Question about the Type of SQL equivalent Collection Oracle

(1) I read documentation collections oracle, can I know why the 'STORE AS' clause is used only when creating the table, but not when the object creation?

Table:

CREATE TYPE CourseList AS TABLE OF VARCHAR2(64);
CREATE TABLE department (
  name     VARCHAR2(20),
  director VARCHAR2(20),
  office   VARCHAR2(20),
  courses  CourseList)
  NESTED TABLE courses STORE AS courses_tab;

Object:

CREATE TYPE CourseList AS TABLE OF VARCHAR2(10)  -- define type
CREATE TYPE Student AS OBJECT ( -- create object
   id_num  INTEGER(4),
   name    VARCHAR2(25),
   address VARCHAR2(35),
   status CHAR(2),
   courses CourseList)  -- declare nested table as attribute

(2) also can I know what is the difference between OBJECT & RECORD?

My understanding is that the OBJECT is entity sql where you create and store data in this document, while the RECORDING is PLSQL entity where you group different types of data elements in one?, hope you can give me an example to better understand.

Thank you.

Ariean wrote:

(1) I read documentation collections oracle, can I know why the 'STORE AS' clause is used only when creating the table, but not when the object creation?

Fix. The column of the course are (similar to an array) collection type. This requires a "nested table" for this column store the list of the values in this column.

This approach however is an exception to the rule - as it flies in the face of robust and sound design mathematically, relational.

(2) also can I know what is the difference between OBJECT & RECORD?

A record is similar to a struct in C/C++. A record contains one or more fields/variables. It's a basic structure for the creation of a 'container of variables' and by the way this container between code units, as oppose to pass individual variables. It is also the basis for the creation of intelligent data structures in structured programming. For example an IP socket structure is a unique smart container consisting of items/variables such as socket, protocol family and type, flags address and so on.

It is a standard feature in most (if not all) of the structured programming languages - C / C++ and Pascal, Cobol and Visual Basic. PL/SQL is based on the Ada language - and like other members of language (including Pascal), PL/SQL uses the word registration reserve to set a record structure.

Objects are created in Oracle using the "create or replace type... as object'clause. The correct term is an object oriented class. This differs from a record as a class has data and code. Unlike a record that counts only data.

Given in a class are called properties. The code of a class is called methods. There are different types of member methods and methods such as the static class constructors, destructive methods.

Oracle class object is defined using SQL. (Methods) code of this class is set using PL/SQL.

The classes also supports features like inheritance. Allowing a child class extend the implementation of the parent class. This is not supported by a record structure, beyond a structure that contains another structure as a field attribute. Classes supports the substitution in a child class, the methods of the parent class. As records are composed only of data and not code, there is nothing like ito feature for structures Records.

Tags: Database

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