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One of the best ways to think about summary queries and column functions is to imagine the query processing broken down into two steps. First, you should imagine how the query would work without the column functions, producing many rows of detailed query results. Then you should imagine SQL applying the column functions to the detailed query results, producing a single summary row. For example, consider the following complex query: Find the average order amount, total order amount, average order amount as a percentage of the customer s credit limit, and average order amount as a percentage of the salesperson s quota.

SELECT AVG(AMOUNT), SUM(AMOUNT), (100 * AVG(AMOUNT/CREDIT_LIMIT)), (100 * AVG(AMOUNT/QUOTA)) FROM ORDERS, CUSTOMERS, SALESREPS WHERE CUST = CUST_NUM AND REP = EMPL_NUM AVG(AMOUNT) $8,256.37 SUM(AMOUNT) $247,691.00 (100*AVG(AMOUNT/CREDIT_LIMIT)) 24.45 (100*AVG(AMOUNT/QUOTA)) 2.51

------------ ------------ ------------------------------- ------------------------

SELECT ASCII('!');

Without the column functions, it would look like this:

SELECT FROM WHERE AND AMOUNT, AMOUNT, AMOUNT/CREDIT_LIMIT,AMOUNT/QUOTA ORDERS, CUSTOMERS, SALESREPS CUST = CUST_NUM AND REP = EMPL_NUM

efficient power source, communities will get zero emissions, and automakers will get another major business opportunity a growth opportunity. William C. Ford, Jr, Ford Chairman, International Auto Show, January 2000. Fuel cell vehicles will probably overtake gasoline-powered cars in the next 20 to 30 years. Takeo Fukui, Managing Director, Research and Development, Honda Motor Co., Bloomberg News, June 5, 1999.

and would produce one row of detailed query results for each order. The column functions use the columns of this detailed query results table to generate a single-row table of summary query results. A column function can appear in the select list anywhere that a column name can appear. It can, for example, be part of an expression that adds or subtracts the values of two column functions. However, the argument of a column function cannot contain another column function, because the resulting expression doesn t make sense. This rule is sometimes summarized as it s illegal to nest column functions. It s also illegal to mix column functions and ordinary column names in a select list, again because the resulting query doesn t make sense. For example, consider this query:

Figure 12-18.

N OTE Oracle requires a FROM clause on all SELECT statements, so the clause FROM DUAL must be added to the statement in order to run it in Oracle. 14. Oracle:

its lock unless Transaction C is operating at a very low (READ UNCOMMITTED) isolation level. The same is true of Transaction D. Only after Transaction B has committed its changes can Transactions C and D proceed. Comparing the operations in Figures 12-17 and 12-18, two differences are worth noting. First, and more fundamentally, the versioning approach in Figure 12-17 allows more concurrent transactions to proceed in parallel. The locking approach in Figure 12-18 will, under most circumstances, cause two or more transactions to wait for others to complete and free their locks. The second, and more subtle, difference is that the

effective order of serial transaction execution is different between the two figures. As noted, in Figure 12-17, the transaction sequence A-C-D-B-E produces the results. In Figure 12-18, the sequence A-B-C-D-E produces the results. Note that neither is correct; the serializability principle states only that the results produced by the DBMS must match some sequence of serial transactions. The example in Figure 12-17 includes only one updating transaction, so only two copies of the updated row are required (before and after the update). The versioning architecture is easily extended to support more concurrent updates. For each attempt to update the row, the DBMS can create another new row, reflecting the update. With this multiversioned approach, the task of keeping track of which transactions should see which version of the row obviously becomes more complex. In practice, the decision about which version of the row should be visible to each concurrent transaction depends not only on the sequence of database operations, but also on the isolation levels requested by each of the transactions. Versioning does not completely eliminate the possibility of deadlocks within the database. The two transactions in Figure 12-13, with their interleaved attempts to update two different tables, each in a different order, will still produce problems, even for a versioning scheme. However, for workloads with a mix of database READ operations and database UPDATE operations, versioning can significantly reduce the locking and lock timeouts or deadlocks associated with shared locks.

Versioning Advantages and Disadvantages *

SELECT CEIL(AVG(RETAIL_PRICE_DVD)) AS AVERAGE_DVD_PRICE FROM MOVIE;