{"id":26659,"date":"2025-07-28T18:15:23","date_gmt":"2025-07-28T15:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/"},"modified":"2025-07-28T18:15:23","modified_gmt":"2025-07-28T15:15:23","slug":"postgresql-bir-dizenin-son-karakterini-kaldirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/","title":{"rendered":"PostgreSQL: Bir Dizenin Son Karakterini Kald\u0131rma"},"content":{"rendered":"<p># PostgreSQL: String&#8217;in Son Karakterini Kald\u0131rma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, bazen bir string de\u011fi\u015fkenin son karakterini silmeniz gerekebilir.  Bu durum, veri temizleme i\u015flemleri, veri formatlama veya \u00f6zel karakterlerin kald\u0131r\u0131lmas\u0131 gibi bir\u00e7ok senaryoda ortaya \u00e7\u0131kabilir.  Bu makalede, PostgreSQL&#8217;de bir string&#8217;in son karakterini kald\u0131rman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ad\u0131m ad\u0131m inceleyece\u011fiz.  \u00d6rneklerimiz T\u00fcrk\u00e7e karakterleri de i\u00e7erecek ve ger\u00e7ek d\u00fcnya senaryolar\u0131na odaklanacakt\u0131r.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">substring()<\/code> fonksiyonu ile basit bir \u00e7\u00f6z\u00fcm.<\/p>\n<p><strong>Orta:<\/strong>  <code class=\"language-\">right()<\/code> fonksiyonu ile daha geli\u015fmi\u015f kullan\u0131m ve ger\u00e7ek d\u00fcnya \u00f6rne\u011fi, performans ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri D\u00fczey:<\/strong>  Performans analizi, bo\u015f stringler ve \u00e7ok uzun stringler gibi edge case&#8217;ler, alternatif y\u00f6ntemler.<\/p>\n<p><strong>PostgreSQL&#8217;de String \u0130\u015flemleri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc string manip\u00fclasyon fonksiyonlar\u0131 sunar.  Bu fonksiyonlar, stringleri kesmek, birle\u015ftirmek, de\u011fi\u015ftirmek ve analiz etmek i\u00e7in kullan\u0131l\u0131r.  <code class=\"language-\">substring()<\/code>, <code class=\"language-\">right()<\/code>, <code class=\"language-\">left()<\/code> gibi fonksiyonlar, string&#8217;lerin belirli k\u0131s\u0131mlar\u0131n\u0131 ay\u0131klamak i\u00e7in idealdir.  Bu makalede, \u00f6zellikle son karakteri kald\u0131rmak i\u00e7in <code class=\"language-\">substring()<\/code> ve <code class=\"language-\">right()<\/code> fonksiyonlar\u0131n\u0131 detayl\u0131 olarak inceleyece\u011fiz.  String uzunlu\u011funu bulmak i\u00e7in <code class=\"language-\">length()<\/code> fonksiyonunu da kullanaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL&#8217;de String&#8217;in Son Karakterini Kald\u0131rma: <code class=\"language-\">substring()<\/code> Fonksiyonu ile<\/strong><\/p>\n<p>En basit yakla\u015f\u0131m, <code class=\"language-\">substring()<\/code> fonksiyonunu kullanmakt\u0131r.  <code class=\"language-\">substring(string, start, length)<\/code> fonksiyonu, bir string&#8217;in belirli bir konumdan ba\u015flayarak belirli bir uzunluktaki alt dizisini d\u00f6nd\u00fcr\u00fcr.  Son karakteri kald\u0131rmak i\u00e7in, string&#8217;in ba\u015flang\u0131c\u0131ndan, uzunlu\u011fundan 1 eksik uzunlukta bir alt dize ay\u0131klayabiliriz.<\/p>\n<p><strong>Yeni Ba\u015flayan (Ad\u0131m ad\u0131m a\u00e7\u0131klama, Basit kod \u00f6rne\u011fi):<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki SQL sorgusu, &#8220;Merhaba D\u00fcnya!&#8221; stringinin son karakterini (&#8220;!&#8221;) kald\u0131rarak &#8220;Merhaba D\u00fcnya&#8221; d\u00f6nd\u00fcr\u00fcr:<\/p>\n<pre class=\"language-sql\"><code>SELECT substring('Merhaba D\u00fcnya!', 1, length('Merhaba D\u00fcnya!') - 1);<\/code><\/pre>\n<p>Bu sorgu, \u00f6nce stringin uzunlu\u011funu hesaplar (<code class=\"language-\">length('Merhaba D\u00fcnya!')<\/code>), ard\u0131ndan 1 \u00e7\u0131kararak son karakteri hari\u00e7 tutar.  <code class=\"language-\">substring()<\/code> fonksiyonu, 1. karakterden ba\u015flayarak, hesaplanan uzunlukta bir alt dize d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>PostgreSQL&#8217;de String&#8217;in Son Karakterini Kald\u0131rma: <code class=\"language-\">right()<\/code> Fonksiyonu ile<\/strong><\/p>\n<p><code class=\"language-\">right()<\/code> fonksiyonu, bir string&#8217;in sa\u011f taraf\u0131ndan belirli say\u0131da karakter d\u00f6nd\u00fcr\u00fcr.  