SQL FULL JOIN Statement

  • FULL JOIN returns all matching records from both tables whether the other table matches or not.
  • FULL JOIN can potentially return very large datasets.
  • FULL JOIN and FULL OUTER JOIN are the same.

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The SQL FULL JOIN syntax

The general syntax is:

  1. SELECT columnnames
  2. FROM tablename1 FULL JOIN tablename2
  3. ON columnname1 = columnname2
  4. WHERE condition

The general FULL OUTER JOIN syntax is:

  1. SELECT columnnames
  2. FROM tablename1 FULL OUTER JOIN tablename2
  3. ON columnname1 = columnname2
  4. WHERE condition

SQL FULL JOIN Examples

Problem: Match all customers and suppliers by country

  1. SELECT C.FirstName, C.LastName, C.Country AS CustomerCountry,
  2. S.Country AS SupplierCountry, S.CompanyName
  3. FROM Customer C FULL JOIN Supplier S
  4. ON C.Country = S.Country
  5. ORDER BY C.Country, S.Country

This returns suppliers that have no customers in their country,
and customers that have no suppliers in their country,
and customers and suppliers that are from the same country.
Results: 195 records

FirstName LastName CustomerCountry SupplierCountry CompanyName
NULL NULL NULL Australia Pavlova, Ltd.
NULL NULL NULL Australia G’day, Mate
NULL NULL NULL Japan Tokyo Traders
NULL NULL NULL Japan Mayumi’s
NULL NULL NULL Netherlands Zaanse Snoepfabriek
NULL NULL NULL Singapore Leka Trading
Patricio Simpson Argentina NULL NULL
Yvonne Moncada Argentina NULL NULL
Sergio Gutiérrez Argentina NULL NULL
Georg Pipps Austria NULL NULL
Roland Mendel Austria NULL NULL
Pascale Cartrain Belgium NULL NULL
Catherine Dewey Belgium NULL NULL
Bernardo Batista Brazil Brazil Refrescos Americanas LTDA
Lúcia Carvalho Brazil Brazil Refrescos Americanas LTDA
Janete Limeira Brazil Brazil Refrescos Americanas LTDA
Aria Cruz Brazil Brazil Refrescos Americanas LTDA
André Fonseca Brazil Brazil Refrescos Americanas LTDA
Mario Pontes Brazil Brazil Refrescos Americanas LTDA
Pedro Afonso Brazil Brazil Refrescos Americanas LTDA
Paula Parente Brazil Brazil Refrescos Americanas LTDA
Anabela Domingues Brazil Brazil Refrescos Americanas LTDA
Elizabeth Lincoln Canada Canada Ma Maison
Elizabeth Lincoln Canada Canada Forêts d’érables
Yoshi Tannamuri Canada Canada Ma Maison
Yoshi Tannamuri Canada Canada Forêts d’érables
Jean Fresnière Canada Canada Ma Maison

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    بک لینک چیست؟
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    ربات های گوگل فرصت باز نگری یک ورقه لینک و پیوند های مو جود در آن را
    هم تحلیل کرده و بدین صفحه ها پیوند شده مراجعه می‌نمایند .
    به همین صورت مسیر حرکتی ربات گوگل در وب صورت می‌گیرد .

    متن لینک شده یا Anchor Text
    نوشته لینک شده بدین مضمون‌ است که پیوند بر
    روی چه عبارتی قرار داده شده‌است
    . بعنوان نمونه در پیشین همگانی بود که میگفتند “ برای ورود به تارنما اینجا کلیک نمایید ” و
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    در فعالیت عبارت “ اینجا ” نوشته پیوند شده یا این که به عبارتی Anchor Text به حساب می‌آید .

    زمانیکه گوگل یک بک پیوند به تارنما شمارا تماشا مینماید به انکر تکست اعتنا متعددی داشته
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    سایت شما درین عبارت خواهد بود .
    در صورتیکه تارنما شما با عبارت “ کتاب ” پیوند شده باشد منزلت شما وقتی که یک استفاده کننده
    در گوگل عبارت کتاب را کاوش می نماید خوبتر خواهد شد البته در صورتی‌که این لینک با عبارت “ گوشی ” ساخت شده باشد منزلت شما در عبارت
    “ گوشی ” بهبود خواهد یافت .

    خرید بک لینک از دید گوگل
    نسبتاً تمام وبمستران فعلا از تاثیر منفی خرید بک لینک بر سئوی وب
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    یکی‌از سوال های رایجی که خواننده گان وبلاگ مطرح می‌نمایند این است که , “ خرید بک لینک و پیوند از وب سایت های
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    جواب به‌این سوال عمل فراوان راحتی است
    , خرید بک پیوند فعالیت صدق نیست!
    در صورتی‌که بدنبال کسب مقام مطلوب در حاصل گوگل می باشید و طرح ریزی دراز مدتی برای عمل خویش دارید , خرید بک پیوند
    رویه قابل قبولی نمیباشد چون
    احتمال دارد شما‌را با اشتباهات دور از شوخی نظیر جریمه وبسایت بوسیله
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    سایت های دیگر به کاغذ یا این
    که تارنما شما می شناسد . با کسب رای بیش
    تر شما بخت برد در همه پرسی گوگل را خواهید داشت .
    گوگل صراحتا اعلام کرده که خرید بک لینک و پیوند برخلاف سیاست های این
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    فکر‌می‌کنند با خرید رای می توانند موتور کاوش را فریب داده و در‌این همه پرسی غالب
    باشند اما تحلیل گوگل بر خرید بک لینک و پیوند زیاد پیچیده و
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