{"id":25834,"date":"2025-07-14T06:15:22","date_gmt":"2025-07-14T03:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/"},"modified":"2025-07-14T06:15:22","modified_gmt":"2025-07-14T03:15:22","slug":"postgresqlde-dizi-dilimlenmesi-orneklerle","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/","title":{"rendered":"PostgreSQL&#8217;de Dizi Dilimlenmesi (\u00d6rneklerle)"},"content":{"rendered":"<p># PostgreSQL Dizileri Nas\u0131l Par\u00e7alan\u0131r? (\u00d6rneklerle)<\/p>\n<p>PostgreSQL veritabanlar\u0131nda dizi verisiyle \u00e7al\u0131\u015f\u0131rken, genellikle dizinin sadece bir b\u00f6l\u00fcm\u00fcn\u00fc almak, yani diziyi par\u00e7alamak (slice) ihtiyac\u0131 duyars\u0131n\u0131z.  \u00d6rne\u011fin, bir m\u00fc\u015fteri sipari\u015flerinin sadece son be\u015fini g\u00f6r\u00fcnt\u00fclemek veya bir sens\u00f6rden gelen veri ak\u0131\u015f\u0131n\u0131n belirli bir zaman aral\u0131\u011f\u0131ndaki de\u011ferlerini analiz etmek isteyebilirsiniz. Bu makalede, PostgreSQL&#8217;de dizi par\u00e7alama i\u015flemlerini ad\u0131m ad\u0131m, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi \u015fekilde a\u00e7\u0131klayaca\u011f\u0131z.  PostgreSQL dizi i\u015flemlerinin inceliklerini ve performans optimizasyonunu ele alarak, veritaban\u0131 i\u015flemlerinizi daha verimli hale getirmenize yard\u0131mc\u0131 olaca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">array_slice<\/code> fonksiyonunun temel kullan\u0131m\u0131 ve basit \u00f6rnekler.<\/p>\n<p><strong>Orta Seviye:<\/strong>  Ger\u00e7ek d\u00fcnya senaryolar\u0131,  <code class=\"language-\">array_slice<\/code> ile birlikte di\u011fer PostgreSQL fonksiyonlar\u0131n\u0131n kullan\u0131m\u0131 ve performans ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Performans analizi, s\u0131n\u0131r durumlar\u0131 (edge cases) ve karma\u015f\u0131k dizi i\u015flemlerinde <code class=\"language-\">array_slice<\/code>&#8216;\u0131n etkin kullan\u0131m\u0131.<\/p>\n<p><strong>PostgreSQL Dizileri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, \u00e7e\u015fitli veri tiplerini destekler ve bunlardan biri de dizilerdir. Diziler, ayn\u0131 veri tipinde birden fazla de\u011feri tek bir de\u011fi\u015fkende saklaman\u0131z\u0131 sa\u011flar.  \u00d6rne\u011fin, bir m\u00fc\u015fterinin sipari\u015f tarihlerini, \u00fcr\u00fcn ID&#8217;lerini veya \u00fcr\u00fcn isimlerini bir dizi i\u00e7inde tutabilirsiniz.  Diziler, <code class=\"language-\">{}<\/code> k\u00fcme ayra\u00e7lar\u0131 kullan\u0131larak tan\u0131mlan\u0131r ve elemanlar virg\u00fclle ayr\u0131l\u0131r. \u00d6rne\u011fin, <code class=\"language-\">'{1, 2, 3, 4, 5}'<\/code> be\u015f elemanl\u0131 bir tamsay\u0131 dizisidir.  Diziler,  <code class=\"language-\">INTEGER[]<\/code>, <code class=\"language-\">TEXT[]<\/code>, <code class=\"language-\">DATE[]<\/code> gibi \u00e7e\u015fitli veri tiplerinde olabilir.  