, and they are usually fairly detailed. Some views, such as those based on grouped queries, cannot be updated by any DBMS because the update operations simply do not make sense. Other views may be updateable in one brand of DBMS, partially updateable in another brand, and not updateable in a third brand. The SQL2 standard recognized this and includes a broader definition of updateable views along with considerable latitude for variation among DBMS brands. The best way to find out about updateability of views in your particular DBMS is to consult the user s guide or experiment with different types of views.

Checking View Updates (CHECK OPTION)

You probably never thought that you would hear an environmentalist saying that fossil fuels are a form of solar energy well think again! Fossil fuels are in fact produced from the clean energy of the sun at the end of the day, all they are is compressed plant matter which over millions of years has turned into oil, gas, and coal and herein lies the problem. It took millions of years for these to form, and they are soon exhausted if we burn them at their present rate. So yes, they are a result of solar energy, but we must use them with care!