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CITY -----------New York Los Angeles Atlanta Chicago Denver
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REGION (SALES-TARGET) -------- --------------Eastern $117,637.00 Western $110,915.00 Eastern $17,911.00 Eastern $64,958.00 Western $113,958.00
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These query results are sorted on the third column, which is the calculated difference between the SALES and TARGET for each office. By combining column numbers, column names, ascending sorts, and descending sorts, you can specify quite complex sorting of the query results, as in the following final example: List the offices, sorted in alphabetical order by region, and within each region in descending order by sales performance.
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SELECT CITY, REGION, (SALES - TARGET) FROM OFFICES ORDER BY REGION ASC, 3 DESC; CITY -----------New York Atlanta Chicago Los Angeles Denver REGION (SALES-TARGET) -------- --------------Eastern $117,637.00 Eastern $17,911.00 Eastern $64,958.00 Western $110,915.00 Western $113,958.00
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The SQL standard allows you to control the sorting order of the individual characters within a character set, often called the collating sequence of the characters. This can be important when working with international character sets (for example, to specify how diacritical marks such as accents or umlauts or compound letters should be sorted) or to ensure portability between ASCII and EBCDIC character set systems. However, this area of the SQL standard is quite complex, and in practice, many SQL implementations either ignore sorting sequence issues, or use their own proprietary scheme for user control of the sorting sequence.
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Rules for Single-Table Query Processing
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Single-table queries are generally simple, and it s usually easy to understand the meaning of a query just by reading the SELECT statement. As queries become more complex, however, it s important to have a more precise definition of the query results that will be produced by a given SELECT statement. The following steps describe the procedure for generating the results of a SQL query that includes the clauses described in this chapter. As these steps show, the query results produced by a SELECT statement are specified by applying each of its clauses, one by one. The FROM clause is applied first (selecting the table or view containing data to be retrieved). The WHERE clause is applied next (selecting specific rows from the table). The SELECT clause is applied next (generating the specific columns of query results and eliminating duplicate rows, if requested). Finally, the ORDER BY clause is applied to sort the query results.
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Simple Queries
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To generate the query results for a single-table SELECT statement, follow these steps: 1. Start with the table named in the FROM clause. 2. If there is a WHERE clause, apply its search condition to each row of the table, retaining those rows for which the search condition is TRUE, and discarding those rows for which it is FALSE or NULL. 3. For each remaining row, calculate the value of each item in the select list to produce a single row of query results. For each column reference, use the value of the column in the current row. 4. If SELECT DISTINCT is specified, eliminate any duplicate rows of query results that were produced. 5. If there is an ORDER BY clause, sort the query results as specified. The rows generated by this procedure comprise the query results. These rules for SQL query processing will be expanded several times in the next three chapters to include the remaining clauses of the SELECT statement.
PART II
Combining Query Results (UNION)*
Occasionally, it s convenient to combine the results of two or more queries into a single table of query results. SQL supports this capability through the UNION feature of the SELECT statement. Figure 6-14 illustrates how to use the UNION operation to satisfy the following request. List all the products where the price of the product exceeds $2,000 or where more than $30,000 of the product has been ordered in a single order.
FIGURE 6-14
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