{"id":25628,"date":"2025-07-10T00:15:24","date_gmt":"2025-07-09T21:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-tablodaki-yinelenen-satirlari-sayma\/"},"modified":"2025-07-10T00:15:24","modified_gmt":"2025-07-09T21:15:24","slug":"postgresql-tablodaki-yinelenen-satirlari-sayma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-tablodaki-yinelenen-satirlari-sayma\/","title":{"rendered":"PostgreSQL: Tablodaki Yinelenen Sat\u0131rlar\u0131 Sayma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Yinelenen Sat\u0131rlar\u0131 Sayma: Tam Bir Rehber<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda ayn\u0131 verileri i\u00e7eren birden fazla sat\u0131r var m\u0131? Bu durum veritaban\u0131n\u0131z\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve performans\u0131n\u0131 olumsuz etkileyebilir. Bu makalede, PostgreSQL&#8217;de yinelenen sat\u0131rlar\u0131 nas\u0131l sayaca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m, ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar detayl\u0131 bir \u015fekilde \u00f6\u011freneceksiniz. Ger\u00e7ek d\u00fcnya \u00f6rnekleri, performans optimizasyonu ipu\u00e7lar\u0131 ve olas\u0131 sorunlar ile kar\u015f\u0131la\u015faca\u011f\u0131n\u0131z karma\u015f\u0131k durumlar\u0131 ele alaca\u011f\u0131z.  PostgreSQL&#8217;de yinelenen verilerin tespiti ve say\u0131m\u0131 i\u00e7in \u00e7e\u015fitli y\u00f6ntemler ke\u015ffedecek, performansl\u0131 sorgular yazmay\u0131 \u00f6\u011frenecek ve veritaban\u0131n\u0131z\u0131n sa\u011fl\u0131\u011f\u0131n\u0131 koruman\u0131n yollar\u0131n\u0131 g\u00f6receksiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Yinelenen Sat\u0131rlar\u0131 Nas\u0131l Sayar\u0131m? (Yeni Ba\u015flayanlar i\u00e7in)<\/strong><\/p>\n<p>\u00d6ncelikle, temel kavramlar\u0131 anlayal\u0131m. Yinelenen sat\u0131rlar, ayn\u0131 s\u00fctun de\u011ferlerine sahip birden fazla sat\u0131rd\u0131r.  \u00d6rne\u011fin, bir &#8220;m\u00fc\u015fteriler&#8221; tablosunda ayn\u0131 isim ve soyisime sahip iki farkl\u0131 m\u00fc\u015fteri kayd\u0131 yinelenen bir sat\u0131rd\u0131r.  Bu yinelenen sat\u0131rlar\u0131n say\u0131s\u0131n\u0131 bilmek, veritaban\u0131n\u0131z\u0131 temizlemek ve tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamak i\u00e7in \u00f6nemlidir.<\/p>\n<p><strong>Ad\u0131m ad\u0131m a\u00e7\u0131klama:<\/strong><\/p>\n<p>En basit y\u00f6ntem, <code class=\"language-\">COUNT(*)<\/code> fonksiyonunu ve <code class=\"language-\">GROUP BY<\/code> c\u00fcmlesini kullanmakt\u0131r.  T\u00fcm s\u00fctunlar\u0131 gruplayarak, her benzersiz sat\u0131r kombinasyonunun ka\u00e7 kez tekrar etti\u011fini sayabiliriz.<\/p>\n<p><strong>Basit kod \u00f6rne\u011fi:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki \u00f6rnekte, &#8220;urunler&#8221; adl\u0131 bir tablomuz oldu\u011funu ve bu tablonun &#8220;urun_adi&#8221; ve &#8220;fiyat&#8221; s\u00fctunlar\u0131n\u0131 i\u00e7erdi\u011fini varsayal\u0131m. Yinelenen \u00fcr\u00fcn adlar\u0131n\u0131 ve fiyatlar\u0131n\u0131 saymak i\u00e7in \u015fu sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat, COUNT(*) AS yinelenen_sayisi\nFROM urunler\nGROUP BY urun_adi, fiyat\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_adi<\/code> ve <code class=\"language-\">fiyat<\/code> s\u00fctunlar\u0131na g\u00f6re grupland\u0131rma yapar ve her gruptaki sat\u0131r say\u0131s\u0131n\u0131 <code class=\"language-\">yinelenen_sayisi<\/code> olarak g\u00f6sterir. <code class=\"language-\">HAVING COUNT(*) > 1<\/code> ko\u015fulu ise sadece yinelenen sat\u0131rlar\u0131 (say\u0131s\u0131 1&#8217;den fazla olan gruplar\u0131) g\u00f6sterir.  