Daha detayl\u0131 bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL e\u011fitimlerine](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p><strong>PostgreSQL Dizilerini Par\u00e7alama: <code class=\"language-\">array_slice<\/code> Fonksiyonu<\/strong><\/p>\n<p>PostgreSQL&#8217;de dizileri par\u00e7alamak i\u00e7in <code class=\"language-\">array_slice<\/code> fonksiyonunu kullan\u0131r\u0131z. Bu fonksiyon, \u00fc\u00e7 parametre al\u0131r:<\/p>\n<p>* <strong>Dizi:<\/strong> Par\u00e7alanacak dizi.<br \/>\n* <strong>Ba\u015flang\u0131\u00e7 \u0130ndeksi:<\/strong> Par\u00e7an\u0131n ba\u015flayaca\u011f\u0131 indeks (1&#8217;den ba\u015flar).<br \/>\n* <strong>Biti\u015f \u0130ndeksi:<\/strong> Par\u00e7an\u0131n bitece\u011fi indeks.<\/p>\n<p>Fonksiyon, belirtilen indeksler aras\u0131ndaki dizi elemanlar\u0131n\u0131 i\u00e7eren yeni bir dizi d\u00f6nd\u00fcr\u00fcr.  \u0130ndeksler negatif olabilir. Negatif indeksler dizinin sonundan itibaren saymaya ba\u015flar. \u00d6rne\u011fin, -1 son eleman\u0131, -2 sondan ikinci eleman\u0131 g\u00f6sterir.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r?  <code class=\"language-\">array_slice<\/code> ile Basit \u00d6rnekler (Yeni Ba\u015flayanlar \u0130\u00e7in)<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki \u00f6rnekte, <code class=\"language-\">'{10, 20, 30, 40, 50}'<\/code> dizisinin 2. indeksten (yani ikinci elemandan) ba\u015flay\u0131p 4. indekse (d\u00f6rd\u00fcnc\u00fc elemana) kadar olan k\u0131sm\u0131n\u0131 se\u00e7ece\u011fiz:<\/p>\n<pre class=\"language-sql\"><code>SELECT array_slice('{10, 20, 30, 40, 50}'::integer[], 2, 4);<\/code><\/pre>\n<p>Sonu\u00e7: <code class=\"language-\">{20, 30, 40}<\/code><\/p>\n<p>\u015eimdi de dizinin son iki eleman\u0131n\u0131 se\u00e7elim:<\/p>\n<pre class=\"language-sql\"><code>SELECT array_slice('{10, 20, 30, 40, 50}'::integer[], -2, 5);<\/code><\/pre>\n<p>Sonu\u00e7: <code class=\"language-\">{40, 50}<\/code><\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: Son Sipari\u015fleri Getirme (Orta Seviye)<\/strong><\/p>\n<p>Bir e-ticaret sitesinin veritaban\u0131nda, her m\u00fc\u015fterinin sipari\u015f tarihlerini tutan bir <code class=\"language-\">orders<\/code> tablosu oldu\u011funu d\u00fc\u015f\u00fcnelim:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE orders (\n    customer_id INTEGER,\n    order_dates DATE[]\n);\n\nINSERT INTO orders (customer_id, order_dates) VALUES\n(1, '{2023-10-26, 2023-10-27, 2023-10-28, 2023-10-29, 2023-10-30}'),\n(2, '{2023-10-20, 2023-10-22, 2023-10-25}');<\/code><\/pre>\n<p>M\u00fc\u015fteri 1&#8217;in son \u00fc\u00e7 sipari\u015f tarihini almak i\u00e7in \u015fu sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT array_slice(order_dates, -3, array_length(order_dates, 1))\nFROM orders\nWHERE customer_id = 1;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">array_length<\/code> fonksiyonunu kullanarak dizinin uzunlu\u011funu belirler ve <code class=\"language-\">array_slice<\/code> fonksiyonuna biti\u015f indeksi olarak kullan\u0131r.  Bu sayede, her zaman dizinin son \u00fc\u00e7 eleman\u0131n\u0131 al\u0131r\u0131z, dizinin uzunlu\u011fu ne olursa olsun.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong>  Dizilerin b\u00fcy\u00fck bir b\u00f6l\u00fcm\u00fcn\u00fc se\u00e7meniz gerekiyorsa, <code class=\"language-\">array_slice<\/code> i\u015fleminin performans\u0131 d\u00fc\u015febilir.  