Son karakteri kald\u0131rmak i\u00e7in, string&#8217;in uzunlu\u011fundan 1 eksik uzunlukta bir alt dize almas\u0131n\u0131 sa\u011flayabiliriz. Bu y\u00f6ntem, <code class=\"language-\">substring()<\/code>&#8216;e g\u00f6re daha \u00f6zl\u00fc ve okunabilir olabilir.<\/p>\n<p><strong>Orta (Ger\u00e7ek hayat \u00f6rne\u011fi, Optimizasyon ipu\u00e7lar\u0131):<\/strong><\/p>\n<p>Bir e-ticaret uygulamas\u0131 d\u00fc\u015f\u00fcnelim.  \u00dcr\u00fcn kodlar\u0131n\u0131n sonuna, \u00fcr\u00fcn\u00fcn stok durumunu belirten bir karakter ekleniyor (&#8220;A&#8221; stokta, &#8220;Y&#8221; stokta de\u011fil).  Stok durumunu g\u00f6steren karakteri kald\u0131rmak i\u00e7in <code class=\"language-\">right()<\/code> fonksiyonunu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT right(urun_kodu, length(urun_kodu) - 1) AS yeni_urun_kodu\nFROM urunler\nWHERE urun_kodu LIKE '%A' OR urun_kodu LIKE '%Y';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urunler<\/code> tablosundaki t\u00fcm \u00fcr\u00fcn kodlar\u0131n\u0131n son karakterini siler.  <code class=\"language-\">LIKE<\/code> ko\u015fulu, sadece son karakteri &#8220;A&#8221; veya &#8220;Y&#8221; olan \u00fcr\u00fcn kodlar\u0131n\u0131 filtreler.  Performans optimizasyonu i\u00e7in, <code class=\"language-\">urun_kodu<\/code> s\u00fctununa bir indeks eklemek faydal\u0131 olabilir.  Ayr\u0131ca, b\u00fcy\u00fck veri setlerinde i\u015flemi par\u00e7alara b\u00f6lerek (\u00f6rne\u011fin, belirli say\u0131da sat\u0131rda i\u015flem yaparak) performans\u0131 art\u0131rabiliriz.  B\u00fcy\u00fck veri setleri i\u00e7in,  [Fatih Soysal&#8217;\u0131n web sitesi](https:\/\/fatihsoysal.com)  gibi kaynaklardan daha geli\u015fmi\u015f optimizasyon teknikleri hakk\u0131nda bilgi alabilirsiniz.<\/p>\n<p><strong>Bo\u015f Stringler ve \u00c7ok Uzun Stringler: Edge Case&#8217;ler<\/strong><\/p>\n<p><strong>\u0130leri D\u00fczey (Performans analizi, Edge case&#8217;ler):<\/strong><\/p>\n<p>Bo\u015f stringler veya \u00e7ok uzun stringler i\u00e7in \u00f6zel durumlar ele al\u0131nmal\u0131d\u0131r.  Bo\u015f bir string&#8217;in son karakterini kald\u0131rmaya \u00e7al\u0131\u015fmak bir hata \u00fcretebilir.  Bu durumu kontrol etmek i\u00e7in <code class=\"language-\">CASE<\/code> ifadesi kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT CASE\n           WHEN length(my_string) &gt; 0 THEN substring(my_string, 1, length(my_string) - 1)\n           ELSE ''\n       END AS modified_string\nFROM my_table;<\/code><\/pre>\n<p>Bu sorgu, string bo\u015fsa bo\u015f string d\u00f6nd\u00fcr\u00fcr, aksi takdirde son karakteri silinmi\u015f stringi d\u00f6nd\u00fcr\u00fcr.  \u00c7ok uzun stringler i\u00e7in, bellekte sorunlar olu\u015fabilir.  B\u00fcy\u00fck stringler \u00fczerinde i\u015flem yaparken, performans analizi yaparak ve gerekti\u011finde daha verimli algoritmalar kullanarak bu sorunlar\u0131n \u00f6n\u00fcne ge\u00e7ebilirsiniz.  \u00d6rne\u011fin, b\u00fcy\u00fck stringleri par\u00e7alara b\u00f6lerek i\u015flem yapmak performans\u0131 art\u0131rabilir.<\/p>\n<p><strong>Alternatif Y\u00f6ntemler:  <code class=\"language-\">regexp_replace()<\/code> Fonksiyonu<\/strong><\/p>\n<p>PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc <code class=\"language-\">regexp_replace()<\/code> fonksiyonu da son karakteri kald\u0131rmak i\u00e7in kullan\u0131labilir.  Ancak, bu y\u00f6ntem daha karma\u015f\u0131kt\u0131r ve performans a\u00e7\u0131s\u0131ndan <code class=\"language-\">substring()<\/code> veya <code class=\"language-\">right()<\/code> fonksiyonlar\u0131ndan daha az verimli olabilir.<\/p>\n<pre class=\"language-sql\"><code>SELECT regexp_replace(my_string, '.$', '') AS modified_string\nFROM my_table;<\/code><\/pre>\n<p>Bu sorgu, stringin sonundaki herhangi bir karakteri kald\u0131r\u0131r.  <code class=\"language-\">.<\/code> herhangi bir karakteri, <code class=\"language-\">$<\/code> ise stringin sonunu temsil eder.<\/p>\n<p><strong>Performans Optimizasyonu<\/strong><\/p>\n<p>String i\u015flemleri, \u00f6zellikle b\u00fcy\u00fck veri setlerinde performans\u0131 etkileyebilir.  