1. Views
CIS-182

2. Views
• Similar to an Access query
– Predefined SELECT statement
– At most basic level specifies which columns and rows
to return
• Provides a “virtual table”
– Reference in same way as a table:
SELECT * FROM Customers_V

3. Reducing Complexity
• Provide access to data from multiple tables
– Normalization doesn’t get in the way
• Limit number of columns returned
– Instead of returning all columns just return ones
commonly used

4. Ease of Use
• Can provide access to current information
– List only students who are currently enrolled in a
course
• Can organize data for common reports
– List students with assignments for a section

5. Hiding Data
• Provide only columns that are appropriate
• Provide only rows that are appropriate
• Can have multiple views on one table with
different fields and criteria for different user
groups
• Can also hide table organization

6. Syntax
CREATE VIEW viewname <column list>
<options>
AS
SELECT statement