Database Overview
A database is a collection of organized and structured data, stored in the computer as files. Various data types like numeric, textual, image, multimedia etc., can be managed and maintained more...
View ArticleOracle Database Objects Overview
A database can have many schemas; one schema can contain multiple database objects like tables, views, Synonym etc. A brief explanation on each of these Oracle database objects is given below. For...
View ArticleDatabase: Sample Data
With a simple example of designing a data model with “employee related information”, most of the data structures can be easily understood. So we will try to design a data model using the sample data...
View ArticleSample Data Analysis
Database: Sample Data Analysis For the sample data provided in the previous page table, as a Data Modeler you have to design logical data model, physical data model and generate DDL scripts. In order...
View ArticleOracle DDL Statements – CREATE Commands
Create Commands: To execute Oracle database commands, you need Oracle’s username, password and oracle instance name to connect to oracle database. If you haven’t got the username, contact database...
View ArticleOracle Database Data Definition Language(DDL Statements) – ALTER Commands:
In this section, we will try to explain about important database ALTER commands that are used by a data modeler by relating it with our example data. ALTER TABLE – Add column: ALTER TABLE EMPLOYEE_DTL...
View ArticleOracle Database Data Manipulation Language (DML) Commands
In this section, we will try to explain about important database DML commands that are used by a data modeler. Insert statements: Insert Values into GENDER_LKP: Insert statements are used to insert...
View ArticleOracle Database Data Definition Language(DDL Statements)- DROP Object Commands
Oracle Database Data Definition Language(DDL Statements)- DROP Object Commands: In this section, we will try to explain about important database DROP commands that are used by a data modeler by...
View ArticleOracle important DDL Statements
Commit statement: This statement enables all changes to be saved to the database. COMMIT; Rollback statement: This statement enables all changes to be rolled back (undo action) from the database....
View ArticleOracle’s Database Dictionary Views
These SQL commands are related with Oracle’s data dictionary and can be used to get information about different database objects. Select statement – To find out the oracle’s views: This select...
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