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Working with Functions and Value Expressions
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8. The next value expression you ll try is the CASE expression. The statement will provide
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updated IN_STOCK values in the TO_ORDER column of the query results. For IN_STOCK values less than 10, the values will be doubled. For IN_STOCK values that fall within the range of 10 through 15, 3 will be added to the values. All other IN_STOCK values will remain the same. The statement operates only on those rows whose original IN_STOCK value is less than 20. Enter and execute the following SQL statement:
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SELECT CD_TITLE, IN_STOCK, TO_ORDER = CASE WHEN IN_STOCK < 10 THEN IN_STOCK * 2 WHEN IN_STOCK BETWEEN 10 AND 15 THEN IN_STOCK + 3 ELSE IN_STOCK END FROM COMPACT_DISCS WHERE IN_STOCK < 20;
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Your query results should include only seven rows, and the TO_ORDER column of the query results should contain the updated values.
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9. Now you will try the CAST value expression. You will query the MUSIC_TYPES table
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but will convert the data type of the TYPE_NAME column in your query results. Enter and execute the following SQL statement:
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SELECT TYPE_ID, CAST(TYPE_NAME AS CHAR(20)) AS CHAR_TYPE FROM MUSIC_TYPES;
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Your query should return 11 rows. The query results should include a CHAR_TYPE column that contains the converted values.
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10. Close the client application.
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Try This Summary
You should now be fairly comfortable with the various functions and value expressions that we reviewed in this chapter. Remember that each SQL implementation supports different functions and value expressions, usually many more than what you have seen here. In fact, in many cases, the functions and value expressions you saw in this chapter represent only the tip of the iceberg. Be sure to review your product documentation to find out what functions and value expressions are supported and how they re implemented. You ll find them useful tools in a variety of situations and well worth the effort you invest now.
SQL: A Beginner s Guide
10 Self Test
1. What is a set function 2. You re creating a SELECT statement that queries the ARTIST_CDS table. The table
includes the ARTIST_NAME and CD_NAME columns. You want your statement to return the total number of rows in the table. Which COUNT function should you include in your SELECT clause
A COUNT(*) B COUNT(ARTIST_NAME) C COUNT(CD_NAME) D COUNT(ARTIST_NAME, CD_NAME) 3. Which set function should you use to add together the values in a column A MAX B COUNT C SUM D AVG 4. Set functions require that the data be ____________ in some way. 5. What are value functions 6. You re using the SUBSTRING function to extract characters from the COMPACT_DISC
column of the SALES_DATES table. You want to start with the third character and extract eight characters. What parameters should you use in the SUBSTRING function
7. You re using the LOWER function on the Past Light value of the CD_NAME column. What
value will be returned
8. Which function returns a value that represents the current date and time as well as information
related to UCT
A LOCALTIMESTAMP B CURRENT_DATE C LOCALTIME D CURRENT_TIMESTAMP 9. What are four types of operators that you use in a numeric value expression 10. You are querying data from the CD_TRACKING table. You want to add values in
the IN_STOCK column to values in the ON_ORDER column. You then want to double the column totals. How do you set up the numeric value expression
10:
Working with Functions and Value Expressions
11. Which value expression do you use to set up a series of conditions that modify values 12. You re creating a SELECT statement that includes a CASE value expression. You want
one of the conditions to specify that any ON_ORDER values greater than 10 should be increased by 5. How should you set up the WHEN/THEN clause
13. What is the last word in a CASE value expression 14. What is a CAST value expression 15. You re querying the DATE_SOLD column in the SALES_DATES table. You want to convert
the values to a CHAR (25) data type, and you want the data displayed in the CHAR_DATE column in the query results. How do you define the CAST value expression
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