Inheritance & PolymorphismIn Relational Databases

•Transferir como PPT, PDF•

5 gostaram•4,939 visualizações

elliando dias

Diversão e humor Tecnologia

Inheritance & Polymorphism In Relational Databases solving some common problems in web development

The Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Own Tables ,[object Object],[object Object],[object Object],[object Object],SELECT * FROM books WHERE id = 7 SELECT id, title, ‘book’ AS type FROM books UNION SELECT id, title, ‘television’ AS type FROM televisions

Single table inheritance (STI) ,[object Object],[object Object],[object Object],[object Object],SELECT * FROM products WHERE id = 7 SELECT id, title, type FROM products

Class Table Inheritance (CTI) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SELECT books.*, products.* FROM books JOIN products ON(products.id = books.product_id) WHERE books.id = 7 SELECT products.id, products.title, books.id, televisions.id FROM products LEFT JOIN books ON(books.product_id = products.id) LEFT JOIN televisions ON(televisions.product_id = products.id)

Another Problem ,[object Object],[object Object],[object Object]

Multiple Tables ,[object Object],[object Object],[object Object]

Multiple Relationships ,[object Object],[object Object],[object Object],[object Object],[object Object]

Class Table Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Polymorphism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mais conteúdo relacionado

Mais de elliando dias

Clojurescript slideselliando dias

Why you should be excited about ClojureScriptelliando dias

Functional Programming with Immutable Data Structureselliando dias

Nomenclatura e peças de containerelliando dias

Geometria Projetivaelliando dias

Polyglot and Poly-paradigm Programming for Better Agilityelliando dias

Javascript Librarieselliando dias

How to Make an Eight Bit Computer and Save the World!elliando dias

Ragel talkelliando dias

A Practical Guide to Connecting Hardware to the Webelliando dias

Introdução ao Arduinoelliando dias

Minicurso arduinoelliando dias

Incanter Data Sorceryelliando dias

Rangoelliando dias

Fab.in.a.box - Fab Academy: Machine Designelliando dias

The Digital Revolution: Machines that makeselliando dias

Hadoop + Clojureelliando dias

Hadoop - Simple. Scalable.elliando dias

Hadoop and Hive Development at Facebookelliando dias

Multi-core Parallelization in Clojure - a Case Studyelliando dias

Mais de elliando dias (20)

Clojurescript slides

Why you should be excited about ClojureScript

Functional Programming with Immutable Data Structures

Nomenclatura e peças de container

Geometria Projetiva

Polyglot and Poly-paradigm Programming for Better Agility

Javascript Libraries

How to Make an Eight Bit Computer and Save the World!

Ragel talk

A Practical Guide to Connecting Hardware to the Web

Introdução ao Arduino

Minicurso arduino

Incanter Data Sorcery

Rango

Fab.in.a.box - Fab Academy: Machine Design

The Digital Revolution: Machines that makes

Hadoop + Clojure

Hadoop - Simple. Scalable.

Hadoop and Hive Development at Facebook

Multi-core Parallelization in Clojure - a Case Study

Último

𓀤Call On 6297143586 𓀤 Ultadanga Call Girls In All Kolkata 24/7 Provide Call W...rahim quresi

Navsari Escorts Service ☎️ 6378878445 ( Sakshi Sinha ) High Profile Call Girl...mriyagarg453

Hotel And Home Service Available Kolkata Call Girls Sonagachi ✔ 6297143586 ✔C...ritikasharma

Zirakpur Call Girls👧 Book Now📱8146719683 📞👉Mohali Call Girl Service No Advanc...rajveermohali2022

Model Call Girls In Ariyalur WhatsApp Booking 7427069034 call girl service 24... Shivani Pandey

Science City Kolkata ( Call Girls ) Kolkata ✔ 6297143586 ✔ Hot Model With Sex...rahim quresi