Yinelenen sat\u0131rlar\u0131n toplam say\u0131s\u0131n\u0131 bulmak i\u00e7in ise <code class=\"language-\">COUNT(*)<\/code> fonksiyonunu d\u0131\u015far\u0131da kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT COUNT(*) AS toplam_yinelenen_sayisi\nFROM (\n    SELECT urun_adi, fiyat, COUNT(*)\n    FROM urunler\n    GROUP BY urun_adi, fiyat\n    HAVING COUNT(*) &gt; 1\n) AS yinelenenler;<\/code><\/pre>\n<p><strong>Ger\u00e7ek Hayatta Yinelenen Sat\u0131rlar\u0131 Nas\u0131l Tespit Ederim? (Orta Seviye)<\/strong><\/p>\n<p>\u015eimdi, daha ger\u00e7ek\u00e7i bir senaryo ele alal\u0131m. Bir e-ticaret sitesinin m\u00fc\u015fteri sipari\u015flerini tuttu\u011fu bir tablo d\u00fc\u015f\u00fcnelim.  Bu tabloda, ayn\u0131 m\u00fc\u015fteri taraf\u0131ndan ayn\u0131 \u00fcr\u00fcn\u00fcn birden fazla kez sipari\u015f edildi\u011fi durumlar olabilir.  Bu yinelenen sipari\u015fleri nas\u0131l tespit eder ve sayar\u0131z?<\/p>\n<p><strong>Ger\u00e7ek hayat \u00f6rne\u011fi:<\/strong><\/p>\n<p>&#8220;siparisler&#8221; adl\u0131 bir tablomuz olsun. Bu tabloda <code class=\"language-\">musteri_id<\/code>, <code class=\"language-\">urun_id<\/code>, <code class=\"language-\">siparis_tarihi<\/code> gibi s\u00fctunlar bulunmaktad\u0131r.  Ayn\u0131 m\u00fc\u015fterinin ayn\u0131 \u00fcr\u00fcn\u00fc birden fazla sipari\u015f etti\u011fini bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT musteri_id, urun_id, COUNT(*) AS siparis_sayisi\nFROM siparisler\nGROUP BY musteri_id, urun_id\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>Bu sorgu, her m\u00fc\u015fteri-\u00fcr\u00fcn kombinasyonunu gruplar ve her kombinasyon i\u00e7in sipari\u015f say\u0131s\u0131n\u0131 g\u00f6sterir. <code class=\"language-\">HAVING COUNT(*) > 1<\/code> ko\u015fulu, ayn\u0131 m\u00fc\u015fteri taraf\u0131ndan ayn\u0131 \u00fcr\u00fcn\u00fcn birden fazla sipari\u015f edildi\u011fi durumlar\u0131 filtreler.<\/p>\n<p><strong>Optimizasyon ipu\u00e7lar\u0131:<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong> <code class=\"language-\">musteri_id<\/code> ve <code class=\"language-\">urun_id<\/code> s\u00fctunlar\u0131na indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.<br \/>\n* <strong>Sadece gerekli s\u00fctunlar\u0131 se\u00e7in:<\/strong> Gereksiz s\u00fctunlar\u0131 se\u00e7mek sorguyu yava\u015flatabilir.  Sadece gerekli s\u00fctunlar\u0131 se\u00e7ti\u011finizden emin olun.<br \/>\n* <strong>WHERE ko\u015fulu:<\/strong>  E\u011fer belirli bir tarih aral\u0131\u011f\u0131ndaki sipari\u015fleri kontrol etmek istiyorsan\u0131z, <code class=\"language-\">WHERE<\/code> c\u00fcmlesi kullanarak sorguyu daha da optimize edebilirsiniz. \u00d6rne\u011fin: <code class=\"language-\">WHERE siparis_tarihi BETWEEN '2023-10-01' AND '2023-10-31'<\/code><\/p>\n<p><strong>Yinelenen Sat\u0131rlar\u0131 Sayarken Performans Analizi (\u0130leri D\u00fczey)<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck tablolarda yinelenen sat\u0131rlar\u0131 saymak zaman alabilir.  