| CAST With Collections |
Using Multiset With A VARRAY |
CAST(MULTISET(<select statement>) AS <data_type>) |
CREATE OR REPLACE TYPE cust_address_t
OID '53A970B3F5024BEC8EFD4F84CAD5E09E'
AS OBJECT (
street_address VARCHAR2(40),
postal_code VARCHAR2(10),
city VARCHAR2(30),
state_province VARCHAR2(2),
country_id VARCHAR(2));
/
CREATE OR REPLACE TYPE address_book_t AS TABLE OF cust_address_t;
/
CREATE TABLE cust_address (
custno NUMBER(10),
street_address VARCHAR2(40),
postal_code VARCHAR2(10),
city VARCHAR2(30),
state_province VARCHAR2(2),
country_id VARCHAR2(2));
INSERT INTO cust_address
VALUES (1,'123 Main St.','98040','Mercer Island','WA','US');
INSERT INTO cust_address
VALUES (2,'1 Broadway','10202','New York','NY','US');
INSERT INTO cust_address
VALUES (3,'2462 Edgar Crest','V6L 2C4','Vancouver','BC','CN');
COMMIT;
CREATE TABLE cust_short (
custno NUMBER(10),
name VARCHAR2(30));
INSERT INTO cust_short VALUES (1,'Morgan');
INSERT INTO cust_short VALUES (2,'Cline');
INSERT INTO cust_short VALUES (3,'Scott');
SELECT s.custno, s.name,
CAST(MULTISET(SELECT ca.street_address,
ca.postal_code,
ca.city,
ca.state_province,
ca.country_id
FROM cust_address ca
WHERE s.custno = ca.custno) AS address_book_t)
FROM cust_short s; |
| |
Using Multiset With a PL/SQL Table |
CAST(MULTISET(<select statement>) AS <data_type>) |
CREATE OR REPLACE TYPE project_table_t AS
TABLE OF VARCHAR2(25);
/
CREATE TABLE projects (
person_id NUMBER(10),
project_name VARCHAR2(20));
CREATE TABLE pers_short (
person_id NUMBER(10),
last_name VARCHAR2(25));
INSERT INTO projects VALUES (1, 'Teach');
INSERT INTO projects VALUES (1, 'Code');
INSERT INTO projects VALUES (2, 'Code');
INSERT INTO pers_short VALUES (1, 'Morgan');
INSERT INTO pers_short VALUES (2, 'Cline');
INSERT INTO pers_short VALUES (3, 'Scott');
COMMIT;
SELECT * FROM projects;
SELECT * FROM pers_short;
SELECT e.last_name,CAST(MULTISET(
SELECT p.project_name
FROM projects p
WHERE p.person_id = e.person_id
ORDER BY p.project_name) AS project_table_t)
FROM pers_short e; |
| |
Using Multiset With A Multi-column Collection |
CAST(MULTISET(<select statement>) AS <data_type>) |
CREATE OR REPLACE TYPE uob_type AS OBJECT (
object_name VARCHAR2(128), object_type VARCHAR2(18));
/
CREATE OR REPLACE TYPE t_uob_type AS TABLE OF uob_type;
/
set serveroutput on
DECLARE
x t_uob_type;
BEGIN
SELECTCAST(MULTISET(
SELECT object_name, object_type
FROM user_objects
WHERE rownum <10) AS t_uob_type)
INTO x
FROM dual;
FOR i IN 1 .. x.COUNT
LOOP
dbms_output.put_line(x(i).object_name || ' - '
|| x(i).object_type);
END LOOP;
END;
/ |
| |
Converting a Varray Type Column Into A Nested Table |
CAST(<column_or_value> AS <data_type>) |
CREATE OR REPLACE TYPE district_t AS OBJECT (
region_no NUMBER(2),
title VARCHAR2(35),
cost NUMBER(7,2));
/
CREATE TYPE DistList_t AS TABLE OF district_t;
/
CREATE TYPE DistrictList AS VARRAY(10) OF district_t;
/
CREATE TABLE region_tab (
reg_id NUMBER(2),
reg_name VARCHAR2(15),
district DistrictList);
set describe depth all linenum on indent on
desc region_tab
SELECT * FROM region_tab;
INSERT INTO region_tab
VALUES(30, 'Northwest',
DistrictList (District_t(1, 'Alaska', 3250),
District_t(2, 'Washington', 12350),
District_t(3, 'Oregon', 2750),
District_t(4, 'Idaho', 1425)));
INSERT INTO region_tab
VALUES(40, 'Southwest',
DistrictList (District_t(1, 'Arizona', 3250),
District_t(2, 'California', 12350),
District_t(3, 'Nevada', 2750),
District_t(4, 'New Mexico', 1425)));
SELECTCAST(s.district AS DistList_t)
FROM region_tab s
WHERE s.reg_id = 30; |
| |
| CAST With Dates |
| Date |
CAST(<column_or_value> AS <data_type>) |
SELECTCAST('01-JAN-2004' AS DATE) CDate
FROM dual; |
| Timestamp |
CAST(<column_or_value> AS <data_type>) |
SELECTCAST(SYSDATE AS TIMESTAMP WITH LOCAL TIME ZONE) DTWTZ
FROM dual; |
| |
| CAST With Numbers |
| Number |
CAST(<column_or_value> AS <data_type>) |
SELECT 1 +CAST(3.14 * 0.152 AS NUMBER(10,7)) FLOATING
FROM dual; |
| |
| CAST With Strings |
| Varchar2 |
CAST(<column_or_value> AS <data_type>) |
SELECT object_name
FROM user_objects;
SELECTCAST(object_name AS VARCHAR2(30)) OBJ_NAME
FROM user_objects; |
|
