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During data analysis, it sometimes happens that no single unique column can be found in the data structure. Theory suggests that the next best thing is to look for two or more columns that, when grouped together as the key, will ensure a unique row. When multiple columns are conjoined to form a key, the key is called a composite key or, sometimes, a compound key. If you come to Firebird with a cargo of background experience working with a DBMS such as Paradox, using composite keys to implement hierarchical relationships, it can be quite hard to part with the notion that you cannot live without them. Yet, in practice, composite keys should be considered with a high degree of restraint in a DBMS such as Firebird, which does not track through disk-based physical index structures to implement relationships. Firebird does not need composite indexes and, more to the point, composite indexes do impose some problems, both for development and, when large tables are involved, for performance: Composite keys are typically composed of non-atomic key elements that is, the columns selected have semantic meaning (they are significant as data ) and are almost certainly vulnerable to external changes and typographical errors. Any foreign keys in other tables that reference this table will have to propagate every element of the composite key. Referential integrity is at risk from the use of non-atomic keys. A combination of non-atomic elements compounds the risk. Keys foreign as well as primary have mandatory indexes. Composite indexes have stricter size limits than single-column indexes. Composite indexes tend to be large. Large indexes use more database pages, causing indexed operations (sorts, joins, and comparisons) to be slower than is necessary.

It is recommended practice to avoid involving in your primary and foreign keys any column that is meaningful as data. It violates one of the primary principles of relational database design, that of atomicity. The atomicity principle requires that each item of data exist completely in its own right, with a single, internal rule governing its existence. 274

For a primary key to be atomic, it should be beyond the reach of human decision. If a human has to spell it or type it, it is not atomic. If it is subject to any rule except the non-nullable, unique requirements, it is not atomic. Using the earlier example, even a systematic number such as a driver s license or a Social Security number does not have the atomicity required for a primary key, because it is subject to an external system.

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maintain state between calls. A stateful method is used in this example only to demonstrate this; it is not meant as the recommended way to implement this method.

< php class Employee { Let s say you need to allow for three categories of workers: regular workers, supervisors, and managers. You can define three constants, one per category: const CATEGORY_WORKER = 0; const CATEGORY_SUPERVISOR = 1; const CATEGORY_MANAGER = 2;

Several syntaxes are available for assigning the PRIMARY KEY constraint to a column or group of columns. All columns that are elements in a PRIMARY KEY must be previously defined as NOT NULL. Since it is not possible to add a NOT NULL constraint to a column after it has been created, it is essential to take care of this constraint before applying the additional constraint. The PRIMARY KEY constraint can be applied in any of the following phases of metadata creation: In the column definition, during CREATE TABLE or ALTER TABLE, as part of the column s definition set In the table definition, during CREATE TABLE or ALTER TABLE, as a separately defined table constraint

In the following sequence, a non-nullable domain is defined and committed ahead, then the primary key column is defined using that domain and, simultaneously, the PRIMARY KEY constraint is applied to the table immediately:

CREATE DOMAIN D_IDENTITY AS BIGINT NOT NULL; COMMIT; CREATE TABLE PERSON ( PERSON_ID D_IDENTITY PRIMARY KEY, ... );

Each employee classification has an associated job title and rate of pay. With this in mind, it seems reasonable to store those items of information in one or more arrays. Like other constants in PHP a class constant must be a scalar type such as an integer or a string; you cannot , use arrays or objects as constants. Since you might want to access information relating to employee categories independent of any given employee, create a couple of static arrays to hold job titles and rates of pay: public static $jobTitles = array('regular worker', 'supervisor', 'manager'); public static $payRates = array(5, 8.25, 17.5); Next, define a couple of static methods with which you can use the constants defined previously. They are both pretty simple: getCategoryInfo() takes a category number and returns the corresponding job title and rate of pay; calcGrossPay() takes two arguments (a number of hours and a category number) and returns the gross pay due an employee in that category working that many hours. Notice that when referring to static variables from within a method of that class whether it is a static method or an instance method you need to prefix the variable name with self::.

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