MULTISET UNION [ALL|DISTINCT]
. का उपयोग करें ऑपरेटर:
Oracle 11g R2 स्कीमा सेटअप :
CREATE OR REPLACE TYPE businessTableForCategories AS TABLE OF VARCHAR(128);
/
CREATE TABLE Category (
name VARCHAR(128) PRIMARY KEY,
businesses businessTableForCategories
) NESTED TABLE businesses STORE AS categoryBusinessTable
/
INSERT INTO Category VALUES (
'Restaurant',
businessTableForCategories('xzqpehc234ajdpa8')
)
/
UPDATE Category
SET businesses = businesses
MULTISET UNION ALL
businessTableForCategories('other_value')
WHERE name = 'Restaurant'
/
क्वेरी 1 :
SELECT *
FROM category
परिणाम :
| NAME | BUSINESSES |
|------------|------------------------------|
| Restaurant | xzqpehc234ajdpa8,other_value |
प्रश्न 2 :
या संग्रह को क्वेरी में शामिल करने के लिए बाइंड वैरिएबल का उपयोग करें:
DECLARE
businesses businessTableForCategories := businessTableForCategories();
BEGIN
businesses.EXTEND( 10000 );
FOR i IN 1 .. 10000 LOOP
businesses(i) := DBMS_RANDOM.STRING( 'x', 128 );
END LOOP;
INSERT INTO Category VALUES ( 'lots of data', businesses );
END;
क्वेरी 3 :
SELECT name, CARDINALITY( businesses )
FROM Category
परिणाम :
| NAME | CARDINALITY(BUSINESSES) |
|--------------|-------------------------|
| lots of data | 10000 |
| Restaurant | 2 |