{"id":25532,"date":"2025-07-08T00:15:22","date_gmt":"2025-07-07T21:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-farkli-sutunlara-sahip-iki-tabloyu-birlestirme\/"},"modified":"2025-07-08T00:15:22","modified_gmt":"2025-07-07T21:15:22","slug":"postgresql-farkli-sutunlara-sahip-iki-tabloyu-birlestirme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-farkli-sutunlara-sahip-iki-tabloyu-birlestirme\/","title":{"rendered":"PostgreSQL: Farkl\u0131 S\u00fctunlara Sahip \u0130ki Tabloyu Birle\u015ftirme"},"content":{"rendered":"<p># PostgreSQL&#8217;de Farkl\u0131 S\u00fctunlu \u0130ki Tabloyu Birle\u015ftirme<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda iki farkl\u0131 tablo var ve bu tablolar\u0131 birle\u015ftirerek tek bir sonu\u00e7 k\u00fcmesi elde etmeniz gerekiyor, ancak tablolar\u0131n\u0131z\u0131n s\u00fctun yap\u0131lar\u0131 ayn\u0131 de\u011fil. Bu durum, bir\u00e7ok veri analisti ve geli\u015ftirici i\u00e7in s\u0131k kar\u015f\u0131la\u015f\u0131lan bir problemdir. Bu makale, PostgreSQL&#8217;de farkl\u0131 s\u00fctunlu iki tabloyu birle\u015ftirmenin farkl\u0131 y\u00f6ntemlerini, ger\u00e7ek d\u00fcnya \u00f6rneklerini ve performans optimizasyon tekniklerini ad\u0131m ad\u0131m a\u00e7\u0131klayarak, bu soruna pratik \u00e7\u00f6z\u00fcmler sunmaktad\u0131r.  PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc birle\u015ftirme (JOIN) i\u015flemlerini kullanarak verilerinizi nas\u0131l etkili bir \u015fekilde birle\u015ftirebilece\u011finizi \u00f6\u011freneceksiniz.<\/p>\n<p><strong>PostgreSQL Birle\u015ftirme \u0130\u015flemleri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL&#8217;de, farkl\u0131 s\u00fctunlu tablolar\u0131 birle\u015ftirmek i\u00e7in \u00e7e\u015fitli birle\u015ftirme (JOIN) t\u00fcrlerini kullanabilirsiniz.  Temel olarak, birle\u015ftirme i\u015flemi, iki veya daha fazla tablodaki verileri, ortak bir s\u00fctun (veya s\u00fctunlar) \u00fczerinden ili\u015fkilendirir.  Ortak s\u00fctun yoksa,  <code class=\"language-\">FULL OUTER JOIN<\/code> gibi farkl\u0131 stratejiler kullanman\u0131z gerekebilir. Bu b\u00f6l\u00fcmde, en yayg\u0131n kullan\u0131lan birle\u015ftirme t\u00fcrlerini ve bunlar\u0131n kullan\u0131m alanlar\u0131n\u0131 inceleyece\u011fiz:<\/p>\n<p>* <strong>INNER JOIN:<\/strong> Sadece ortak s\u00fctunlarda e\u015fle\u015fen sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcr. Ortak olmayan sat\u0131rlar g\u00f6z ard\u0131 edilir.  En s\u0131k kullan\u0131lan birle\u015ftirme t\u00fcr\u00fcd\u00fcr.<\/p>\n<p>* <strong>LEFT (OUTER) JOIN:<\/strong> Sol tablodaki (ilk belirtilen tablo) t\u00fcm sat\u0131rlar\u0131 ve bunlara e\u015fle\u015fen sa\u011f tablodaki sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcr. Sol tabloda e\u015fle\u015fmeyen sat\u0131rlar i\u00e7in sa\u011f tablodaki s\u00fctunlar NULL de\u011ferleriyle doldurulur.<\/p>\n<p>* <strong>RIGHT (OUTER) JOIN:<\/strong> Sa\u011f tablodaki (ikinci belirtilen tablo) t\u00fcm sat\u0131rlar\u0131 ve bunlara e\u015fle\u015fen sol tablodaki sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcr. Sa\u011f tabloda e\u015fle\u015fmeyen sat\u0131rlar i\u00e7in sol tablodaki s\u00fctunlar NULL de\u011ferleriyle doldurulur.<\/p>\n<p>* <strong>FULL (OUTER) JOIN:<\/strong> Hem sol hem de sa\u011f tablodaki t\u00fcm sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcr. E\u015fle\u015fen sat\u0131rlar birle\u015ftirilir, e\u015fle\u015fmeyen sat\u0131rlar ise NULL de\u011ferleriyle doldurulur.<\/p>\n<p><strong>PostgreSQL&#8217;de Farkl\u0131 S\u00fctunlu Tablolar\u0131 Birle\u015ftirme: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p>\u015eimdi, farkl\u0131 s\u00fctunlu iki tabloyu birle\u015ftirmek i\u00e7in ad\u0131m ad\u0131m bir k\u0131lavuza ge\u00e7elim.  \u00d6rnek olarak, bir &#8220;m\u00fc\u015fteriler&#8221; ve bir &#8220;sipari\u015fler&#8221; tablomuz oldu\u011funu varsayal\u0131m.  M\u00fc\u015fteriler tablosunda m\u00fc\u015fteri ID, ad ve soyad bulunurken, sipari\u015fler tablosunda sipari\u015f ID, m\u00fc\u015fteri ID ve sipari\u015f tarihi bulunur.  Amac\u0131m\u0131z, her m\u00fc\u015fterinin sipari\u015f tarihini i\u00e7eren bir tablo olu\u015fturmakt\u0131r.<\/p>\n<p><strong># Yeni Ba\u015flayanlar \u0130\u00e7in: Basit Bir \u00d6rnek<\/strong><\/p>\n<p>\u0130ki tabloda ortak olan &#8220;m\u00fc\u015fteri_id&#8221; s\u00fctununu kullanarak bir <code class=\"language-\">INNER JOIN<\/code> i\u015flemi ger\u00e7ekle\u015ftirece\u011fiz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    musteriler.musteri_id,\n    musteriler.ad,\n    musteriler.soyad,\n    siparisler.siparis_tarihi\nFROM\n    musteriler\nINNER JOIN\n    siparisler ON musteriler.musteri_id = siparisler.musteri_id;<\/code><\/pre>\n<p>Bu sorgu, her iki tabloda da m\u00fc\u015fteri ID&#8217;si e\u015fle\u015fen sat\u0131rlar\u0131 birle\u015ftirir. E\u015fle\u015fmeyen sat\u0131rlar sonu\u00e7ta g\u00f6r\u00fcnmez.<\/p>\n<p><strong># Orta Seviye: Ger\u00e7ek Hayat \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi daha ger\u00e7ek\u00e7i bir senaryo ele alal\u0131m.  M\u00fc\u015fteriler tablosunda baz\u0131 m\u00fc\u015fteriler i\u00e7in sipari\u015f bulunmayabilir. Bu durumda, t\u00fcm m\u00fc\u015fterileri g\u00f6rmek ve sipari\u015fleri olmayan m\u00fc\u015fteriler i\u00e7in sipari\u015f tarihini NULL olarak g\u00f6stermek istiyoruz.  Bunun i\u00e7in <code class=\"language-\">LEFT JOIN<\/code> kullanaca\u011f\u0131z:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    m.musteri_id,\n    m.ad,\n    m.soyad,\n    s.siparis_tarihi\nFROM\n    musteriler m\nLEFT JOIN\n    siparisler s ON m.musteri_id = s.musteri_id;<\/code><\/pre>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">musteri_id<\/code> s\u00fctununa her iki tabloda da indeks eklemek, sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.<br \/>\n* <strong>WHERE ko\u015fullar\u0131:<\/strong> Gereksiz verileri filtrelemek i\u00e7in <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131 ekleyin.  \u00d6rne\u011fin, belirli bir tarih aral\u0131\u011f\u0131ndaki sipari\u015fleri listelemek i\u00e7in <code class=\"language-\">WHERE s.siparis_tarihi BETWEEN '2023-01-01' AND '2023-12-31'<\/code> ekleyebilirsiniz.<br \/>\n* <strong>EXPLAIN ANALYZE:<\/strong>  Sorguyu analiz etmek ve performans\u0131n\u0131 iyile\u015ftirmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullan\u0131n.  Bu komut, sorgu plan\u0131n\u0131 ve y\u00fcr\u00fctme s\u00fcresini g\u00f6sterir.<\/p>\n<p><strong># \u0130leri D\u00fczey: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck tablolarla \u00e7al\u0131\u015f\u0131rken, birle\u015ftirme i\u015flemlerinin performans\u0131 kritik \u00f6nem ta\u015f\u0131r.  Bu a\u015famada,  <code class=\"language-\">EXPLAIN ANALYZE<\/code>  komutunu kullanarak sorgu plan\u0131n\u0131 analiz etmek ve performans\u0131 iyile\u015ftirmek i\u00e7in farkl\u0131 stratejiler denemek \u00f6nemlidir.  \u00d6rne\u011fin, farkl\u0131 birle\u015ftirme t\u00fcrleri veya indeksleme stratejileri deneyebilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong><\/p>\n<p>* <strong>Veri tutars\u0131zl\u0131klar\u0131:<\/strong>  Ortak s\u00fctunlardaki veri tutars\u0131zl\u0131klar\u0131 (\u00f6rne\u011fin, farkl\u0131 b\u00fcy\u00fck-k\u00fc\u00e7\u00fck harf yaz\u0131m\u0131) birle\u015ftirme i\u015flemini etkileyebilir.  Veri temizli\u011fi ve normalizasyonu \u00f6nemlidir.<br \/>\n* <strong>\u00c7oklu e\u015fle\u015fmeler:<\/strong> Bir m\u00fc\u015fterinin birden fazla sipari\u015fi olabilir.  