Oracle Collections
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Collections in Oracle allow storing ordered groups of elements of the same data type, including index-by tables which are like hash tables, nested tables which are like sets, and vArrays which maintain order but have a fixed size; different collection types can be used as columns in database tables or passed as parameters between procedures; initializing, extending, counting, deleting, and retrieving elements from collections is done using collection methods.
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This document provides an overview of databases and SQL. It begins by defining what a database is and the different types, including relational and non-relational databases. It then explains what SQL is and how it is used to perform CRUD operations on relational databases. The document outlines database structure and what tables are. It also describes key SQL concepts like data types, commands, queries, constraints, joins and more.
OOPs with java
Java provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type.
An array is used to store a collection of data, but it is often more useful to think of an array as a collection of
variables of the same type.
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- 1. Oracle - Collections Kaushik Raghupathi
- 11. Passing Collections as Parameters DECLARE TYPE Roster IS TABLE OF VARCHAR2(15); names Roster := Roster('J Hamil', 'D Piro', 'R Singh'); i BINARY_INTEGER := 2; BEGIN verify_name(names(i)); -- call procedure END;
- 12. Using Collections in Tables CREATE TYPE ProjectList AS VARRAY(50) OF VARCHAR2(16); / CREATE TABLE department ( -- create database table dept_id NUMBER(2), name VARCHAR2(15), budget NUMBER(11,2), -- Each department can have up to 50 projects. projects ProjectList) /
- 13. Using Collections in Tables INSERT INTO department VALUES(60, 'Security', 750400, ProjectList('New Badges', 'Track Computers', 'Check Exits')); Try selecting data from the table
- 14. Using Collections in Tables SELECT a.* FROM TABLE(SELECT projects FROM department) a