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There are many occasions where you want to take a set of data (the source) and integrate it into an existing table (the target) If a row in the source data already exists in the target table, you may want to update the target row, or you may want to replace it completely, or you may want to leave the target row unchanged If a row in the source does not exist in the target, you will want to insert it The MERGE command lets you do this A MERGE passes through the source data, for each row attempting to locate a matching row in the target If no match is found, a row can be inserted; if a match is

found, the matching row can be updated The release 10g enhancement means that the target row can even be deleted, after being matched and updated The end result is a target table into which the data in the source has been merged A MERGE operation does nothing that could not be done with INSERT, UPDATE, and DELETE statements but with one pass through the source data, it can do all three Alternative code without a MERGE would require three passes through the data, one for each command The source data for a MERGE statement can be a table or any subquery The condition used for finding matching rows in the target is similar to a WHERE clause The clauses that update or insert rows are as complex as an UPDATE or an INSERT command It follows that MERGE is the most complicated of the DML commands, which is not unreasonable, as it is (arguably) the most powerful Use of MERGE is not on the OCP syllabus, but for completeness here is a simple example:

Photoshop has the ability to manage color information within each file it saves, by tagging it with a color profile In Photoshop, a color profile tells how to translate color numbers from one color space to another For example, a designer working on a magazine ad might use a color profile to ensure the colors in the file are geared toward the printing specifications of a certain printer

merge into employees e using new_employees n on (eemployee_id = nemployee_id) when matched then update set esalary=nsalary when not matched then insert (employee_id,last_name,salary) values (nemployee_id,nlast_name,nsalary);

The preceding statement uses the contents of a table NEW_EMPLOYEES to update or insert rows in EMPLOYEES The situation could be that EMPLOYEES is a table of all staff, and NEW_EMPLOYEES is a table with rows for new staff and for salary changes for existing staff The command will pass through NEW_EMPLOYEES and, for each row, attempt to find a row in EMPLOYEES with the same EMPLOYEE_ID If there is a row found, its SALARY column will be updated with the value of the row in NEW_ EMPLOYEES If there is not such a row, one will be inserted Variations on the syntax allow the use of a subquery to select the source rows, and it is even possible to delete matching rows

Commands can fail for many reasons, including the following: Syntax errors References to nonexistent objects or columns Access permissions Constraint violations Space issues Figure 8-3 shows several attempted executions of a statement with SQL*Plus

Color management is recommended if you anticipate reusing color graphics for print and online media, if you manage multiple workstations, or if you plan to print to different domestic and international presses If you decide to use color management, consult with your production partners such as graphic artists and prepress service providers to ensure that all aspects of your color management workflow integrate seamlessly with theirs

Figure 8-3

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To make it easier, Photoshop has automated the process of selecting the appropriate color settings To adjust the color settings specifically for web files (as shown in Figure 2-7), follow these steps: 1 Choose Edit | Color Settings 2 In the Settings box, select US Prepress Defaults