Bu durumda, <code class=\"language-\">GROUP BY<\/code> ve toplama fonksiyonlar\u0131 kullanarak verileri \u00f6zetleyebilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Farkl\u0131 S\u00fctunlu Tablo Birle\u015ftirme: Ger\u00e7ek D\u00fcnya Senaryolar\u0131<\/strong><\/p>\n<p><strong>Vaka Analizi 1: E-ticaret Sitesi<\/strong><\/p>\n<p>Bir e-ticaret sitesi d\u00fc\u015f\u00fcn\u00fcn.  \u00dcr\u00fcnler ve m\u00fc\u015fteriler i\u00e7in ayr\u0131 tablolar var.  Her \u00fcr\u00fcn\u00fcn kategorisi ve m\u00fc\u015fterilerin sipari\u015f ge\u00e7mi\u015fi ayr\u0131 tablolarda tutuluyor.  Bu tablolar\u0131 birle\u015ftirerek, her m\u00fc\u015fterinin hangi kategoride ka\u00e7 \u00fcr\u00fcn sipari\u015f etti\u011fini analiz edebiliriz.  Bu analiz, pazarlama stratejilerini iyile\u015ftirmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Vaka Analizi 2: Sosyal Medya Platformu<\/strong><\/p>\n<p>Bir sosyal medya platformunda, kullan\u0131c\u0131lar ve g\u00f6nderiler ayr\u0131 tablolarda tutulur.  Her g\u00f6nderinin yorumlar\u0131 da ayr\u0131 bir tabloda saklan\u0131r.  Bu tablolar\u0131 birle\u015ftirerek, her kullan\u0131c\u0131n\u0131n yapt\u0131\u011f\u0131 yorum say\u0131s\u0131n\u0131 veya ald\u0131\u011f\u0131 be\u011feni say\u0131s\u0131n\u0131 analiz edebiliriz.  Bu analiz, platformun kullan\u0131c\u0131 etkile\u015fimini anlamak i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de farkl\u0131 s\u00fctunlu iki tabloyu birle\u015ftirmek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler vard\u0131r.  En uygun y\u00f6ntem, tablolar\u0131n yap\u0131s\u0131na ve sorgu gereksinimlerine ba\u011fl\u0131d\u0131r.  Bu makalede ele al\u0131nan y\u00f6ntemleri ve optimizasyon ipu\u00e7lar\u0131n\u0131 kullanarak, verilerinizi verimli bir \u015fekilde birle\u015ftirebilir ve anlaml\u0131 analizler yapabilirsiniz.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ve indeksleme, b\u00fcy\u00fck veritabanlar\u0131nda performans\u0131 optimize etmede kritik rol oynar.  Veri tutars\u0131zl\u0131klar\u0131na ve \u00e7oklu e\u015fle\u015fmelere dikkat ederek, do\u011fru ve g\u00fcvenilir sonu\u00e7lar elde edebilirsiniz. Daha detayl\u0131 bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n bloguna](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">FULL OUTER JOIN<\/code> ne zaman kullan\u0131l\u0131r?<\/strong>  Hem sol hem de sa\u011f tablodaki t\u00fcm sat\u0131rlar\u0131 g\u00f6rmek istedi\u011finizde kullan\u0131l\u0131r.<br \/>\n2. <strong>Birle\u015ftirme i\u015flemlerini optimize etmek i\u00e7in neler yap\u0131labilir?<\/strong> \u0130ndeksler eklemek, <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131 kullanmak ve <code class=\"language-\">EXPLAIN ANALYZE<\/code> kullanarak sorgu plan\u0131n\u0131 analiz etmek.<br \/>\n3. <strong>\u00c7oklu e\u015fle\u015fmeler nas\u0131l ele al\u0131n\u0131r?<\/strong> <code class=\"language-\">GROUP BY<\/code> ve toplama fonksiyonlar\u0131 kullan\u0131larak.<br \/>\n4. <strong>Veri tutars\u0131zl\u0131klar\u0131 nas\u0131l \u00f6nlenir?<\/strong> Veri temizli\u011fi ve normalizasyon i\u015flemleriyle.<br \/>\n5. <strong><code class=\"language-\">LEFT JOIN<\/code> ve <code class=\"language-\">RIGHT JOIN<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">LEFT JOIN<\/code> sol tablodaki t\u00fcm sat\u0131rlar\u0131 i\u00e7erirken, <code class=\"language-\">RIGHT JOIN<\/code> sa\u011f tablodaki t\u00fcm sat\u0131rlar\u0131 i\u00e7erir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Farkl\u0131 S\u00fctunlu \u0130ki Tabloyu Birle\u015ftirme PostgreSQL veritaban\u0131n\u0131zda iki farkl\u0131 tablo var ve bu tablolar\u0131 birle\u015ftirerek tek&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[644],"tags":[],"class_list":{"0":"post-25532","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-postgresql","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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