{"id":26796,"date":"2025-07-31T21:15:22","date_gmt":"2025-07-31T18:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/"},"modified":"2025-07-31T21:15:22","modified_gmt":"2025-07-31T18:15:22","slug":"postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/","title":{"rendered":"PostgreSQL: string_to_array Fonksiyonundan N&#8217;inci Eleman\u0131 Alma"},"content":{"rendered":"<p># PostgreSQL&#8217;de string_to_array Fonksiyonundan N. Eleman\u0131 Nas\u0131l Al\u0131n\u0131r?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda virg\u00fcl, bo\u015fluk veya ba\u015fka bir ay\u0131r\u0131c\u0131 ile ayr\u0131lm\u0131\u015f bir metin dizisinden belirli bir eleman\u0131 \u00e7ekmeniz gerekiyor mu?  \u00d6rne\u011fin, bir kullan\u0131c\u0131n\u0131n ilgi alanlar\u0131n\u0131 &#8220;,&#8221; ile ayr\u0131lm\u0131\u015f bir string olarak saklad\u0131\u011f\u0131n\u0131z\u0131 ve sadece \u00fc\u00e7\u00fcnc\u00fc ilgi alan\u0131n\u0131 almak istedi\u011finizi d\u00fc\u015f\u00fcn\u00fcn. \u0130\u015fte bu noktada <code class=\"language-\">string_to_array<\/code> fonksiyonu ve dizinleme ile i\u015finizi kolayla\u015ft\u0131rabilirsiniz. Bu makalede, PostgreSQL&#8217;de <code class=\"language-\">string_to_array<\/code> fonksiyonundan N. eleman\u0131 nas\u0131l alaca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve performans optimizasyon teknikleriyle \u00f6\u011freneceksiniz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de <code class=\"language-\">string_to_array<\/code> fonksiyonundan N. eleman\u0131 alma konusunda farkl\u0131 seviyelerdeki bilgi birikimine sahip kullan\u0131c\u0131lar i\u00e7in haz\u0131rlanm\u0131\u015ft\u0131r.  A\u015fa\u011f\u0131daki yol haritas\u0131n\u0131 takip ederek, konuyu ad\u0131m ad\u0131m \u00f6\u011frenebilirsiniz:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> (Ad\u0131m ad\u0131m a\u00e7\u0131klama, Basit kod \u00f6rne\u011fi) \u2192 <strong>Orta:<\/strong> (Ger\u00e7ek hayat \u00f6rne\u011fi, Optimizasyon ipu\u00e7lar\u0131) \u2192 <strong>\u0130leri D\u00fczey:<\/strong> (Performans analizi, Edge caseler)<\/p>\n<p><strong>Temel Kavramlar: string_to_array ve Diziler<\/strong><\/p>\n<p>PostgreSQL, verileri saklamak ve i\u015flemek i\u00e7in \u00e7e\u015fitli veri tiplerini destekler. Bunlardan biri de dizi tipidir.  <code class=\"language-\">string_to_array<\/code> fonksiyonu, virg\u00fcl, bo\u015fluk veya belirledi\u011finiz ba\u015fka bir ay\u0131r\u0131c\u0131 ile ayr\u0131lm\u0131\u015f bir metin dizesini, PostgreSQL dizisine d\u00f6n\u00fc\u015ft\u00fcrmenizi sa\u011flar.  Bu dizi, daha sonra elemanlar\u0131na eri\u015fmek i\u00e7in indekslenebilir.<\/p>\n<p>\u00d6rne\u011fin,  <code class=\"language-\">\"elma,armut,\u00e7ilek\"<\/code> metin dizesini <code class=\"language-\">string_to_array<\/code> fonksiyonu ile bir diziye d\u00f6n\u00fc\u015ft\u00fcrelim:<\/p>\n<pre class=\"language-sql\"><code>SELECT string_to_array('elma,armut,\u00e7ilek', ',');<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">{\"elma\",\"armut\",\"\u00e7ilek\"}<\/code> \u00e7\u0131kt\u0131s\u0131n\u0131 verir.  Dizinin ilk eleman\u0131na 1. indeks, ikinci eleman\u0131na 2. indeks ve benzeri \u015fekilde eri\u015febilirsiniz.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r?  N. Eleman\u0131 Alma<\/strong><\/p>\n<p><code class=\"language-\">string_to_array<\/code> fonksiyonuyla olu\u015fturdu\u011fumuz diziden N. eleman\u0131 almak i\u00e7in dizinleme operat\u00f6r\u00fcn\u00fc (<code class=\"language-\">[]<\/code>) kullan\u0131r\u0131z.  \u0130ndeksleme 1&#8217;den ba\u015flar.  \u00d6rne\u011fin, yukar\u0131daki dizinin ikinci eleman\u0131n\u0131 (armut) almak i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT (string_to_array('elma,armut,\u00e7ilek', ','))[2];<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">\"armut\"<\/code> \u00e7\u0131kt\u0131s\u0131n\u0131 verir.