THE HISTORY OF POSTGRESQL in VS .NET

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THE HISTORY OF POSTGRESQL
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To fully appreciate PostgreSQL, it helps to know where it came from PostgreSQL started life as an academic database project at UC Berkeley Professor Michael Stonebraker is credited as the father of PostgreSQL In 1986 he started a project (then called Postgres) as a follow-up to another popular database packaged called Ingres Ingres started out as an academic project to prove theoretical database concepts about relational database structures In relational database theory, data is arranged in tables Tables of data can be connected together by related data This was a radical idea, compared to the existing types of database models at the time A classic example of a relational database is a typical store computer system This database must contain information on the store s customers, the products it carries, and the current inventory It must also keep track of orders made by customers In the past, all of this data would be jumbled together in multiple data files, often duplicating information between the files In relational database theory, data is divided into separate groups, called tables Customer information is stored in the Customer table The Customer table contains data pertinent to a customer, such as the customer name, address, and billing information Each customer is assigned a unique ID in the Customer table, with each customer record
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Figure 1-1 A sample relational database layout
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being a separate row in the Customer table Similarly, product data is stored in a separate Product table The Product table contains detailed information about each product, including a unique product ID, with each product being a separate row of data in the Product table This is demonstrated in Figure 1-1 As shown in Figure 1-1, to track orders, database programmers create a separate Order table using the unique IDs from the Customer and Product tables The Order table relates a customer to the products that are bought This relationship shows that a single customer can be related to multiple product orders, but each product order belongs to a single customer Ingres was one of the first database products available to handle these types of data relationships With its success, Ingres quickly became a commercial product, and Dr Stonebraker started working on another database system Postgres was started in a similar manner as Ingres, attempting to prove the academic theory of object-relational databases Object-relational databases take relational databases one step further In objectoriented programming, data can inherit properties from other data, called a parent The object-oriented principle of inheritance is applied in object-relational databases Tables can inherit fields from base tables (also called parent tables) For example, a database table of cars can inherit properties (fields) from a parent table of vehicles This is demonstrated in Figure 1-2
1:
What Is PostgreSQL
Vehicle Table
Vehicle ID Doors Wheels Weight
Inherited Fields Car Table
Make Model Engine Size Vehicle ID Doors Wheels Weight
Truck Table
Make Model Engine Size Load Capacity Vehicle ID Doors Wheels Weight
Figure 1-2 An example of an object-relational database
Since cars are a type of vehicle, they inherit the properties (or in this case database fields) of their parent, the Vehicle table When inserting data into the Car table, you can also specify values from the Vehicle table Querying the Car table will return fields from both the Vehicle and Car tables However, querying the Vehicle table only returns fields from that table, not the Car table After several years of development work on Postgres, the database package came upon a major change A couple of Dr Stonebraker s students modified Postgres by adding the Structured Query Language (SQL) interface (early versions of Postgres used their own data query language) In 1995 this package was re-released as Postgres95 Due to the rising popularity of SQL, the Postgres95 release helped Postgres migrate into the mainstream of database products It was clear that they had another hit product on their hands Instead of going commercial, in 1996 the Postgres95 project team broke off from UC Berkeley and started life as an Open Source project, open to the world to modify At the same time, to emphasize its newfound SQL capabilities, Postgres95 was renamed PostgreSQL (pronounced post-gres-Q-L) Also, to emphasize its past history, the first Open Source version of PostgreSQL was labeled as version 60 Vast improvements have been made to PostgreSQL since its first release in 1996 Many modern database features have been added to make each release of PostgreSQL faster, more robust, and more user-friendly For Windows users, the biggest PostgreSQL feature appeared in 2005 with the release of version 80 Prior to version 80, PostgreSQL lived its life primarily in the Unix world Developers wanting to experiment with PostgreSQL on a Windows platform had to perform some
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