{"id":26667,"date":"2025-07-28T21:17:43","date_gmt":"2025-07-28T18:17:43","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-diziden-belirli-bir-degeri-silme\/"},"modified":"2025-07-28T21:17:43","modified_gmt":"2025-07-28T18:17:43","slug":"postgresql-diziden-belirli-bir-degeri-silme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-diziden-belirli-bir-degeri-silme\/","title":{"rendered":"PostgreSQL: Diziden Belirli Bir De\u011feri Silme"},"content":{"rendered":"<p># PostgreSQL&#8217;den Dizi Eleman\u0131n\u0131 Silmenin 7 Yolu<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda dizi tipinde veriler sakl\u0131yor ve bu dizilerden belirli de\u011ferleri silmeniz mi gerekiyor?  Bu makale, PostgreSQL&#8217;de dizi elemanlar\u0131n\u0131 silmenin farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ad\u0131m ad\u0131m a\u00e7\u0131klayarak, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkese rehberlik edecektir.  PostgreSQL dizi i\u015flemlerinin inceliklerini kavrayarak, veritaban\u0131 y\u00f6netiminizde daha verimli ve g\u00fc\u00e7l\u00fc olacaks\u0131n\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de dizi elemanlar\u0131n\u0131 silme konusunda \u00fc\u00e7 farkl\u0131 seviyede bilgi sunmaktad\u0131r:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel fonksiyonlar ve basit \u00f6rnekler ile ad\u0131m ad\u0131m anlat\u0131m.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, optimizasyon ipu\u00e7lar\u0131 ve daha karma\u015f\u0131k sorgulamalar.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, s\u0131n\u0131r durumlar\u0131 (edge cases) ve geli\u015fmi\u015f teknikler.<\/p>\n<p><strong>PostgreSQL Dizileri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, veritaban\u0131nda birden fazla de\u011feri tek bir s\u00fctunda saklamak i\u00e7in dizi veri tipini destekler.  Diziler, virg\u00fclle ayr\u0131lm\u0131\u015f de\u011ferler k\u00fcmesidir ve <code class=\"language-\">{}<\/code> (k\u00fcme parantezleri) ile \u00e7evrilir. \u00d6rne\u011fin, <code class=\"language-\">{1, 2, 3, 4}<\/code>  d\u00f6rt elemanl\u0131 bir tamsay\u0131 dizisidir.  Diziler, farkl\u0131 veri tiplerini (tamsay\u0131, metin, tarih vb.) i\u00e7erebilir ancak ayn\u0131 dizi i\u00e7indeki t\u00fcm elemanlar ayn\u0131 veri tipinde olmal\u0131d\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;den Dizi Eleman\u0131n\u0131 Silme: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p>PostgreSQL&#8217;de bir diziden belirli bir de\u011feri silmenin birka\u00e7 yolu vard\u0131r.  En yayg\u0131n y\u00f6ntemler <code class=\"language-\">array_remove<\/code> fonksiyonu ve <code class=\"language-\">unnest<\/code> ile birlikte <code class=\"language-\">array_agg<\/code> fonksiyonunun kullan\u0131m\u0131d\u0131r.<\/p>\n<p><strong># 1. <code class=\"language-\">array_remove<\/code> Fonksiyonu ile Dizi Eleman\u0131 Silme (Yeni Ba\u015flayan)<\/strong><\/p>\n<p><code class=\"language-\">array_remove<\/code> fonksiyonu, bir diziden belirtilen bir de\u011ferin t\u00fcm \u00f6rneklerini kald\u0131r\u0131r.  Fonksiyon, yaln\u0131zca ilk kar\u015f\u0131la\u015ft\u0131\u011f\u0131 de\u011feri de\u011fil, t\u00fcm e\u015fle\u015fmeleri siler.<\/p>\n<p><strong>\u00d6rnek:<\/strong><\/p>\n<pre class=\"language-sql\"><code>SELECT array_remove('{1, 2, 3, 2, 4}', 2); -- Sonu\u00e7: {1, 3, 4}<\/code><\/pre>\n<p>Bu basit \u00f6rnekte, <code class=\"language-\">{1, 2, 3, 2, 4}<\/code> dizisinden <code class=\"language-\">2<\/code> de\u011ferini siliyoruz.  <code class=\"language-\">array_remove<\/code> fonksiyonu, t\u00fcm <code class=\"language-\">2<\/code> de\u011ferlerini kald\u0131rarak <code class=\"language-\">{1, 3, 4}<\/code> sonucunu \u00fcretir.