Bu durumlarda, veritaban\u0131 tasar\u0131m\u0131n\u0131z\u0131 g\u00f6zden ge\u00e7irmeniz ve belki de dizi yerine ayr\u0131 bir tablo kullanman\u0131z gerekebilir.<br \/>\n* <strong>Fonksiyon \u0130ndeksleri:<\/strong>  E\u011fer <code class=\"language-\">array_slice<\/code> fonksiyonunu s\u0131k s\u0131k kullan\u0131yorsan\u0131z, fonksiyon indeksleri olu\u015fturmay\u0131 d\u00fc\u015f\u00fcnebilirsiniz.  Ancak, fonksiyon indekslerinin olu\u015fturulmas\u0131 ve bak\u0131m\u0131 maliyetli olabilir.<br \/>\n* <strong>Par\u00e7alama Boyutunu Optimize Etme:<\/strong>  M\u00fcmk\u00fcn oldu\u011funca k\u00fc\u00e7\u00fck dizi par\u00e7alar\u0131 se\u00e7meye \u00e7al\u0131\u015f\u0131n. B\u00fcy\u00fck dizi par\u00e7alar\u0131 daha fazla i\u015flem g\u00fcc\u00fc gerektirir.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler: S\u0131n\u0131r Durumlar\u0131 ve Karma\u015f\u0131k Senaryolar<\/strong><\/p>\n<p><code class=\"language-\">array_slice<\/code> fonksiyonu, ba\u015flang\u0131\u00e7 ve biti\u015f indeksleri ge\u00e7ersiz oldu\u011funda (\u00f6rne\u011fin, indeksler dizinin s\u0131n\u0131rlar\u0131n\u0131n d\u0131\u015f\u0131nda) bo\u015f bir dizi d\u00f6nd\u00fcr\u00fcr. Bu durumlar\u0131 ele almak i\u00e7in, sorguyu yazarken bu durumu kontrol etmeli ve uygun hata y\u00f6netimi eklemelisiniz.  \u00d6rne\u011fin,  <code class=\"language-\">CASE<\/code> ifadesi kullanarak dizinin uzunlu\u011funu kontrol edebilir ve buna g\u00f6re farkl\u0131 bir i\u015flem ger\u00e7ekle\u015ftirebilirsiniz.<\/p>\n<p><strong>Performans Analizi ve \u0130leri D\u00fczey \u00d6rnekler<\/strong><\/p>\n<p>Karma\u015f\u0131k dizi i\u015flemlerinde, <code class=\"language-\">array_slice<\/code> ile birlikte <code class=\"language-\">unnest<\/code>, <code class=\"language-\">generate_series<\/code> gibi di\u011fer PostgreSQL fonksiyonlar\u0131n\u0131 kullanarak verimli sorgulamalar olu\u015fturabilirsiniz.  \u00d6rne\u011fin,  bir dizi i\u00e7indeki her eleman\u0131n karesi al\u0131nmas\u0131 ve sonucun yeni bir dizi olarak d\u00f6nd\u00fcr\u00fclmesi gibi i\u015flemler i\u00e7in <code class=\"language-\">unnest<\/code> ve <code class=\"language-\">array_agg<\/code> fonksiyonlar\u0131 ile birlikte <code class=\"language-\">array_slice<\/code> kullanabilirsiniz.  Performans analizini, <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile yapabilirsiniz.  Bu komut, sorguyu \u00e7al\u0131\u015ft\u0131rmadan \u00f6nce sorgu plan\u0131n\u0131 g\u00f6sterir ve sorguyu \u00e7al\u0131\u015ft\u0131rd\u0131ktan sonra ger\u00e7ek \u00e7al\u0131\u015fma s\u00fcresini g\u00f6sterir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de dizi par\u00e7alama, veritaban\u0131 i\u015flemlerinde b\u00fcy\u00fck kolayl\u0131k sa\u011flar.  <code class=\"language-\">array_slice<\/code> fonksiyonu, dizilerin belirli b\u00f6l\u00fcmlerini se\u00e7mek i\u00e7in g\u00fc\u00e7l\u00fc ve esnek bir ara\u00e7t\u0131r.  Ancak, performans optimizasyonu i\u00e7in veritaban\u0131 tasar\u0131m\u0131n\u0131z\u0131 ve sorgu yaz\u0131m tekniklerinizi dikkatlice planlaman\u0131z \u00f6nemlidir.  