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By default, the output of a UNION ALL compound query is not sorted at all: the rows will be returned in groups in the order of which query was listed first and within the groups in the order that they happen to be stored The output of any other set operator will be sorted in ascending order of all the columns, starting with the first column named It is not syntactically possible to use an ORDER BY clause in the individual queries that make up a compound query This is because the execution of most compound queries has to sort the rows, which would conflict with the ORDER BY There is no problem with placing an ORDER BY clause at the end of the compound query, however This will sort the entire output of the compound query The default sorting of rows is based on all the columns in the sequence they appear A specified ORDER BY clause has no restrictions: it can be based on any columns (and functions applied to columns) in any order For example:

To select only the eagle s head without the background using multiple selection tools, first open Eaglepsd from the Samples folder within the Adobe Photoshop 7 folder on your computer Then, use the Marquee tool to draw a rectangle around the eagle s head, as shown in Figure 5-4 Then, click the Magic Wand tool from the toolbox and position it over the green background within your existing selection Hold down the ALT key (Windows) or OPTION key (Mac) and click the green background to remove that background from the existing selection, as shown in Figure 5-5

select deptno,trim(dname) name from old_dept union select dept_id,dname from new_dept order by name; DEPTNO NAME ---------- -------------------10 Accounts 30 Admin 20 Support SQL> 2 3 4

Note that the column names in the ORDER BY clause must be the name(s) (or, in this case, the alias) of the columns in the first query of the compound query

Figure 5-4

A subquery is a SELECT statement embedded within another SQL statement Subqueries can be nested within each other With the exception of the correlated subquery, subqueries are executed once, before the outer query within which they are embedded

Selecting rows from a table with a condition that depends on the data from another query can be implemented with a subquery Complex joins can sometimes be replaced with subqueries Subqueries can add values to the outer query s output that are not available in the tables the outer query addresses

Pardonnez-moi, Madame/ Monsieur/Mademoiselle par-don-nay mwa ma-dam/ meuh-syeuh/mad-mwa-zel Pardonnez-moi, madame O sont les toilettes par-don-nay mwa ma-dam oo soh lay twa-let Pardonnez-moi, mais je ne suis pas d accord par-don-nay mwa may zheuh neuh swee pa da-kor a ne pardonne pas sa neuh par-don pa There s no excuse Pardon me, but I disagree Pardon me, Madam Where are the restrooms Pardon me, Madam/Sir/Miss

Multiple-row subqueries can return several rows, possibly with several columns Single-row subqueries return one row, possibly with several columns A scalar subquery returns a single value; it is a single-row, single-column subquery A correlated subquery is executed once for every row in the outer query

Figure 5-5

Single-row subqueries should be used with single-row comparison operators Multiple-row subqueries should be used with multiple-row comparison operators The ALL and ANY operators can be alternatives to use of aggregations

UNION ALL concatenates the results of two queries UNION sorts the results of two queries and removes duplicates INTERSECT returns only the rows common to the result of two queries MINUS returns the rows from the first query that do not exist in the second query

The queries in the compound query must return the same number of columns The corresponding columns must be of compatible data types The set operators have equal precedence and will be applied in the order they are specified

If you have trouble removing all of the green background at once, undo your operation (Edit | Undo) and make sure your Tolerance is set to 32 in the Options bar at the top of the screen for the Magic Wand tool To make the edges of your selection smooth, place a check mark in the box next to Anti-aliased

It is not possible to use ORDER BY in the individual queries that make a compound query An ORDER BY clause can be appended to the end of a compound query The rows returned by a UNION ALL will be in the order they occur in the two source queries The rows returned by a UNION will be sorted across all their columns, left to right

1 Consider this generic description of a SELECT statement:

SELECT select_list FROM table WHERE condition GROUP BY expression_1 HAVING expression_2 ORDER BY expression_3 ;