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SQL: A Beginner s Guide
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18. What types of constraints can you define within an assertion CHECK constraints 19. You re creating a CHECK constraint on the NUMBER_IN_STOCK column. You want to limit the values that can be entered into the column to the range of 11 through 29. What should you use for the <search condition> clause of the constraint ( NUMBER_IN_STOCK BETWEEN 11 AND 29 )
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5: Creating SQL Views
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1. What are two advantages of using views You can define complex queries and store them within the view definition. That way, rather than having to recreate those queries every time you need them, you can instead invoke the view. You can also present information to users without providing them with more information than they need or information that they should not see. 2. What are the three types of stored tables supported by SQL Base tables, derived tables, and viewed tables (views) 3. What happens if you don t assign column names to a view The view columns inherit the names from the originating table. 4. How do you assign data types to view columns You don t assign data types to view columns. The view columns inherit their data types from their respective table columns. 5. In what circumstances must you provide the view column names in a view definition You must provide names if any columns are arrived at through some sort of operation that calculates the value to be inserted in the column, rather than the value coming directly from the table. You must also provide names if table column names are duplicated, which can happen when joining tables together. 6. You re creating a view named EMP_BIRTHDAYS. The view is based on the EMP_NAME column and the BIRTHDAY column of the EMPLOYEES table. The view column names will be the same as the table column names. What SQL code should you use to create the view You should use the following code: CREATE VIEW EMP_BIRTHDAYS AS SELECT EMP_NAME, BIRTHDAY FROM EMPLOYEES; 7. You re creating a view based on the COMPACT_DISCS table in the INVENTORY database. You want the view to include only those rows whose value in the LABEL_ID column is 546. What clause in addition to the SELECT clause and the FROM clause should be included in the SELECT statement for the view
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Appendix A:
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You should use the following WHERE clause: WHERE LABEL_ID = 546 8. You re creating a view that references the EMPLOYEE table and the JOB_TITLE table. The data in the two tables is matched together by the JOB_TITLE_ID column in each table. How should you write the WHERE clause in the view s SELECT statement You should write the following WHERE clause: WHERE EMPLOYEE.JOB_TITLE_ID = JOB_TITLE.JOB_TITLE_ID 9. You re creating a view that references the EMPLOYEE table and the JOB_TITLE table. The data in the two tables is matched together by the JOB_TITLE_ID column in each table. You want the view to display only those rows whose value in the JOB_TITLE_ID column of the JOB_TITLE table is 109. How should you write the WHERE clause in the view s SELECT statement You should write the following WHERE clause: WHERE EMPLOYEE.JOB_TITLE_ID = JOB_TITLE.JOB_TITLE_ID AND JOB_TITLE.JOB_TITLE_ID = 109 10. What is a query specification A query specification is an SQL expression that begins with the SELECT keyword and includes a number of elements that form that expression. 11. Which guidelines should you follow if you want to create an updatable view A. Data within the view cannot be summarized, grouped together, or automatically eliminated. B. At least one column in the source table must be updatable. C. Each column in the view must be traceable to exactly one source column in one table. D. Each row in the view must be traceable to exactly one source row in one table. A, B, C, and D are correct. A view must adhere to all four guidelines to be updatable. 12. You create the following view based on the COMPACT_DISCS table in the INVENTORY database: CREATE VIEW IN_STOCK_AVERAGE AS SELECT AVG(IN_STOCK) FROM COMPACT_DISCS; How do you insert data through this view You can t insert data through this view because the data is being summarized (by using the AVG function), which means that the row in the view isn t traceable to exactly one source row in one table. 13. What type of view does the WITH CHECK OPTION clause apply to The WITH CHECK OPTION clause applies to updatable views that include a WHERE clause in the SELECT statement.
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