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A UNION ALL takes two result sets and concatenates them together into a single result set The result sets come from two queries that must select the same number of columns, and the corresponding columns of the two queries (in the order in which they are specified) must be of the same data type group The columns do not have to have the same names Figure 13-2 demonstrates a UNION ALL operation from two tables The UNION ALL of the two tables converts all the values to the higher level of precision: the dates are returned as timestamps (the less precise DATEs padded with zeros), the character data is the more efficient VARCHAR2 with the length of the longer input column, and the numbers (though this is not obvious due to the nature of the data) will accept decimals The order of the rows is the rows from the first table in whatever order they happen to be stored followed by the rows from the second table in whatever order they happen to be stored

EXAM TIP A UNION ALL will return rows grouped from each query in their natural order This behavior can be modified by placing a single ORDER BY clause at the end

Figure 5-3

A UNION performs a UNION ALL and then sorts the result across all the columns and removes duplicates The first query in Figure 13-3 returns all four rows because there are no duplicates However, the rows are now in order It may appear that the first two rows are not in order because of the values in DATED, but they are: the DNAME in the table OLD_DEPTS is 20 bytes long (padded with spaces), whereas the DNAME in NEW_DEPTS, where it is a VARCHAR2, is only as long as the name itself The spaces give the row from OLD_DEPT a higher sort value, even though the date value is less The second query in Figure 13-3 removes any leading or trailing spaces from the DNAME columns and chops off the time elements from DATED and STARTED Two of the rows thus become identical, and so only one appears in the output Because of the sort, the order of the queries in a UNION compound query makes no difference to the order of the rows returned TIP If, as a developer, you know that there can be no duplicates between two tables, then always use UNION ALL It saves the database from doing a lot of sortingYour DBA will not be pleased with you if you use UNION unnecessarily

The intersection of two sets is the rows that are common to both sets, as shown in Figure 13-4

After selecting the white background in the Duckytif file, I choose Select | Inverse to have Photoshop select the exact opposite of the white background

The first query shown in Figure 13-4 returns no rows, because every row in the two tables is different Next, applying functions to eliminate some of the differences returns the one common row In this case, only one row is returned; had there been several common rows, they would be in order The order in which the queries appear in the compound query has no effect on this

A MINUS runs both queries, sorts the results, and returns only the rows from the first result set that do not appear in the second result set The third query in Figure 13-4 returns all the rows in OLD_DEPT because there are no matching rows in NEW_DEPT The last query forces some commonality, causing one of the rows to be removed Because of the sort, the rows will be in order irrespective of the order in which the queries appear in the compound query

If two queries do not return the same number of columns, it may still be possible to run them in a compound query by generating additional columns with NULL values For example, consider a classification system for animals: all animals have a name and a weight, but the birds have a wingspan whereas the cats have a tail length A query to list all the birds and cats might be

Some things to keep in mind when using this process are the following: You can use any selection tools to make the initial selection, and are not restricted to using the Magic Wand tool When you do use the Magic Wand tool to make the initial selection, you may need to click the check box next to Contiguous in the options bar, if all the solid areas of color you want to select aren t touching The Inverse command selects the exact opposite of what is currently selected, so make sure all the pixels you don t want to include in your final selection are selected before choosing Select | Inverse

select name,tail_length,to_char(null) from cats union all select name,to_char(null),wing_span from birds;