<\/p>\n<p><strong>Ger\u00e7ek Hayatta string_to_array Kullan\u0131m\u0131: Vaka Analizi<\/strong><\/p>\n<p>Bir e-ticaret sitesi d\u00fc\u015f\u00fcn\u00fcn.  \u00dcr\u00fcnler, kategorilerini &#8220;,&#8221; ile ayr\u0131lm\u0131\u015f bir string olarak sakl\u0131yor olsun.  \u00d6rne\u011fin:  <code class=\"language-\">'Elektronik,Bilgisayar,Laptop'<\/code><\/p>\n<p>Bu kategorilerden sadece ilk kategoriyi almak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT (string_to_array(kategori, ','))[1] AS ilk_kategori\nFROM urunler\nWHERE urun_adi = 'Asus ROG Zephyrus';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">Asus ROG Zephyrus<\/code> \u00fcr\u00fcn\u00fcn\u00fcn ilk kategorisini (<code class=\"language-\">Elektronik<\/code>) d\u00f6nd\u00fcr\u00fcr.  Benzer \u015fekilde, ikinci veya \u00fc\u00e7\u00fcnc\u00fc kategorileri de indeks numaras\u0131n\u0131 de\u011fi\u015ftirerek alabilirsiniz.<\/p>\n<p><strong>Performans Optimizasyonu:  \u0130ndeksleme ve Fonksiyon Kullan\u0131m\u0131<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck bir veri setinde \u00e7al\u0131\u015f\u0131yorsan\u0131z, performans\u0131 optimize etmek \u00f6nemlidir.  <code class=\"language-\">string_to_array<\/code> fonksiyonu her sat\u0131r i\u00e7in \u00e7a\u011fr\u0131ld\u0131\u011f\u0131 i\u00e7in, performans sorunlar\u0131na yol a\u00e7abilir.  Bu durumu azaltmak i\u00e7in,  gerekti\u011finde <code class=\"language-\">string_to_array<\/code> fonksiyonunu \u00f6nceden hesaplayarak ve bir ara tabloya kaydederek  performans\u0131 art\u0131rabilirsiniz.  Veya,  PostgreSQL&#8217;in sundu\u011fu daha performansl\u0131 fonksiyonlar\u0131 kullanmay\u0131 d\u00fc\u015f\u00fcnebilirsiniz.  Ancak, bu durum veri yap\u0131n\u0131z\u0131n tasar\u0131m\u0131na ve veritaban\u0131n\u0131z\u0131n b\u00fcy\u00fckl\u00fc\u011f\u00fcne ba\u011fl\u0131d\u0131r.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresinden daha fazla performans optimizasyon tekni\u011fi hakk\u0131nda bilgi edinebilirsiniz.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r?  Hata Durumlar\u0131 ile Ba\u015f Etme<\/strong><\/p>\n<p><code class=\"language-\">string_to_array<\/code> fonksiyonundan N. eleman\u0131 al\u0131rken, dizinin uzunlu\u011fundan b\u00fcy\u00fck bir indeks numaras\u0131 belirledi\u011finizde bir hata olu\u015fabilir.  Bu gibi durumlarda, <code class=\"language-\">NULL<\/code> de\u011feri d\u00f6nd\u00fcrmek veya \u00f6zel bir hata mesaj\u0131 g\u00f6stermek isteyebilirsiniz.  Bunun i\u00e7in ko\u015fullu ifadeler kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT CASE \n    WHEN array_length(string_to_array('elma,armut', ','), 1) &gt;= 3 THEN (string_to_array('elma,armut', ','))[3]\n    ELSE NULL \n    END AS ucuncu_eleman;<\/code><\/pre>\n<p>Bu sorgu, dizinin uzunlu\u011fu 3&#8217;ten k\u00fc\u00e7\u00fckse <code class=\"language-\">NULL<\/code> de\u011feri d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler:  Karma\u015f\u0131k Ay\u0131r\u0131c\u0131lar ve Performans Analizi<\/strong><\/p>\n<p>Bazen verileriniz, basit bir virg\u00fcl veya bo\u015fluktan daha karma\u015f\u0131k ay\u0131r\u0131c\u0131lara sahip olabilir.  \u00d6rne\u011fin,  &#8220;|-&#8221; ile ayr\u0131lm\u0131\u015f bir stringiniz olsun.  <code class=\"language-\">string_to_array<\/code> fonksiyonu, ikinci parametre olarak bu ay\u0131r\u0131c\u0131y\u0131 kabul eder:<\/p>\n<pre class=\"language-sql\"><code>SELECT (string_to_array('elma|-armut|-\u00e7ilek', '|-'))[2];<\/code><\/pre>\n<p>Performans analizi i\u00e7in,  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgular\u0131n\u0131z\u0131n y\u00fcr\u00fctme plan\u0131n\u0131 ve s\u00fcresini inceleyebilirsiniz.  