Bu makalede ele al\u0131nan teknikler ve \u00f6rneklerle, PostgreSQL dizileriyle daha verimli bir \u015fekilde \u00e7al\u0131\u015fabilir ve veritaban\u0131 uygulamalar\u0131n\u0131z\u0131 geli\u015ftirebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">array_slice<\/code> fonksiyonu negatif indeksleri destekliyor mu?<\/strong> Evet, negatif indeksler dizinin sonundan itibaren saymaya ba\u015flar.<\/p>\n<p>2. <strong><code class=\"language-\">array_slice<\/code> fonksiyonu bo\u015f bir dizi d\u00f6nd\u00fcr\u00fcrse ne olur?<\/strong> Bo\u015f bir dizi d\u00f6nd\u00fcr\u00fcl\u00fcr ve bu, genellikle bir hata durumunu g\u00f6stermez.<\/p>\n<p>3. <strong><code class=\"language-\">array_slice<\/code> fonksiyonunun performans\u0131n\u0131 nas\u0131l art\u0131rabilirim?<\/strong> \u0130ndeksleme, fonksiyon indeksleri ve k\u00fc\u00e7\u00fck dizi par\u00e7alar\u0131 kullanarak performans\u0131 art\u0131rabilirsiniz.<\/p>\n<p>4. <strong><code class=\"language-\">array_slice<\/code> ile di\u011fer PostgreSQL fonksiyonlar\u0131n\u0131 nas\u0131l birlikte kullanabilirim?<\/strong> <code class=\"language-\">unnest<\/code>, <code class=\"language-\">array_agg<\/code>, <code class=\"language-\">generate_series<\/code> gibi fonksiyonlarla birlikte kullanarak karma\u015f\u0131k dizi i\u015flemleri ger\u00e7ekle\u015ftirebilirsiniz.<\/p>\n<p>5. <strong>PostgreSQL dizileri hakk\u0131nda daha fazla bilgi nerede bulabilirim?<\/strong>  PostgreSQL d\u00f6k\u00fcmanlar\u0131na ve [Fatih Soysal&#8217;\u0131n PostgreSQL e\u011fitimlerine](https:\/\/fatihsoysal.com) bakabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL Dizileri Nas\u0131l Par\u00e7alan\u0131r? (\u00d6rneklerle) PostgreSQL veritabanlar\u0131nda dizi verisiyle \u00e7al\u0131\u015f\u0131rken, genellikle dizinin sadece bir b\u00f6l\u00fcm\u00fcn\u00fc almak, yani&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-25834","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 Dizi Dilimlenmesi (\u00d6rneklerle)<\/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-dizi-dilimlenmesi-orneklerle\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL&#039;de Dizi Dilimlenmesi (\u00d6rneklerle)\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-14T03:15:22+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=\"5 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL&#8217;de Dizi Dilimlenmesi (\u00d6rneklerle)\",\"datePublished\":\"2025-07-14T03:15:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\"},\"wordCount\":944,\"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-dizi-dilimlenmesi-orneklerle\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\",\"name\":\"PostgreSQL'de Dizi Dilimlenmesi (\u00d6rneklerle)\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-14T03:15:22+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresqlde-dizi-dilimlenmesi-orneklerle\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL&#8217;de Dizi Dilimlenmesi (\u00d6rneklerle)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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