CHEAP Call Girls in Malviya Nagar, (-DELHI )🔝 9953056974🔝(=)/CALL GIRLS SERVICE9953056974 Low Rate Call Girls In Saket, Delhi NCR

Top Rated Pune Call Girls Dhayari ⟟ 6297143586 ⟟ Call Me For Genuine Sex Ser...Call Girls in Nagpur High Profile

Verified Trusted Call Girls Ambattur Chennai ✔✔7427069034 Independent Chenna... Shivani Pandey

(TOP CLASS) Call Girls In Nungambakkam Phone 7427069034 Call Girls Model With... Shivani Pandey

Kanpur call girls 📞 8617697112 At Low Cost Cash Payment BookingNitya salvi

❤Personal Whatsapp Number Mukteshwar Call Girls 8617697112 💦✅.Nitya salvi

Beautiful 😋 Call girls in Lahore 03210033448ont65320

❤Personal Whatsapp Number Keylong Call Girls 8617697112 💦✅.Nitya salvi

Hotel And Home Service Available Kolkata Call Girls South End Park ✔ 62971435...ritikasharma

Bhimtal ❤CALL GIRL 8617697112 ❤CALL GIRLS IN Bhimtal ESCORT SERVICE❤CALL GIRLNitya salvi

𓀤Call On 6297143586 𓀤 Sonagachi Call Girls In All Kolkata 24/7 Provide Call W...rahim quresi

Model Call Girls In Pazhavanthangal WhatsApp Booking 7427069034 call girl ser... Shivani Pandey

Top Rated Kolkata Call Girls Khardah ⟟ 6297143586 ⟟ Call Me For Genuine Sex S...ritikasharma

Call Girls Bhandara Just Call 8617697112 Top Class Call Girl Service AvailableNitya salvi

Último (20)

𓀤Call On 6297143586 𓀤 Ultadanga Call Girls In All Kolkata 24/7 Provide Call W...

Navsari Escorts Service ☎️ 6378878445 ( Sakshi Sinha ) High Profile Call Girl...

Hotel And Home Service Available Kolkata Call Girls Sonagachi ✔ 6297143586 ✔C...

Zirakpur Call Girls👧 Book Now📱8146719683 📞👉Mohali Call Girl Service No Advanc...

Model Call Girls In Ariyalur WhatsApp Booking 7427069034 call girl service 24...

Science City Kolkata ( Call Girls ) Kolkata ✔ 6297143586 ✔ Hot Model With Sex...

CHEAP Call Girls in Malviya Nagar, (-DELHI )🔝 9953056974🔝(=)/CALL GIRLS SERVICE

Top Rated Pune Call Girls Dhayari ⟟ 6297143586 ⟟ Call Me For Genuine Sex Ser...

Verified Trusted Call Girls Ambattur Chennai ✔✔7427069034 Independent Chenna...

(TOP CLASS) Call Girls In Nungambakkam Phone 7427069034 Call Girls Model With...

Kanpur call girls 📞 8617697112 At Low Cost Cash Payment Booking

❤Personal Whatsapp Number Mukteshwar Call Girls 8617697112 💦✅.

Beautiful 😋 Call girls in Lahore 03210033448

❤Personal Whatsapp Number Keylong Call Girls 8617697112 💦✅.

Hotel And Home Service Available Kolkata Call Girls South End Park ✔ 62971435...

Bhimtal ❤CALL GIRL 8617697112 ❤CALL GIRLS IN Bhimtal ESCORT SERVICE❤CALL GIRL

𓀤Call On 6297143586 𓀤 Sonagachi Call Girls In All Kolkata 24/7 Provide Call W...

Model Call Girls In Pazhavanthangal WhatsApp Booking 7427069034 call girl ser...

Top Rated Kolkata Call Girls Khardah ⟟ 6297143586 ⟟ Call Me For Genuine Sex S...

Call Girls Bhandara Just Call 8617697112 Top Class Call Girl Service Available