Bu, performans darbo\u011fazlar\u0131n\u0131 belirlemenize ve optimizasyon stratejileri geli\u015ftirmenize yard\u0131mc\u0131 olur.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de <code class=\"language-\">string_to_array<\/code> fonksiyonundan N. eleman\u0131 alma konusunda temel seviyeden ileri seviyeye kadar bir rehber sunduk.  Ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon teknikleriyle,  verilerinizi etkili bir \u015fekilde i\u015fleyebilir ve ihtiya\u00e7 duydu\u011funuz bilgileri kolayca alabilirsiniz.  Unutmay\u0131n ki, veritaban\u0131 performans\u0131, veri yap\u0131s\u0131 tasar\u0131m\u0131n\u0131z ve sorgular\u0131n\u0131z\u0131n optimizasyonu ile do\u011frudan ili\u015fkilidir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">string_to_array<\/code> fonksiyonu b\u00fcy\u00fck metinler i\u00e7in performans sorunlar\u0131na neden olur mu?<\/strong> Evet, b\u00fcy\u00fck metinler i\u00e7in performans sorunlar\u0131na neden olabilir.  Bu durumda, veritaban\u0131 tasar\u0131m\u0131n\u0131z\u0131 g\u00f6zden ge\u00e7irmeniz veya alternatif \u00e7\u00f6z\u00fcmler araman\u0131z gerekebilir.<\/p>\n<p>2. <strong>Dizinleme 0&#8217;dan m\u0131 ba\u015flar yoksa 1&#8217;den mi?<\/strong> PostgreSQL&#8217;de dizinleme 1&#8217;den ba\u015flar.<\/p>\n<p>3. <strong>Bo\u015f bir string&#8217;i <code class=\"language-\">string_to_array<\/code> ile i\u015flersem ne olur?<\/strong> Bo\u015f bir dizi (<code class=\"language-\">{}<\/code>) d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p>4. <strong>Ay\u0131r\u0131c\u0131 karakter string&#8217;in i\u00e7inde birden fazla kez bulunursa ne olur?<\/strong>  <code class=\"language-\">string_to_array<\/code> fonksiyonu, ay\u0131r\u0131c\u0131 karakteri her buldu\u011funda diziyi b\u00f6ler.<\/p>\n<p>5. <strong><code class=\"language-\">string_to_array<\/code> fonksiyonunun alternatifleri var m\u0131?<\/strong>  Veri yap\u0131n\u0131za ve ihtiya\u00e7lar\u0131n\u0131za ba\u011fl\u0131 olarak,  <code class=\"language-\">regexp_split_to_array<\/code> gibi alternatif fonksiyonlar kullan\u0131labilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de string_to_array Fonksiyonundan N. Eleman\u0131 Nas\u0131l Al\u0131n\u0131r? PostgreSQL veritaban\u0131n\u0131zda virg\u00fcl, bo\u015fluk veya ba\u015fka bir ay\u0131r\u0131c\u0131 ile ayr\u0131lm\u0131\u015f&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-26796","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: string_to_array Fonksiyonundan N&#039;inci Eleman\u0131 Alma<\/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\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: string_to_array Fonksiyonundan N&#039;inci Eleman\u0131 Alma\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-31T18:15:22+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\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: string_to_array Fonksiyonundan N&#8217;inci Eleman\u0131 Alma\",\"datePublished\":\"2025-07-31T18:15:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\"},\"wordCount\":838,\"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\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\",\"name\":\"PostgreSQL: string_to_array Fonksiyonundan N'inci Eleman\u0131 Alma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-31T18:15:22+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-string_to_array-fonksiyonundan-ninci-elemani-alma\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: string_to_array Fonksiyonundan N&#8217;inci Eleman\u0131 Alma\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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