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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..

SELECT * FROM INVENTORY WHERE IN_STOCK < 20 AND NOT RETAIL_PRICE < 15.00;

24:

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

The NOT keyword changes the query results. As you can see, three rows are returned:

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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COMPACT_DISC_ID --------------99301 99304 99305 CD_TITLE ---------------------Famous Blue Raincoat Past Light Kojiki COPYRIGHT --------1991 1983 1990 RETAIL_PRICE -----------16.99 15.99 15.99 IN_STOCK -------6 2 5

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

The returned rows each contain an IN_STOCK value of less than 20 and a RETAIL_ PRICE value that is not less than 15.00, or 15.00 or greater. Next we ll look at the same SELECT statement, only this time the two predicates are connected by the OR keyword, as shown in the following example:

Part VI:

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:

SELECT * FROM INVENTORY WHERE IN_STOCK < 20 OR RETAIL_PRICE < 15.00;

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);

The query results for this statement include many more rows than when the AND keyword was used. By its very nature, the OR keyword permits greater opportunities for a search clause to evaluate to true. As you can see, six rows have now been returned:

/* /* /* /*

employee number of mgr */ annual salary */ sales quota */ four quarterly tgts */

COMPACT_DISC_ID --------------99301 99302 99303 99304 99305 99306 CD_TITLE ---------------------Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling COPYRIGHT --------1991 1971 1974 1983 1990 1993 RETAIL_PRICE -----------16.99 14.99 14.99 15.99 15.99 10.99 IN_STOCK -------6 26 18 2 5 3

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;

Each row in the query results contains an IN_STOCK value of less than 20 or a RETAIL_ PRICE value of less than 15.00. Because the OR keyword is being used, only one of the predicates needs to evaluate to true, although it s acceptable if both predicates evaluate to true. In the next example, I add one more predicate that limits the rows returned to those with an IN_STOCK value greater than 5, along with parentheses to make my intentions clear:

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