{"id":27592,"date":"2025-08-16T06:15:23","date_gmt":"2025-08-16T03:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/"},"modified":"2025-08-16T06:15:23","modified_gmt":"2025-08-16T03:15:23","slug":"postgresqlde-tabloda-yinelenen-kayitlari-bulma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/","title":{"rendered":"PostgreSQL&#8217;de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Yinelenen Kay\u0131tlar\u0131 Bulma: Tam Bir Rehber<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda yinelenen kay\u0131tlar m\u0131 var?  Bu durum, veritaban\u0131n\u0131z\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc bozabilir, yanl\u0131\u015f analizlere yol a\u00e7abilir ve performans sorunlar\u0131na neden olabilir.  Bu kapsaml\u0131 rehberde, PostgreSQL&#8217;de yinelenen kay\u0131tlar\u0131 nas\u0131l tespit edece\u011finizi, farkl\u0131 y\u00f6ntemleri ve performans optimizasyon tekniklerini ad\u0131m ad\u0131m \u00f6\u011freneceksiniz.  Veritaban\u0131n\u0131z\u0131n sa\u011fl\u0131\u011f\u0131n\u0131 korumak ve verimlili\u011fini art\u0131rmak i\u00e7in bu rehberi dikkatlice inceleyin.<\/p>\n<p><strong>PostgreSQL&#8217;de Yinelenen Kay\u0131tlar\u0131 Nas\u0131l Buluruz?  \u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, PostgreSQL&#8217;de yinelenen kay\u0131tlar\u0131 bulma konusunda yeni ba\u015flayanlardan ileri d\u00fczey kullan\u0131c\u0131lara kadar herkese hitap edecek \u015fekilde tasarlanm\u0131\u015ft\u0131r.  A\u015fa\u011f\u0131daki \u00f6\u011frenme yol haritas\u0131n\u0131 takip ederek, konuyu ad\u0131m ad\u0131m kavrayabilirsiniz.<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Basit bir tabloda yinelenen kay\u0131tlar\u0131 tespit etme. Basit <code class=\"language-\">GROUP BY<\/code> ve <code class=\"language-\">HAVING<\/code> kullan\u0131m\u0131.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, daha karma\u015f\u0131k sorgular, performans optimizasyonu ipu\u00e7lar\u0131 ve indeks kullan\u0131m\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in optimizasyon stratejileri, edge case&#8217;ler ve farkl\u0131 veri tipleri i\u00e7in \u00e7\u00f6z\u00fcmler.<\/p>\n<p><strong>Temel Kavramlar: PostgreSQL ve Yinelenen Kay\u0131tlar<\/strong><\/p>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc ve pop\u00fcler bir a\u00e7\u0131k kaynak ili\u015fkisel veritaban\u0131 y\u00f6netim sistemidir.  Veri b\u00fct\u00fcnl\u00fc\u011f\u00fc, veritaban\u0131 y\u00f6netiminin temel ta\u015flar\u0131ndan biridir. Yinelenen kay\u0131tlar, veritaban\u0131n\u0131zda ayn\u0131 bilgileri i\u00e7eren birden fazla sat\u0131r\u0131 ifade eder. Bu durum, veri tutars\u0131zl\u0131\u011f\u0131na, yanl\u0131\u015f analiz sonu\u00e7lar\u0131na ve gereksiz depolama alan\u0131n\u0131n kullan\u0131lmas\u0131na yol a\u00e7ar.  \u00d6rne\u011fin, bir m\u00fc\u015fteri tablosunda ayn\u0131 TC Kimlik Numaras\u0131yla birden fazla kay\u0131t bulunmas\u0131 bir yinelenen kay\u0131t \u00f6rne\u011fidir.<\/p>\n<p><strong>Yinelenen Kay\u0131tlar\u0131 Bulma: Ad\u0131m Ad\u0131m Uygulamal\u0131 K\u0131lavuz (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>\u00d6ncelikle basit bir \u00f6rnek \u00fczerinde \u00e7al\u0131\u015fal\u0131m.  <code class=\"language-\">musteriler<\/code> ad\u0131nda bir tablomuz olsun ve bu tabloda <code class=\"language-\">tc_kimlik<\/code>, <code class=\"language-\">ad<\/code>, <code class=\"language-\">soyad<\/code> s\u00fctunlar\u0131 bulunsun.  A\u015fa\u011f\u0131daki sorgu, <code class=\"language-\">tc_kimlik<\/code> s\u00fctununda yinelenen kay\u0131tlar\u0131 bulmam\u0131za yard\u0131mc\u0131 olur:<\/p>\n<pre class=\"language-sql\"><code>SELECT tc_kimlik, COUNT(*)\nFROM musteriler\nGROUP BY tc_kimlik\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">tc_kimlik<\/code> s\u00fctununa g\u00f6re grupland\u0131rma yapar ve her grubun sat\u0131r say\u0131s\u0131n\u0131 (<code class=\"language-\">COUNT(*)<\/code>) hesaplar.  <code class=\"language-\">HAVING COUNT(*) > 1<\/code> ko\u015fulu ise, birden fazla sat\u0131r\u0131 olan gruplar\u0131 (yani yinelenen <code class=\"language-\">tc_kimlik<\/code> de\u011ferlerine sahip gruplar\u0131) filtreler.  Sonu\u00e7 olarak, yinelenen TC Kimlik numaralar\u0131 ve her birinin ka\u00e7 kez tekrar etti\u011fini g\u00f6steren bir tablo elde ederiz.