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Read or Download Oracle Real Application Clusters Guard Administration and Reference Guide (Part No A88810-02) (Release 9 0 1) (2001) PDF
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Extra info for Oracle Real Application Clusters Guard Administration and Reference Guide (Part No A88810-02) (Release 9 0 1) (2001)
Creating a View • Create a view, EMPVU80, that contains details of employees in department 80. CREATE VIEW empvu80 AS SELECT employee_id, last_name, salary FROM employees WHERE department_id = 80; View created. • Describe the structure of the view by using the iSQL*Plus DESCRIBE command. DESCRIBE empvu80 11-8 Copyright © Oracle Corporation, 2001. All rights reserved. Creating a View (continued) The example in the slide creates a view that contains the employee number, last name, and salary for each employee in department 80.
What are the ten worst selling products ? • Both largest values and smallest values sets are considered top-n queries. 11-22 Copyright © Oracle Corporation, 2001. All rights reserved. Top-n Analysis Top-n queries are useful in scenarios where the need is to display only the n top-most or the n bottommost records from a table based on a condition. This result set can be used for further analysis. For example using top-n analysis you can perform the following types of queries: • The top three earners in the company • The four most recent recruits in the company • The top two sales representatives who have sold the maximum number of products • The top three products that have had the maximum sales in the last six months Introduction to Oracle9i: SQL 11-22 Performing Top-n Analysis The high-level structure of a top-n analysis query is: SELECT [column_list], ROWNUM FROM (SELECT [column_list] FROM table ORDER BY Top-N_column) WHERE ROWNUM <= N; Copyright © Oracle Corporation, 2001.
You can use the OR REPLACE option to change the definition of the view without dropping and recreating it or regranting object privileges previously granted on it. Introduction to Oracle9i: SQL 11-8 Creating a View • Create a view by using column aliases in the subquery. CREATE VIEW salvu50 AS SELECT employee_id ID_NUMBER, last_name NAME, salary*12 ANN_SALARY FROM employees WHERE department_id = 50; View created. • 11-9 Select the columns from this view by the given alias names. Copyright © Oracle Corporation, 2001.