Performans\u0131 etkileyen fakt\u00f6rleri anlamak ve optimize etmek \u00f6nemlidir.<\/p>\n<p><strong>Performans analizi:<\/strong><\/p>\n<p>* <strong>Tablo boyutu:<\/strong> Tablonun boyutu, sorgu s\u00fcresini do\u011frudan etkiler.  B\u00fcy\u00fck tablolarda, sorguyu optimize etmek daha \u00f6nemli hale gelir.<br \/>\n* <strong>\u0130ndeksler:<\/strong> Uygun indeksler, veritaban\u0131n\u0131n do\u011fru sat\u0131rlar\u0131 daha h\u0131zl\u0131 bulmas\u0131na yard\u0131mc\u0131 olur.  <code class=\"language-\">GROUP BY<\/code> c\u00fcmlesinde kullan\u0131lan s\u00fctunlara indeks eklemek performans\u0131 art\u0131r\u0131r.<br \/>\n* <strong>Sorgu plan\u0131:<\/strong> PostgreSQL&#8217;in sorguyu nas\u0131l y\u00fcr\u00fctece\u011fini anlamak i\u00e7in <code class=\"language-\">EXPLAIN<\/code> komutunu kullanabilirsiniz.  Sorgu plan\u0131n\u0131 analiz ederek, performans\u0131 iyile\u015ftirmek i\u00e7in de\u011fi\u015fiklikler yapabilirsiniz.<\/p>\n<p><strong>Edge caseler:<\/strong><\/p>\n<p>* <strong>NULL de\u011ferleri:<\/strong> <code class=\"language-\">NULL<\/code> de\u011ferleri, <code class=\"language-\">GROUP BY<\/code> c\u00fcmlesi taraf\u0131ndan farkl\u0131 \u015fekilde ele al\u0131nabilir.  <code class=\"language-\">NULL<\/code> de\u011ferlerinin nas\u0131l ele al\u0131naca\u011f\u0131n\u0131 anlamak \u00f6nemlidir.  <code class=\"language-\">IS NULL<\/code> veya <code class=\"language-\">IS NOT NULL<\/code> gibi ko\u015fullar kullanarak NULL de\u011ferlerini do\u011fru \u015fekilde i\u015fleyebilirsiniz.<br \/>\n* <strong>Veri tipi uyumsuzlu\u011fu:<\/strong> Farkl\u0131 veri tiplerindeki s\u00fctunlar\u0131 kar\u015f\u0131la\u015ft\u0131r\u0131rken dikkatli olun.  Veri tipi uyumsuzlu\u011fu beklenmedik sonu\u00e7lara yol a\u00e7abilir.<\/p>\n<p><strong>PostgreSQL&#8217;de Yinelenen Sat\u0131rlar\u0131 Silme<\/strong><\/p>\n<p>Yinelenen sat\u0131rlar\u0131 sayd\u0131ktan sonra, bunlar\u0131 veritaban\u0131ndan silmek isteyebilirsiniz.  Bunun i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  En yayg\u0131n y\u00f6ntemlerden biri, <code class=\"language-\">ROW_NUMBER()<\/code> pencere fonksiyonunu kullanmakt\u0131r.  Bu fonksiyon, her sat\u0131ra s\u0131ral\u0131 bir numara atar.  Sonras\u0131nda, en d\u00fc\u015f\u00fck s\u0131ral\u0131 numaraya sahip sat\u0131rlar\u0131 koruyarak di\u011ferlerini silebilirsiniz.  Bu i\u015flem, veritaban\u0131n\u0131z\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korumak ve performans\u0131n\u0131 iyile\u015ftirmek i\u00e7in \u00f6nemlidir.  Detayl\u0131 bilgi i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesini ziyaret edebilirsiniz. (Buraya benzer bir makale veya ilgili bir ba\u011flant\u0131 eklenebilir.)<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> Yukar\u0131da verilen basit kod \u00f6rneklerini \u00e7al\u0131\u015ft\u0131r\u0131n ve farkl\u0131 tablolarda deneyin.  <code class=\"language-\">GROUP BY<\/code> ve <code class=\"language-\">HAVING<\/code> c\u00fcmlelerinin nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 anlay\u0131n.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat \u00f6rne\u011fini kendi veritaban\u0131n\u0131zdaki tablolara uyarlay\u0131n.  \u0130ndekslerin performansa etkisini g\u00f6zlemleyin.  <code class=\"language-\">WHERE<\/code> c\u00fcmlesini kullanarak sorgular\u0131 optimize edin.