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SELECT NAME, CITY, REGION FROM SALESREPS, OFFICES WHERE REP_OFFICE = OFFICE; NAME -------------Mary Jones Sam Clark Bob Smith Paul Cruz Dan Roberts Bill Adams Sue Smith Larry Fitch Nancy Angelli CITY -----------New York New York Chicago Chicago Chicago Atlanta Los Angeles Los Angeles Denver REGION -------Eastern Eastern Eastern Eastern Eastern Eastern Western Western Western

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The OFFICES (child) table contains MGR, a foreign key for the SALESREPS (parent) table. This relationship is used to find the correct SALESREPS row for each salesperson, so that the correct name and title of the manager can be included in the query results. SQL does not require that the matching columns be included in the results of a multitable query. They are often omitted in practice, as in the two preceding examples. That s because primary keys and foreign keys are often ID numbers (such as the office numbers and employee numbers in the examples), which humans find hard to remember, while the associated names (cities, regions, names, titles) are easier to understand. It s quite common for ID numbers to be used in the WHERE clause to join two tables, and for more descriptive names to be specified in the SELECT clause to generate columns of query results.

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The SALESREPS (child) table contains REP_OFFICE, a foreign key for the OFFICES (parent) table. This relationship is used to find the correct OFFICES row for each salesperson, so that the correct city and region can be included in the query results. Here s another query involving the same two tables, but with the parent and child roles reversed, as shown in Figure 7-4.

The search condition that specifies the matching columns in a multitable query can be combined with other search conditions to further restrict the contents of the query results. Suppose you want to rerun the preceding query, showing only offices with large sales targets:

Part II:

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The MIN() and MAX() column functions find the smallest and largest values in a column, respectively. The data in the column can contain numeric, string, or date/time information. The result of the MIN() or MAX() function has exactly the same data type as the data in the column. Here are some examples that show the use of these column functions: What are the smallest and largest assigned quotas SELECT MIN(QUOTA), MAX(QUOTA) FROM SALESREPS MIN(QUOTA) MAX(QUOTA) ------------ ----------$200,000.00 $350,000.00 What is the earliest order date in the database SELECT MIN(ORDER_DATE) FROM ORDERS MIN(ORDER_DATE) --------------04-JAN-89 What is the best sales performance of any salesperson SELECT MAX(100 * (SALES/QUOTA)) FROM SALESREPS MAX(100*(SALES/QUOTA)) ----------------------135.44 When the MIN() and MAX() column functions are applied to numeric data, SQL

OFFICE 22 11 12 13 21 CITY Denver New York Chicago Atlanta Los Angeles REGION MGR TARGET SALES $186,042.00 $692,637.00 $735,042.00 $367,911.00 $835,915.00 Western 108 $300,000.00 Eastern 106 $575,000.00 Eastern 104 $800,000.00 Eastern NULL $350,000.00 Western 108 $725,000.00

Multitable Queries (Joins)

105 109 102 106 104 101 110 108 103 107 Bill Adams Mary Jones Sue Smith Sam Clark Bob Smith Dan Roberts Tom Snyder Larry Fitch Paul Cruz Nancy Angelli

List the offices with a target over $600,000.

FIGURE 7-3

SELECT FROM WHERE AND CITY, NAME, TITLE OFFICES, SALESREPS MGR = EMPL_NUM TARGET > 600000.00 NAME -----------Bob Smith Larry Fitch TITLE ---------Sales Mgr Sales Mgr

SALESREPS Table EMPL_NUM NAME 105 109 102 106 104 101 110 108 103 107 Bill Adams Mary Jones Sue Smith Sam Clark Bob Smith Dan Roberts Tom Snyder Larry Fitch Paul Cruz Nancy Angelli

- 139 -

With the additional search condition, the rows that appear in the query results are further restricted. The first test (MGR=EMPL_NUM) selects only pairs of OFFICES and SALESREPS rows that have the proper parent/child relationship; the second test further selects only those pairs of rows where the office is above target.

TITLE Sales Rep Sales Rep Sales Rep VP Sales Sales Mgr Sales Rep Sales Rep Sales Mgr Sales Rep Sales Rep

The ORDERS table and the PRODUCTS table in the sample database are related by a composite foreign key/primary key pair. The MFR and PRODUCT columns of the ORDERS table together form a foreign key for the PRODUCTS table, matching its MFR_ID and PRODUCT_ID columns, respectively. To join the tables based on this parent/child relationship, you must specify both pairs of matching columns, as shown in this example: List all the orders, showing amounts and product descriptions.

Western 108 $300,000.00 Eastern 106 $575,000.00 Eastern 104 $800,000.00 Eastern NULL $350,000.00 Western 108 $725,000.00

FIGURE 7-4

SELECT FROM WHERE AND ORDER_NUM, AMOUNT, DESCRIPTION ORDERS, PRODUCTS MFR = MFR_ID PRODUCT = PRODUCT_ID

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