Performans\u0131 optimize etmek i\u00e7in a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131n\u0131 kullan\u0131n:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  String s\u00fctunlar\u0131na indeks eklemek, sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>Fonksiyon Se\u00e7imi:<\/strong> <code class=\"language-\">substring()<\/code> ve <code class=\"language-\">right()<\/code> fonksiyonlar\u0131 genellikle <code class=\"language-\">regexp_replace()<\/code>&#8216;den daha h\u0131zl\u0131d\u0131r.<br \/>\n* <strong>Par\u00e7alama:<\/strong> B\u00fcy\u00fck veri setlerinde i\u015flemleri par\u00e7alara b\u00f6lerek performans\u0131 art\u0131rabilirsiniz.<br \/>\n* <strong>Materialized Views:<\/strong>  S\u0131k\u00e7a kullan\u0131lan string i\u015flemlerinin sonu\u00e7lar\u0131n\u0131 \u00f6nceden hesaplayarak saklamak i\u00e7in materialized views kullanabilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de bir string&#8217;in son karakterini kald\u0131rman\u0131n \u00e7e\u015fitli y\u00f6ntemleri vard\u0131r.  <code class=\"language-\">substring()<\/code> ve <code class=\"language-\">right()<\/code> fonksiyonlar\u0131, basit ve verimli \u00e7\u00f6z\u00fcmler sunarken, <code class=\"language-\">regexp_replace()<\/code> daha karma\u015f\u0131k durumlar i\u00e7in kullan\u0131labilir.  Performans optimizasyonu i\u00e7in indeksler, fonksiyon se\u00e7imi, par\u00e7alama ve materialized views gibi teknikleri kullanmak \u00f6nemlidir.  Herhangi bir sorunuz i\u00e7in [Fatih Soysal&#8217;\u0131n web sitesini](https:\/\/fatihsoysal.com) ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular<\/strong><\/p>\n<p>1. <strong>Bo\u015f bir string&#8217;in son karakterini silmeye \u00e7al\u0131\u015f\u0131rsam ne olur?<\/strong>  Hata al\u0131rs\u0131n\u0131z.  Bu durumu <code class=\"language-\">CASE<\/code> ifadesi ile kontrol etmeniz gerekir.<\/p>\n<p>2. <strong>Hangi fonksiyon daha h\u0131zl\u0131d\u0131r: <code class=\"language-\">substring()<\/code>, <code class=\"language-\">right()<\/code> veya <code class=\"language-\">regexp_replace()<\/code>?<\/strong> Genellikle <code class=\"language-\">substring()<\/code> ve <code class=\"language-\">right()<\/code> fonksiyonlar\u0131 <code class=\"language-\">regexp_replace()<\/code>&#8216;den daha h\u0131zl\u0131d\u0131r.<\/p>\n<p>3. <strong>\u00c7ok b\u00fcy\u00fck stringler i\u00e7in performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  Stringleri par\u00e7alara b\u00f6lerek ve materialized views kullanarak performans\u0131 art\u0131rabilirsiniz.<\/p>\n<p>4. <strong>T\u00fcrk\u00e7e karakterler destekleniyor mu?<\/strong> Evet, PostgreSQL T\u00fcrk\u00e7e karakterleri sorunsuz destekler.<\/p>\n<p>5. <strong>Performans sorunlar\u0131n\u0131 nas\u0131l tespit edebilirim?<\/strong>  <code class=\"language-\">EXPLAIN<\/code> komutu ile sorgu plan\u0131n\u0131 inceleyerek performans darbo\u011fazlar\u0131n\u0131 tespit edebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL: String&#8217;in Son Karakterini Kald\u0131rma PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, bazen bir string de\u011fi\u015fkenin son karakterini silmeniz gerekebilir. Bu&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-26659","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: Bir Dizenin Son Karakterini Kald\u0131rma<\/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-bir-dizenin-son-karakterini-kaldirma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Bir Dizenin Son Karakterini Kald\u0131rma\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-28T15:15:23+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=\"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-bir-dizenin-son-karakterini-kaldirma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Bir Dizenin Son Karakterini Kald\u0131rma\",\"datePublished\":\"2025-07-28T15:15:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\"},\"wordCount\":939,\"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-bir-dizenin-son-karakterini-kaldirma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\",\"name\":\"PostgreSQL: Bir Dizenin Son Karakterini Kald\u0131rma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-28T15:15:23+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-dizenin-son-karakterini-kaldirma\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Bir Dizenin Son Karakterini Kald\u0131rma\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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