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This command will only succeed if the user does not own any objects: if the schema is empty If you do not want to identify all the objects owned and drop them first, they can be dropped with the user by specifying CASCADE:

Photoshop saves colors added to the Swatches palette in the preferences for the program To permanently save the color, click the triangle in the upper corner of the palette and choose Save Swatches

drop user scott cascade;

To manage accounts with Database Control, from the database home page take the Schema tab and then the Users link in the Security section This will show all the user accounts in the database Figure 6-3 shows these, sorted in reverse order of creation To change the sort order, click the appropriate column header The first user in the figure is PUBLIC This is a notional user to whom privileges can be granted if you wish to grant them to every user The CREATE button will present a window that prompts for all the user account attributes The DELETE button will drop an account, with the CASCADE option if necessary but it will give an Are you sure prompt before proceeding To adjust the attributes of an account, select it and click EDIT This will take you to the Edit User window, shown in Figure 6-4 This interface can be used to change all

Figure 6-3

Perhaps you have negotiated with your printer to use a custom ink mix For example, you need to match a beige perfectly, and not one of the thousands of premixed inks out there seems to match, so you and your printer have come up with your own mix

In this example, the subquery (lines 3 and 4) will select every employee who is in a department whose name includes the string IT and increment their current salary by 10 percent (unlikely to happen in practice) It is also possible to use subqueries to determine the value to which a column will be set, as in the fourth example In this case, one employee (identified by primary key, in line 5) is transferred to department 80 (the sales department), and then the subquery in lines 3 and 4 sets his commission rate to whatever the lowest commission rate in the department happens to be The syntax of an update that uses subqueries is as follows:

UPDATE table SET column=[subquery] [,column=subquery] WHERE column = (subquery) [AND column=subquery] ;

There is a rigid restriction on the subqueries using update columns in the SET clause: the subquery must return a scalar value A scalar value is a single value of whatever data type is needed: the query must return one row, with one column If the query returns several values, the UPDATE will fail Consider these two examples:

Is your Swatches palette bogging you down Too many choices a bad thing Sometimes Cut it out literally If you hold down the OPTION key (Mac) or ALT key (Windows) while your cursor is over a specific color, a little scissors icon will pop up Click that color and away it goes You can eliminate as many colors as you want, and this works with any color palette

update employees set salary=(select salary from employees where employee_id=206); update employees set salary=(select salary from employees where last_name='Abel');