By Hernando Bedoya; et al
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Extra info for Advanced functions and administration on DB2 Universal Database for iSeries
22 Advanced Functions and Administration on DB2 Universal Database for iSeries Unique constraint A unique constraint is the rule that identifies a unique key in a database file. A unique key is a field or a set of fields in a physical file that must be unique, ascending, and can contain null-capable fields. Primary key constraint A primary key constraint identifies a primary key in a database file. A primary key is a field or a set of fields in a physical file that must be unique, ascending, and cannot contain null-capable fields.
Parent key A parent key is a field or a set of fields in a physical file that must be unique, ascending, and contain null values. Both a primary and unique key can be the parent key in a referential constraint. Foreign key A foreign key is a field or a set of fields in a physical file whose value, if not null, must match a value of the parent key in the related referential constraint. The value of a foreign key is null if at least one of the key fields is null. Referential constraint A referential constraint is the file attribute that causes the database to enforce referential integrity for the defined relationship.
If an existing access path cannot be shared, a new one is created and owned by the physical file. The user does not have direct access to this newly created access path. Similarly, when a logical file or an SQL index is created on a physical file with existing constraints, the system tries to share the constraint access paths. See Database Programming, SC41-5701, for detailed information about access path sharing. Chapter 3. Referential integrity 25 If the existing access path has more than one key field, the constraint only shares that access path if they are defined with the same key fields in the same sequence.