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Oracle Database Assignment Help and SQL Tutorials

Oracle Database

An Oracle database is a collection of data treated as a unit. The purpose of a database is to store and retrieve related information. The Oracle Database (Oracle RDBMS) is the most popular object relational database management system (ORDBMS).

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However, it is well known the SQL is a powerful query language with the capability to formulate very complex queries. The straight forward syntax of the SQL SELECT command is often misleading, and generates an impression of simplicity in students’ minds. Students have well verse knowledge of Primary key, Unique key, Foreign key and relationship between them. Through simple SQL statement commands such as CREATE, ALTER, UPDATE, INSERT, DELETE, COMMIT, ROLLBACK, ALTER SESSION and many more, we can modify the database table easily.

Primary Key

A Primary Key is a column or combination of columns whose values uniquely identify a row or record in the table. The primary key(s) have a unique value for each record or row in the table. A primary key can consist of one or more fields on a table. When multiple fields are used as a primary key, they are called a Composite Key.

Examples for specifying a primary key when creating a table (using CREATE TABLE) or by changing the existing table structure (using ALTER TABLE).

Oracle Help
Primary Key CREATE table Student (
Sid integer PRIMARY KEY,
FirstName varchar(30),
LastName varchar(30));
CREATE table Student (
Sid integer,
FirstName varchar(30),
LastName varchar(30),

CREATE table Student (
Sid integer PRIMARY KEY,
FirstName varchar(30),
LastName varchar(30));
Specifying a primary key by Altering a table ALTER TABLE Student ADD PRIMARY KEY (Sid); ALTER TABLE Student ADD PRIMARY KEY (Sid);




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