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SQL Today and Tomorrow
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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(DECIMAL(9,2)); /* four quarterly targets */ ALTER TABLE TECHNICIANS ADD PROJECT SET(VARCHAR(15)); ALTER TABLE ADD DEGREE SCHOOL ENGINEERS DEGREES MULTISET(ROW( VARCHAR(3), VARCHAR(15))); /* projects assigned */ /* 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 to be intermixed with other object-relational extensions. A collection can be a field of a row data type. The items of a collection can be row data types. It s also possible to define collections within collections where that makes sense. For example, the projects in this example might have subprojects that must be tracked for each technician. At each level of additional complexity, the complexity of the stored procedure language (SPL) and of the SQL expressions that are required to manipulate the data items and process them increases accordingly. Oracle also provides extensive support for collection-type data, through two different Oracle object-relational extensions: Varying arrays A varying array is an ordered collection of data items, all having the same data type. There is no requirement that the items in the array be unique. You define the maximum number of data items that can occur when you specify a varying array type for a column. Oracle provides extensions to SQL to access the individual items within the array. Nested tables A nested table is an actual table within a table. A column with a nested table type contains individual data items that are themselves tables. Oracle actually stores the nested table data separately from the main table that contains it, but it uses SQL extensions to process nested references to the inner table. Unlike a varying array, a nested table can contain any number of rows.
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REPS Table NAME ADDRESS POSTCODE EMPL_NUM F_NAME M_INIT L_NAME STREET CITY STATE MAIN SFX SLS_MGR SALARY QUOTA QTR_TGT 4267 Nancy Q. Walsh 2598 $35,000 $750,000 $160,000 $190,000 $210,000 $190,000 4316 Jim F. Rea 2598 $32,000 $690,000 $120,000 $165,000 $190,000 $215,000
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TECHNICIANS Table NAME ADDRESS PROJECT bingo at las checkmate at las gonzo bingo POSTCODE EMPL_NUM F_NAME M_INIT L_NAME STREET CITY STATE MAIN SFX WAGE_RATE 1421 Joe P. Jones $16.75
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ENGINEERS Table NAME EMPL_NUM F_NAME M_INIT 1234 Bob J. F. 1374 Sam P. 1439 Sally ADDRESS POSTCODE DEGREES L_NAME STREET CITY STATE MAIN SFX SALARY YRS_EXPER DEGREE SCHOOL Smith $45,000 6 BS Michigan Purdue MS Wilson $30,000 12 BS Lebigh Watson $34,500 9 BS MIT MIT BS MBA Stanford
FIGURE 24-6
Tables with collection data typed columns
PART VI
Part VI:
SQL Today and Tomorrow
A column within a table can be declared to have a VARRAY (varying array) or TABLE OF (nested table) structure. Here are some Oracle CREATE TYPE and CREATE TABLE statements that use varying arrays and nested tables to achieve table structures like those shown in Figure 24-6:
CREATE TYPE TGT_ARRAY AS VARRAY(4) OF NUMBER(9,2); CREATE TABLE EMPL_NUM NAME ADDRESS SLS_MGR SALARY QUOTA QTR_TGT REPS ( NUMBER, NAME_TYPE, ADDR_TYPE, NUMBER, NUMBER(9,2), NUMBER(9,2), TGT_ARRAY);
/* /* /* /*
employee number of mgr */ annual salary */ sales quota */ four quarterly tgts */
CREATE TYPE DEGR_TYPE AS OBJECT ( DEGREE VARCHAR2(3), SCHOOL VARCHAR2(15)); CREATE TYPE DEGR_TABLE AS TABLE OF DEGR_TYPE; CREATE TABLE ENGINEERS ( EMPL_NUM NUMBER, NAME NAME_TYPE, ADDRESS ADDR_TYPE, SALARY NUMBER (9,2), /* annual salary */ YRS_EXPER NUMBER, /* years of experience */ DEGREES DEGR_TABLE) NESTED TABLE DEGREES STORE AS ENGINEERS_DEGREES;
The quarterly target information for the REPS table is most easily represented as an Oracle varying array column. There will be exactly four quarters of information, so the maximum size of the array is known in advance. In this example, the varying array contains a simple data item as its element, but it s also common to define varying arrays whose items are themselves abstract (structured) data types. The academic degree information for the ENGINEERS table is represented as a nested table. For a data item like this one, you could decide to place an upper limit on the number of rows and use a varying array structure instead, but in general, if the maximum number of items is unknown, a nested table is the right choice. In this case, the nested table has an abstract data type composed of two attributes. Each row of the nested table will contain information about a degree granted and the school that granted it.
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