<\/p>\n<p><strong>\u00d6rnek:<\/strong>  E\u011fer tablomuzda 12345678900 numaral\u0131 TC Kimlik numaras\u0131 3 kez tekrar ediyorsa, sorgu sonucunda 12345678900 ve 3 de\u011ferlerini g\u00f6r\u00fcr\u00fcz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131 ve Optimizasyon \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>\u015eimdi, daha ger\u00e7ek\u00e7i bir senaryo ele alal\u0131m.  Bir e-ticaret sitesinin \u00fcr\u00fcn tablosunda, ayn\u0131 \u00fcr\u00fcn\u00fcn farkl\u0131 varyasyonlar\u0131 (\u00f6rne\u011fin, farkl\u0131 renk veya boyut) farkl\u0131 kay\u0131tlar olarak tutuluyor olabilir.  Ancak, \u00fcr\u00fcn\u00fcn temel \u00f6zelliklerini (\u00fcr\u00fcn ad\u0131, marka vb.) kar\u015f\u0131la\u015ft\u0131rarak yinelenen kay\u0131tlar\u0131 tespit etmek isteyebiliriz.<\/p>\n<p>Bu durumda, a\u015fa\u011f\u0131daki gibi bir sorgu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, marka, COUNT(*)\nFROM urunler\nGROUP BY urun_adi, marka\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_adi<\/code> ve <code class=\"language-\">marka<\/code> s\u00fctunlar\u0131na g\u00f6re grupland\u0131rma yaparak, ayn\u0131 ad\u0131 ve markaya sahip \u00fcr\u00fcnleri bulur.  <code class=\"language-\">HAVING<\/code> ko\u015fulu ise, birden fazla sat\u0131r\u0131 olan gruplar\u0131 filtreler.<\/p>\n<p><strong>Performans Optimizasyonu:<\/strong>  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in bu sorgular yava\u015f olabilir.  Performans\u0131 art\u0131rmak i\u00e7in, <code class=\"language-\">urun_adi<\/code> ve <code class=\"language-\">marka<\/code> s\u00fctunlar\u0131na indeks eklemek faydal\u0131 olacakt\u0131r.  \u0130ndeksler, veritaban\u0131n\u0131n ilgili s\u00fctunlar\u0131 daha h\u0131zl\u0131 aramas\u0131n\u0131 sa\u011flar.  \u0130ndeks eklemek i\u00e7in a\u015fa\u011f\u0131daki komutu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_urunler_urun_adi_marka ON urunler (urun_adi, marka);<\/code><\/pre>\n<p><strong>\u0130leri D\u00fczey Teknikler: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck tablolar i\u00e7in yukar\u0131daki y\u00f6ntemler yetersiz kalabilir.  Bu durumlarda, daha geli\u015fmi\u015f teknikler kullanmak gerekebilir.  \u00d6rne\u011fin, <code class=\"language-\">DISTINCT ON<\/code> kullanarak yinelenen kay\u0131tlar\u0131n ilkini veya sonuncusunu se\u00e7ebilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT DISTINCT ON (urun_adi, marka) *\nFROM urunler\nORDER BY urun_adi, marka, urun_id;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_adi<\/code> ve <code class=\"language-\">marka<\/code> s\u00fctunlar\u0131na g\u00f6re benzersiz kay\u0131tlar\u0131 se\u00e7er ve <code class=\"language-\">urun_id<\/code> s\u00fctununa g\u00f6re s\u0131ralar.  <code class=\"language-\">DISTINCT ON<\/code> ifadesi, her benzersiz <code class=\"language-\">(urun_adi, marka)<\/code> kombinasyonu i\u00e7in sadece ilk kayd\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Performans Analizi:<\/strong>  Sorgular\u0131n\u0131z\u0131n performans\u0131n\u0131 <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile analiz edebilirsiniz. Bu komut, sorgunun nas\u0131l y\u00fcr\u00fct\u00fcld\u00fc\u011f\u00fcn\u00fc ve hangi a\u015famalar\u0131n ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc g\u00f6sterir.  Bu bilgiler, sorgular\u0131n\u0131z\u0131 optimize etmek i\u00e7in size yard\u0131mc\u0131 olur.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>EXPLAIN ANALYZE\nSELECT urun_adi, marka, COUNT(*)\nFROM urunler\nGROUP BY urun_adi, marka\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p><strong>Edge Case&#8217;ler:<\/strong>  Yinelenen kay\u0131tlar\u0131 tespit ederken, farkl\u0131 veri tipleri ve bo\u015f de\u011ferler gibi durumlar\u0131 da g\u00f6z \u00f6n\u00fcnde bulundurmak \u00f6nemlidir.  Bo\u015f de\u011ferleri nas\u0131l ele alaca\u011f\u0131n\u0131z\u0131 belirlemek ve sorgular\u0131n\u0131z\u0131 buna g\u00f6re ayarlaman\u0131z gerekebilir.  \u00d6rne\u011fin, <code class=\"language-\">NULL<\/code> de\u011ferlerini \u00f6zel olarak ele almak i\u00e7in <code class=\"language-\">IS NULL<\/code> veya <code class=\"language-\">IS NOT NULL<\/code> ko\u015fullar\u0131n\u0131 kullanabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Yinelenen Kay\u0131tlar\u0131 Silme<\/strong><\/p>\n<p>Yinelenen kay\u0131tlar\u0131 bulduktan sonra, bunlar\u0131 silmek isteyebilirsiniz.  