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you would have available if you doubled the amount you had on order for those CDs where there are fewer than 15 available:
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SELECT CD_NAME, IN_STOCK, ON_ORDER, (IN_STOCK + ON_ORDER) AS TOTAL, (IN_STOCK + ON_ORDER * 2) AS DOUBLE_ORDER FROM CD_TRACKING WHERE (IN_STOCK + ON_ORDER) < 15
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The second numeric value expression in this statement multiplies the ON_ORDER value by 2, adds it to the IN_STOCK value, and inserts the total into the DOUBLE_ORDER column of the query results, as shown in the following results:
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CD_NAME ------------------------Past Light Out of Africa Leonard Cohen The Best Of IN_STOCK -------6 8 6 ON_ORDER -------7 5 8 TOTAL ----13 13 14 DOUBLE_ORDER -----------20 18 22
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The query results include only three rows that meet the condition of the WHERE clause. For each of these rows, the IN_STOCK and ON_ORDER columns are calculated to provide you with data that can be useful to you, depending on your needs. The nice part is that these values do not have to be stored in the database. Instead, they re calculated when you execute the SELECT statement, rather than having to maintain tables with additional data.
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A CASE value expression allows you to set up a series of conditions that modify specified values returned by your SQL statement. You can change the way a value is represented or calculate a new value. Each value is modified according to the condition specified within the CASE expression. A CASE value expression includes the CASE keyword and a list of conditions. The last condition provides a default condition if none of the previous conditions have been met. The value expression is then closed by using the END keyword. Let s take a look at an example to give you a better idea of how this works. Suppose you want to increase the number of CDs you have on order, but you want to increase the amount for only certain CDs. In addition, you want to base how many CDs you add to the order on the current amount. Before you actually update the table, you can look at what the new values would be by creating a SELECT statement that queries the CD_TRACKING table, as shown in the following example:
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SELECT CASE WHEN WHEN ELSE END FROM WHERE CD_NAME, ON_ORDER, NEW_ORDERS =
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ON_ORDER < 6 THEN ON_ORDER + 4 ON_ORDER BETWEEN 6 AND 8 THEN ON_ORDER + 2 ON_ORDER CD_TRACKING ON_ORDER < 11;
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SQL: A Beginner s Guide
In this statement, three columns are specified: CD_NAME, ON_ORDER, and NEW_ ORDERS. The NEW_ORDERS column is the column created for the query results. It will contain the values updated by the CASE value expression. The expression itself is made up of the column name (NEW_ORDERS), the equals sign, the CASE keyword, two WHEN/THEN clauses, one ELSE clause, and the END keyword. Each WHEN/THEN clause represents one of the conditions. For example, the first clause specifies that if the ON_ORDER value is less than 6, then 4 should be added to the value. The second WHEN/THEN clause specifies that if the ON_ORDER value falls within the range of 6 though 8, then 2 should be added to the value. After the WHEN/THEN clauses, the ELSE clause specifies the final condition. If the value does not meet the conditions defined in the WHEN/THEN clauses, the ELSE clause specifies a default condition. In the case of the preceding SELECT statement, the ELSE clause merely refers to the ON_ORDER column, without specifying any modifications. (It would be the same as saying ON_ORDER + 0.) In other words, if none of the WHEN/THEN conditions are met, the ON_ORDER value stays the same. If you were to execute the SELECT statement, you would receive the following results:
CD_NAME ------------------------Past Light Out of Africa Leonard Cohen The Best Of Fundamental Blues on the Bayou ON_ORDER -------7 5 8 6 10 NEW_ORDERS ---------9 9 10 8 10
As you can see, the Out of Africa row is increased by 4, the Blues on the Bayou row is not increased at all, and the other three rows are increased by 2. In addition to modifying values, you can use a CASE value expression to rename values. This is particularly useful if your query results include values that are not easily recognizable. For example, suppose you want to create a query that returns data from the CD_CATEGORY column of the CD_TRACKING table. You can rename the values in the column so that the information returned is more understandable to users, as shown in the following SELECT statement:
SELECT CASE WHEN WHEN WHEN WHEN WHEN WHEN WHEN ELSE END FROM CD_NAME, CD_CATEGORY = CD_CATEGORY CD_CATEGORY CD_CATEGORY CD_CATEGORY CD_CATEGORY CD_CATEGORY CD_CATEGORY NULL CD_TRACKING; = = = = = = = 'FROK' 'CPOP' 'NEWA' 'XMAS' 'CTRY' 'STRK' 'BLUS' THEN THEN THEN THEN THEN THEN THEN 'Folk Rock' 'Classic Pop' 'New Age' 'Christmas' 'Country' 'Soundtrack' 'Blues'
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