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A time-stamped version of the policy dimension table is illustrated in Figure 8-3. The first block of attributes contains the usual dimension columns: a surrogate key, the natural key, and a set of dimension attributes. Four additional columns have been added: transaction_ type, effective_date, expiration_date, and most_recent_version. To the right of the table diagram, a grid illustrates the rows recorded in this table for policy 40111, which belongs to our old friend Hal Smith. The first row shows that Hal s policy went into effect on February 14, 2005. At the time, he was single. The policy remained in this state through February 11, 2006. On the next day, February 12, a policy change caused the next row to become effective. This row updated the policy to show that Hal married, with his family size increasing from one family member to two. The row shows that there was only one covered party, which means that Hal s spouse was not covered by the policy. Additional changes to the policy are reflected in the subsequent rows. Study the table closely, and you will see that the effective_date and expiration_date for each changed row line up closely; there are no gaps. The last row in the illustration shows the current status of Hal Smith s policy. Since it has not expired, the expiration_date is set to 12/31/9999. This date has been specifically designated for use when the policy has not expired. When we are querying the table, this value allows us to avoid the additional SQL syntax that would be necessitated if a NULL had been used.

This controller attaches to one source hard disk and one or more destination hard disks When the disk duplication operation is started, the controller copies all the data from the source hard disk to the destination hard disk(s) This ensures that all of the information is copied, bit by bit, from the source to other disks The end result is several hard disks with identical contents The drives can then be replaced in their original machines for use Although hardware disk duplicators can be faster than other methods, they can be quite costly Also, additional work is involved in removing and replacing hard disks from PCs Disk duplication can also be performed using various software tools These utilities are usually inexpensive and require no special hardware in order to operate Two examples are Symantec Software s Norton Ghost (wwwsymanteccom) and PowerQuest, Inc s Drive Image (wwwpowerquestcom).

In this new example, the subquery must produce "the overall average order size" for the salesperson whose row group is currently being tested by the HAVING clause. The subquery selects orders for that particular salesperson, using the outer reference EMPL_NUM. The outer reference is legal because EMPL_NUM has the same value in all rows of a group produced by the main query.

POLICY policy_key policy_number policy_holder marital_status family_size covered_parties spouse_coverage covered_children deductible_amount . . . transaction_type effective_date expiration_date most_recent_version

Both of these tools allow you to create an image of one or more partitions on your hard disk and store them in a single file You can then use the file to restore data to the same or other machines Utilities are also available for performing selective restores of just a few files The software utilities can be made extremely useful through the creation of a special network boot floppy a disk from which a machine can be booted and have access to the network Whenever a machine fails or becomes unbootable, a system administrator can boot the system with the floppy, connect to a network share, and then run the appropriate utilities to reload a default configuration to the machine Overall, disk duplication methods can be very useful in systems deployment and in PC backups If you haven t done so already, consider investing in disk duplication methods..

POLICY policy_ policy_ key number 12882 12911 13400 14779 14922 40111 40111 40111 40111 40111 policy_ holder Smith, Hal Smith, Hal Smith, Hal Smith, Hal Smith, Hal transaction_ type effective_ expiration_ date date 2/14/2005 2/11/2006 2/12/2006 3/30/2006 3/31/2006 12/19/2007 12/20/2007 2/3/2008 2/4/2008 12/31/9999 most_ recent_ version Expired Expired Expired Expired Current marital_ family_ covered_ parties status size Single Married Married Married Married 1 2 2 3 4 1 1 2 3 4

Figure 5-5.

- 178 -

SELECT policy_holder, marital_status . . . WHERE 12/31/2006 >= effective_date AND 12/31/2006 <= expiration_date

5:

This chapter has described subqueries, which allow you to use the results of one query to help define another query: A subquery is a "query within a query." Subqueries appear within one of the subquery search conditions in the WHERE or HAVING clause. When a subquery appears in the WHERE clause, the results of the subquery are used to select the individual rows that contribute data to the query results. When a subquery appears in the HAVING clause, the results of the subquery are used to select the row groups that contribute data to the query results. Subqueries can be nested within other subqueries. The subquery form of the comparison test uses one of the simple comparison operators to compare a test value to the single value returned by a subquery. The subquery form of the set membership test (IN) matches a test value to the set of values returned by a subquery. The existence test (EXISTS) checks whether a subquery returns any values. The quantified tests (ANY and ALL) use one of the simple comparison operators to compare a test value to all of the values returned by a subquery, checking to see whether the comparison holds for some or all of the values. A subquery may include an outer reference to a table in any of the queries that contain it, linking the subquery to the "current" row of that query.

SELECT policy_holder, marital_status . . . WHERE most_recent_row = "Current"