<\/p>\n<p><strong># 2. <code class=\"language-\">unnest<\/code> ve <code class=\"language-\">array_agg<\/code> ile Dizi Eleman\u0131 Silme (Orta Seviye)<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolarda, <code class=\"language-\">unnest<\/code> ve <code class=\"language-\">array_agg<\/code> fonksiyonlar\u0131n\u0131 kullanarak diziden belirli de\u011ferleri filtreleyerek silebiliriz.  Bu y\u00f6ntem, belirli ko\u015fullara ba\u011fl\u0131 olarak elemanlar\u0131 silmemize olanak tan\u0131r.<\/p>\n<p><strong>\u00d6rnek:<\/strong> Bir \u00fcr\u00fcn katalo\u011funda, belirli bir kategorideki \u00fcr\u00fcnleri i\u00e7eren bir dizi var ve bu diziden belirli bir \u00fcr\u00fcn\u00fc silmek istiyoruz.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE products (\n    id SERIAL PRIMARY KEY,\n    category TEXT[],\n    product_name TEXT\n);\n\nINSERT INTO products (category, product_name) VALUES\n('{elektronik, ev e\u015fyas\u0131}', 'Televizyon'),\n('{giyim, aksesuar}', 'Mont'),\n('{elektronik, ev e\u015fyas\u0131}', 'Buzdolab\u0131');\n\n\nSELECT array_agg(product)\nFROM (\n    SELECT unnest(category) as product\n    FROM products\n    WHERE id = 1\n    EXCEPT\n    SELECT 'ev e\u015fyas\u0131'\n) as subquery;\n\n-- Sonu\u00e7: {elektronik}<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code class=\"language-\">unnest<\/code> fonksiyonu <code class=\"language-\">category<\/code> dizisini tek tek elemanlara ay\u0131r\u0131r. <code class=\"language-\">EXCEPT<\/code> operat\u00f6r\u00fc ile &#8216;ev e\u015fyas\u0131&#8217; eleman\u0131n\u0131 filtreler ve kalan elemanlar <code class=\"language-\">array_agg<\/code> ile tekrar bir dizi haline getirilir.<\/p>\n<p><strong># 3.  \u0130ndeks Kullanarak Performans Optimizasyonu (Orta Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken, performans\u0131 iyile\u015ftirmek i\u00e7in indeksleme \u00f6nemlidir.  Ancak, PostgreSQL&#8217;de diziler \u00fczerinde do\u011frudan indeks olu\u015fturmak m\u00fcmk\u00fcn de\u011fildir.  Bunun yerine, dizinin elemanlar\u0131n\u0131 ayr\u0131 s\u00fctunlara ay\u0131r\u0131p bu s\u00fctunlara indeks olu\u015fturmak daha verimli bir \u00e7\u00f6z\u00fcm olabilir.  Bu, veritaban\u0131 tasar\u0131m\u0131n\u0131 etkileyebilir ve dikkatlice d\u00fc\u015f\u00fcn\u00fclmelidir.  Baz\u0131 durumlarda, <code class=\"language-\">GIN<\/code> (Generalized Inverted Index) kullanarak arama performans\u0131n\u0131 art\u0131rabilirsiniz.  Ancak, bu indeks t\u00fcr\u00fc t\u00fcm durumlar i\u00e7in uygun olmayabilir.<\/p>\n<p><strong># 4.  Fonksiyonlar Kullanarak \u00d6zelle\u015ftirilmi\u015f Silme \u0130\u015flemleri (\u0130leri Seviye)<\/strong><\/p>\n<p>Karma\u015f\u0131k silme i\u015flemleri i\u00e7in kendi fonksiyonlar\u0131n\u0131z\u0131 olu\u015fturabilirsiniz.  Bu fonksiyonlar, \u00f6zel ko\u015fullara veya algoritmalara g\u00f6re dizi elemanlar\u0131n\u0131 silebilir.<\/p>\n<p><strong>\u00d6rnek:<\/strong>  Bir diziden belirli bir aral\u0131ktaki de\u011ferleri silmek i\u00e7in bir fonksiyon:<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION remove_range(arr anyarray, min_val anyelement, max_val anyelement)\nRETURNS anyarray AS $$\nDECLARE\n  result anyarray := '{}';\nBEGIN\n  FOR i IN array_lower(arr, 1)..array_upper(arr, 1) LOOP\n    IF arr[i] &lt; min_val OR arr[i] &gt; max_val THEN\n      result := array_append(result, arr[i]);\n    END IF;\n  END LOOP;\n  RETURN result;\nEND;\n$$ LANGUAGE plpgsql;\n\nSELECT remove_range('{1, 5, 2, 8, 3, 9}', 3, 7); -- Sonu\u00e7: {1, 8, 9}<\/code><\/pre>\n<p>Bu fonksiyon, girilen dizi <code class=\"language-\">arr<\/code>&#8216;den <code class=\"language-\">min_val<\/code> ve <code class=\"language-\">max_val<\/code> aras\u0131nda olmayan de\u011ferleri yeni bir diziye ekleyerek orijinal diziden bu aral\u0131ktaki de\u011ferleri siler.<\/p>\n<p><strong># 5.  S\u0131n\u0131r Durumlar\u0131 (Edge Cases) (\u0130leri Seviye)<\/strong><\/p>\n<p>Bo\u015f diziler, null de\u011ferler ve tekrar eden de\u011ferler gibi s\u0131n\u0131r durumlar\u0131n\u0131 ele alman\u0131z \u00f6nemlidir.  <code class=\"language-\">array_remove<\/code> fonksiyonu null de\u011ferleri silmez, bo\u015f bir diziye uyguland\u0131\u011f\u0131nda bo\u015f bir dizi d\u00f6nd\u00fcr\u00fcr.  Kendi fonksiyonlar\u0131n\u0131z\u0131 olu\u015ftururken bu durumlar\u0131 kontrol etmeniz gerekir.<\/p>\n<p><strong># 6. Ger\u00e7ek D\u00fcnya Senaryosu: E-ticaret \u00dcr\u00fcn Kategorileri<\/strong><\/p>\n<p>Bir e-ticaret platformunda, \u00fcr\u00fcnlerin kategorilerini dizi olarak saklad\u0131\u011f\u0131m\u0131z\u0131 d\u00fc\u015f\u00fcnelim.  Bir \u00fcr\u00fcn\u00fcn kategorilerinden birini silmek istedi\u011fimizde, <code class=\"language-\">unnest<\/code> ve <code class=\"language-\">array_agg<\/code> y\u00f6ntemini kullanabiliriz.  \u00d6rne\u011fin, &#8220;Elektronik&#8221; kategorisindeki bir \u00fcr\u00fcnden &#8220;Televizyon&#8221; kategorisini silmek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE products SET category = array_remove(category, 'Televizyon') WHERE product_name = 'Televizyon';<\/code><\/pre>\n<p><strong># 7. Performans Analizi ve Optimizasyon (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, dizi i\u015flemlerinin performans\u0131n\u0131 analiz etmek ve optimize etmek \u00f6nemlidir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu plan\u0131n\u0131 inceleyebilir ve performans darbo\u011fazlar\u0131n\u0131 belirleyebilirsiniz.  \u0130ndeksleme, fonksiyonlar\u0131n optimizasyonu ve veritaban\u0131 tasar\u0131m\u0131n\u0131 g\u00f6zden ge\u00e7irerek performans\u0131 art\u0131rabilirsiniz.  [Fatih Soysal&#8217;\u0131n PostgreSQL performans optimizasyonu hakk\u0131ndaki yaz\u0131lar\u0131n\u0131](https:\/\/fatihsoysal.com) inceleyerek daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de dizi elemanlar\u0131n\u0131 silmenin \u00e7e\u015fitli y\u00f6ntemlerini inceledik.  <code class=\"language-\">array_remove<\/code>, <code class=\"language-\">unnest<\/code> ve <code class=\"language-\">array_agg<\/code> fonksiyonlar\u0131n\u0131n yan\u0131 s\u0131ra \u00f6zelle\u015ftirilmi\u015f fonksiyonlar kullanarak farkl\u0131 senaryolara uygun \u00e7\u00f6z\u00fcmler \u00fcretebilirsiniz.  Performans optimizasyonu i\u00e7in indeksleme ve veritaban\u0131 tasar\u0131m\u0131n\u0131 g\u00f6z \u00f6n\u00fcnde bulundurmak \u00f6nemlidir.  Do\u011fru y\u00f6ntemin se\u00e7imi, veri b\u00fcy\u00fckl\u00fc\u011f\u00fcne, karma\u015f\u0131kl\u0131k seviyesine ve performans gereksinimlerine ba\u011fl\u0131d\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">array_remove<\/code> fonksiyonu null de\u011ferleri siliyor mu?<\/strong> Hay\u0131r, <code class=\"language-\">array_remove<\/code> fonksiyonu null de\u011ferleri silmez.<br \/>\n2. <strong>Bo\u015f bir diziye <code class=\"language-\">array_remove<\/code> uygulan\u0131rsa ne olur?<\/strong> Bo\u015f bir dizi d\u00f6nd\u00fcr\u00fcr.<br \/>\n3. <strong>Diziler \u00fczerinde indeks olu\u015fturmak m\u00fcmk\u00fcn m\u00fc?<\/strong> Do\u011frudan de\u011fil, ancak elemanlar\u0131 ayr\u0131 s\u00fctunlara ay\u0131r\u0131p indeks olu\u015fturabilirsiniz.<br \/>\n4. <strong>Performans\u0131 nas\u0131l optimize edebilirim?<\/strong> \u0130ndeksleme, fonksiyon optimizasyonu ve veritaban\u0131 tasar\u0131m\u0131 g\u00f6zden ge\u00e7irilmelidir.<br \/>\n5. <strong>Karma\u015f\u0131k silme i\u015flemleri i\u00e7in ne yapabilirim?<\/strong> \u00d6zelle\u015ftirilmi\u015f fonksiyonlar olu\u015fturabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;den Dizi Eleman\u0131n\u0131 Silmenin 7 Yolu PostgreSQL veritaban\u0131n\u0131zda dizi tipinde veriler sakl\u0131yor ve bu dizilerden belirli de\u011ferleri&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-26667","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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