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The ::= symbol (two consecutive colons plus an equals sign) is used in the SQL:2006 standard to separate a placeholder in the angle brackets from its definition. In the preceding syntax, the <referential action> placeholder is defined. The placeholder is used in the code preceding the definition. You would then take the definition (the five keywords) and use them in place of the <referential action> placeholder as it is used in the ON UPDATE and ON DELETE clauses.

Let us now extend the temperature conversion program presented in Example 4.7 to include the following additional features: 1. 2. 3. Display the equivalent temperature in either full precision (maximum number of decimal places) or rounded to the nearest integer. Display the equivalent temperature in either a large (12-point) font or a small (8-point) font. Display the absolute temperature, in addition to the converted temperature (i.e., display the temperature in degrees Kelvin in addition to degrees Celsius, or in degrees Rankin in addition to degrees Fahrenheit). Note that K = C + 273.15, and R = F + 459.67.

As you can see from the syntax, you can define an ON UPDATE clause, an ON DELETE clause, or both, and you can define them in any order. For each of these clauses you can choose one of five referential actions:

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If CASCADE is used and data is updated or deleted in the referenced columns, the data in the referencing columns is updated or deleted. If SET NULL is used and data is updated or deleted in the referenced columns, the values in the corresponding referencing columns are set to null. Null values have to be supported in the referencing columns for this option to work. If SET DEFAULT is used and data is updated or deleted in the referenced columns, the values in the corresponding referencing columns are set to their default values. Default values must be assigned to the referencing columns for this option to work. If RESTRICT is used and you try to update or delete data in your referenced columns that would cause a foreign key violation, you are prevented from performing that action. Data in the referencing columns can never violate the FOREIGN KEY constraint, not even temporarily. If NO ACTION is used and you try to update or delete data in your referenced columns that would cause a foreign key violation, you are prevented from performing that action. However, data violations can occur temporarily under certain conditions during the execution of an SQL statement, but the data in the foreign key is never violated in its final state (at the end of that execution). The NO ACTION option is the default used for both updates and deletes, if no referential triggered action is specified.

4:

Balanced Scorecard 1. A strategic management system. 2. Relates to a longer-term view of the business.

If you decide to use the <referential triggered action> clause, you simply add it to the end of your FOREIGN KEY constraint definition, as shown in the following SQL statement:

CREATE TABLE ARTISTS_MUSIC_TYPES ( ARTIST_NAME VARCHAR(60), DOB DATE, TYPE_ID INT, CONSTRAINT FK_CD_ARTISTS FOREIGN KEY ( ARTIST_NAME, DOB ) REFERENCES PERFORMING_ARTISTS ON UPDATE CASCADE ON DELETE CASCADE );

To implement these features, we will place the original two option buttons (indicating the type of conversion) within a frame. We will also place two more option buttons (to select the precision) within a second frame, and an additional two option buttons (to select the font size) within a third frame. In addition, we will use a check box to display the absolute temperature as an option. We will also add a new label and a new text box, to label and display the absolute temperature. Fig. 4.24 shows the preliminary Form Design Window layout.

If you update data in or delete data from the referenced columns in PERFORMING_ ARTISTS, those changes will be made to the referencing columns in the ARTISTS_MUSIC_ TYPES table.

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3. Designed to develop a balanced set of measurements 4. Identifies measurements around vision and values. 5. Critical management processes are to clarify vision/strategy, communicate, plan, set targets, align strategic initiatives, and enhance feedback and learning. 6. Balances customer and internal operations without a clearly defined leadership role. 7. Emphasizes targets for each measurement. 8. Emphasizes learning of executives based on the feedback. 9. Focuses on growth. 10. Heavy on strategic intent. 11. Management system consisting of measurements.

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