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Informix Universal Server supports collections of attributes through its collection data types. Three different collection data types are supported: I Lists. A list is an ordered collection of data items, all of which have the same type. Within a list, there is the concept of a first item, a last item, and the n-th item. The items in the list are not required to be unique. For example, a list of the first names of the employees hired in the last year, in order of hire, might be {'Jim', 'Mary', 'Sam', 'Jim', 'John'}. I Multisets. A multiset is an unordered collection of data items, all of which have the same type. There is no concept of a sequencing to the items in a multiset; its items have no implied ordering. The items are not required to be unique. The list of employee first names could be considered a multiset if you didn t care about the order of hire: {'Jim', 'Sam', 'John', 'Jim', 'Mary'}. I Sets. A set is an unordered collection of unique data items, all of which have the same type. As in a multiset, there is no concept of first or last; the set has no implied ordering. The items must have unique values. The first names in the previous examples wouldn t qualify, but the last names might: {'Johnson', 'Samuels', 'Wright', 'Jones', 'Smith'}.
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To illustrate the concept of collection data, we will expand the tables in our example object-relational database as follows: I The REPS table will include sales targets for each of the first, second, third, and fourth quarters. The quarterly targets can naturally be represented as a list column added to the REPS table. The quarters have a natural ordering (first through fourth), the quota for each quarter has the same data type (money), and the values are not necessarily unique (that is, the quotas for the first and second quarters might be the same). I The ENGINEERS table will include information about the academic degrees that each engineer holds. Two items of data will actually be stored about each degree the actual degree (B.S., Ph.D., MBA, and so on) and the school. This data will be stored as a multiset column added to the ENGINEERS table, because it s possible to have two identical entries for example, an engineer may have a B.S. degree in engineering and a B.S. degree in business from the same school. I The TECHNICIANS table will include information about the projects to which each technician is assigned. Each technician may be assigned to two or more projects, but each project has a unique name. This data will be stored as a set column added to the TECHNICIANS table. The data values must be unique, but no particular order is associated with them. Here are some Informix ALTER TABLE statements that implement these changes to the previously defined tables:
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ALTER TABLE REPS ADD QTR_TGT LIST(MONEY(9,2)); ALTER TABLE TECHNICIANS ADD PROJECT SET(VARCHAR(15)); ALTER TABLE ADD DEGREE SCHOOL ENGINEERS ( DEGREES MULTISET(ROW( VARCHAR(3), VARCHAR(15));
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/* four quarterly targets */
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/* projects assigned */
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/* degree info */
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These collection column types create a row-within-a-row structure within the table that contains them, as shown in Figure 24-6. In the case of the ENGINEERS table, the structure might more accurately be described as a table within a table. Clearly, the relational model of row/column tables with atomic data items has been stretched considerably by the introduction of collection data types. Informix Universal Server allows collections to be used quite generally and intermixed with other object-relational extensions. A collection can be a field of a row
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