Ancak, hangi kayd\u0131 silece\u011finizi dikkatlice se\u00e7melisiniz.  \u00d6rne\u011fin, en eski kayd\u0131 veya en yeni kayd\u0131 silebilirsiniz.  A\u015fa\u011f\u0131daki \u00f6rnekte, <code class=\"language-\">urun_id<\/code> s\u00fctununa g\u00f6re en d\u00fc\u015f\u00fck <code class=\"language-\">id<\/code> de\u011ferine sahip yinelenen kay\u0131tlar hari\u00e7 di\u011ferleri silinir:<\/p>\n<pre class=\"language-sql\"><code>WITH duplicate_rows AS (\n    SELECT urun_id, ROW_NUMBER() OVER (PARTITION BY urun_adi, marka ORDER BY urun_id) as rn\n    FROM urunler\n)\nDELETE FROM urunler\nWHERE urun_id IN (SELECT urun_id FROM duplicate_rows WHERE rn &gt; 1);<\/code><\/pre>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de yinelenen kay\u0131tlar\u0131 tespit etmek ve y\u00f6netmek, veritaban\u0131n\u0131z\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fc ve performans\u0131 i\u00e7in hayati \u00f6nem ta\u015f\u0131r.  Bu rehberde, farkl\u0131 y\u00f6ntemleri ve performans optimizasyon tekniklerini \u00f6\u011frendiniz.  Hangi y\u00f6ntemi kullanaca\u011f\u0131n\u0131z, veritaban\u0131n\u0131z\u0131n boyutuna, verinin yap\u0131s\u0131na ve performans gereksinimlerinize ba\u011fl\u0131d\u0131r.  Unutmay\u0131n ki, veritaban\u0131n\u0131zda de\u011fi\u015fiklik yapmadan \u00f6nce yedekleme alman\u0131z \u00f6nemlidir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Yinelenen kay\u0131tlar\u0131 bulmak i\u00e7in hangi indeksler en etkilidir?<\/strong>  Yinelenen kay\u0131tlar\u0131 bulmak i\u00e7in, yinelenen de\u011ferleri i\u00e7eren s\u00fctunlara indeks eklemek performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n2. <strong>\u00c7ok b\u00fcy\u00fck tablolar i\u00e7in hangi y\u00f6ntemler daha uygundur?<\/strong>  \u00c7ok b\u00fcy\u00fck tablolar i\u00e7in <code class=\"language-\">DISTINCT ON<\/code> veya par\u00e7al\u0131 sorgular daha uygun olabilir.<br \/>\n3. <strong>Yinelenen kay\u0131tlar\u0131 sildikten sonra veritaban\u0131n\u0131 nas\u0131l do\u011frulayabilirim?<\/strong>  Yinelenen kay\u0131tlar\u0131 sildikten sonra, benzer sorgular \u00e7al\u0131\u015ft\u0131rarak veya veritaban\u0131n\u0131 manuel olarak inceleyerek do\u011frulamay\u0131 yapabilirsiniz.<br \/>\n4. <strong><code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonu nedir?<\/strong>  <code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonu, bir grup i\u00e7indeki her sat\u0131ra s\u0131ral\u0131 bir numara atar.<br \/>\n5. <strong>Performans sorunlar\u0131yla kar\u015f\u0131la\u015f\u0131rsam ne yapmal\u0131y\u0131m?<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgular\u0131n\u0131z\u0131 analiz edin ve indeksleme stratejilerinizi g\u00f6zden ge\u00e7irin.  Gerekirse, daha geli\u015fmi\u015f optimizasyon tekniklerini ara\u015ft\u0131r\u0131n.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Yinelenen Kay\u0131tlar\u0131 Bulma: Tam Bir Rehber PostgreSQL veritaban\u0131n\u0131zda yinelenen kay\u0131tlar m\u0131 var? Bu durum, veritaban\u0131n\u0131z\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc&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-27592","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PostgreSQL&#039;de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL&#039;de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-16T03:15:23+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL&#8217;de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma\",\"datePublished\":\"2025-08-16T03:15:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\"},\"wordCount\":1018,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"articleSection\":[\"PostgreSQL\"],\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\",\"name\":\"PostgreSQL'de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-08-16T03:15:23+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-tabloda-yinelenen-kayitlari-bulma\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL&#8217;de Tabloda Yinelenen Kay\u0131tlar\u0131 Bulma\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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