<\/p>\n<p><strong>\u0130leri D\u00fczey:<\/strong> <code class=\"language-\">EXPLAIN<\/code> komutunu kullanarak sorgu planlar\u0131n\u0131 analiz edin.  <code class=\"language-\">NULL<\/code> de\u011ferleri ve veri tipi uyumsuzluklar\u0131 gibi edge caseleri ele al\u0131n.  Yinelenen sat\u0131rlar\u0131 silmek i\u00e7in <code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonunu kullanmay\u0131 \u00f6\u011frenin.  Performans optimizasyonu i\u00e7in daha geli\u015fmi\u015f teknikleri ara\u015ft\u0131r\u0131n.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de yinelenen sat\u0131rlar\u0131 saymak ve y\u00f6netmek, veritaban\u0131n\u0131z\u0131n sa\u011fl\u0131\u011f\u0131 ve performans\u0131 i\u00e7in \u00f6nemlidir.  Bu makalede, farkl\u0131 y\u00f6ntemleri, optimizasyon ipu\u00e7lar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ele ald\u0131k.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar kademeli bir \u00f6\u011frenme yol haritas\u0131 sunarak, okuyucunun konuyu tam olarak anlamas\u0131n\u0131 sa\u011flad\u0131k. Unutmay\u0131n ki veritaban\u0131n\u0131z\u0131n b\u00fcy\u00fckl\u00fc\u011f\u00fc ve yap\u0131s\u0131, en uygun y\u00f6ntemin se\u00e7imini etkileyebilir.  Do\u011fru yakla\u015f\u0131m\u0131 belirlemek i\u00e7in her zaman veritaban\u0131n\u0131z\u0131n \u00f6zel durumunu g\u00f6z \u00f6n\u00fcnde bulundurman\u0131z gerekir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Yinelenen sat\u0131rlar\u0131 silmek veritaban\u0131m\u0131 bozabilir mi?<\/strong>  Evet, yanl\u0131\u015f bir \u015fekilde uygulan\u0131rsa veritaban\u0131n\u0131zda veri kayb\u0131na yol a\u00e7abilir.  Silme i\u015flemini ger\u00e7ekle\u015ftirmeden \u00f6nce mutlaka yedekleme al\u0131n ve i\u015flemi test ortam\u0131nda deneyin.<br \/>\n2. <strong>Hangi s\u00fctunlar\u0131 <code class=\"language-\">GROUP BY<\/code> c\u00fcmlesinde kullanmal\u0131y\u0131m?<\/strong>  Yinelenen sat\u0131rlar\u0131 tan\u0131mlayan t\u00fcm s\u00fctunlar\u0131 kullanmal\u0131s\u0131n\u0131z.<br \/>\n3. <strong>\u0130ndeksler performans\u0131 nas\u0131l etkiler?<\/strong>  Uygun indeksler, veritaban\u0131n\u0131n do\u011fru sat\u0131rlar\u0131 daha h\u0131zl\u0131 bulmas\u0131na yard\u0131mc\u0131 olur, bu da sorgu s\u00fcresini k\u0131salt\u0131r.<br \/>\n4. <strong><code class=\"language-\">EXPLAIN<\/code> komutu ne i\u015fe yarar?<\/strong>  <code class=\"language-\">EXPLAIN<\/code> komutu, PostgreSQL&#8217;in sorguyu nas\u0131l y\u00fcr\u00fctece\u011fini g\u00f6sterir.  Bu bilgi, sorguyu optimize etmek i\u00e7in kullan\u0131labilir.<br \/>\n5. <strong>\u00c7ok b\u00fcy\u00fck tablolarda yinelenen sat\u0131rlar\u0131 sayman\u0131n daha etkili yollar\u0131 var m\u0131?<\/strong>  Evet, daha geli\u015fmi\u015f teknikler ve ara\u00e7lar kullan\u0131labilir.  \u00d6rne\u011fin, paralel i\u015fleme veya d\u0131\u015f birle\u015ftirme gibi y\u00f6ntemler performans\u0131 art\u0131rabilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Yinelenen Sat\u0131rlar\u0131 Sayma: Tam Bir Rehber PostgreSQL veritaban\u0131n\u0131zda ayn\u0131 verileri i\u00e7eren birden fazla sat\u0131r var m\u0131?&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-25628","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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