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Boolean or logical operators enable multiple conditions to be specified in the WHERE clause of the SELECT statement This facilitates a more refined data extraction capability Consider isolating those employee records with FIRST_NAME values that begin with the letter J and that earn a COMMISSION_PCT greater than 10 percent First, the data in the EMPLOYEES table must be restricted to FIRST_NAME values like J% , and second, the COMMISSION_PCT values for the records must be tested to ascertain if they are larger than 10 percent These two separate conditions may be associated

using the Boolean AND operator and are applied consecutively in a WHERE clause A result set conforming to any or all conditions or to the negation of one or more conditions may be specified using the OR, AND, and NOT Boolean operators respectively

The AND operator merges conditions into one large condition to which a row must conform to be included in the results set If two conditions specified in a WHERE clause are joined with an AND operator, then a row is tested consecutively for conformance to both conditions before being retrieved If it conforms to neither or only one of the conditions, the row is excluded Employee records with FIRST_NAME values beginning with the letter J and COMMISSION_PCT greater than 10 percent can be retrieved using the following query:

To check which default color picker your program is set to use, do the following:

select first_name, last_name, commission_pct, hire_date from employees where first_name like 'J%' and commission_pct > 01;

Notice that the WHERE clause now has two conditions, but only one WHERE keyword The AND operator separates the two conditions To specify further mandatory conditions, simply add them and ensure that they are separated by additional AND operators You can specify as many conditions as you wish Remember, though, the more AND conditions specified, the more restrictive the query becomes

The OR operator separates multiple conditions, at least one of which must be satisfied by the row selected to warrant inclusion in the results set If two conditions specified in a WHERE clause are joined with an OR operator, then a row is tested consecutively for conformance to either or both conditions before being retrieved Conforming to just one of the OR conditions is sufficient for the record to be returned If it conforms to none of the conditions, the row is excluded Retrieving employee records having FIRST_NAME values beginning with the letter B or those with a COMMISSION_PCT greater than 35 percent can be written as:

1 Choose Edit | Preferences | General 2 Click the Color Picker drop-down arrow to identify your available options

select first_name, last_name, commission_pct, hire_date from employees where first_name like 'B%' or commission_pct > 035;

Notice that the two conditions are separated by the OR keyword All employee records with FIRST_NAME values beginning with an uppercase B will be returned regardless of their COMMISSION_PCT values, even if they are NULL Records with COMMISSION_PCT values greater that 35 percent (regardless of what letter their FIRST_NAME begins with) are also returned Further OR conditions may be specified by separating them with an OR operator The more OR conditions you specify, the less restrictive your query becomes

After identifying your options, you can change the color picker as needed To invoke the color picker after making a change, click OK to return to the main window Then, click on a color swatch in the foreground or background selector

The NOT operator negates conditional operators A selected row must conform to the logical opposite of the condition in order to be included in the results set Conditional operators may be negated by the NOT operator as shown by the WHERE clauses listed in Table 9-4

where last_name='King' where first_name LIKE 'R%' where department_id IN (10,20,30) where salary BETWEEN 1 and 3000 where commission_pct IS NULL Table 9-4

where NOT (last_name='King') where first_name NOT LIKE 'R%' where department_id NOT IN (10,20,30) where salary NOT BETWEEN 1 and 3000 where commission_pct IS NOT NULL

Photoshop s floating Color palette (shown in the following illustration) defaults to showing RGB color sliders While this is suitable for most web design, there are times when you may prefer to have this palette display only web-safe colors in the sliders This can easily be accomplished by switching the display from RGB sliders to web-safe color sliders

The NOT operator negates the comparison operator in a condition, whether it s an equality, inequality, range-based, pattern matching, set membership, or null testing operator