{"id":26483,"date":"2025-07-26T00:15:22","date_gmt":"2025-07-25T21:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-birden-fazla-boslugu-tek-boslukla-degistirme\/"},"modified":"2025-07-26T00:15:22","modified_gmt":"2025-07-25T21:15:22","slug":"postgresql-birden-fazla-boslugu-tek-boslukla-degistirme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-birden-fazla-boslugu-tek-boslukla-degistirme\/","title":{"rendered":"PostgreSQL: Birden Fazla Bo\u015flu\u011fu Tek Bo\u015flukla De\u011fi\u015ftirme"},"content":{"rendered":"<p># PostgreSQL&#8217;de \u00c7oklu Bo\u015fluklar\u0131 Tek Bo\u015flukla De\u011fi\u015ftirme<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda metin verilerinizle \u00e7al\u0131\u015f\u0131rken, \u00f6zellikle veri giri\u015finin farkl\u0131 kaynaklardan yap\u0131ld\u0131\u011f\u0131 durumlarda, birden fazla bo\u015flu\u011fun tek bir bo\u015flukla de\u011fi\u015ftirilmesi gere\u011fi s\u0131kl\u0131kla ortaya \u00e7\u0131kar.  Bu durum, veri tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamak, arama ve s\u0131ralama i\u015flemlerinin verimlili\u011fini art\u0131rmak ve veri analizi sonu\u00e7lar\u0131n\u0131n do\u011frulu\u011funu garantilemek i\u00e7in olduk\u00e7a \u00f6nemlidir. Bu makalede, PostgreSQL&#8217;de \u00e7oklu bo\u015fluklar\u0131 tek bo\u015flukla de\u011fi\u015ftirmenin farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ad\u0131m ad\u0131m ele alaca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> <code class=\"language-\">REPLACE<\/code> fonksiyonu ile basit bir \u00e7\u00f6z\u00fcm.<br \/>\n* <strong>Orta Seviye:<\/strong> <code class=\"language-\">regexp_replace<\/code> fonksiyonu ile geli\u015fmi\u015f kontrol ve ger\u00e7ek d\u00fcnya \u00f6rne\u011fi. Optimizasyon ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri Seviye:<\/strong> Performans analizi, farkl\u0131 y\u00f6ntemlerin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131 ve edge case&#8217;ler.<\/p>\n<p><strong>PostgreSQL&#8217;de Bo\u015fluklar\u0131 \u0130\u015fleme: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, metin verilerini i\u015flemek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Bu fonksiyonlar, bo\u015fluk karakterlerini tespit etmek, de\u011fi\u015ftirmek ve manip\u00fcle etmek i\u00e7in kullan\u0131labilir.  Bo\u015fluk karakteri, ASCII kodunda 32 de\u011ferine sahip g\u00f6r\u00fcnmez bir karakterdir.  Veri taban\u0131n\u0131zda birden fazla bo\u015fluk varsa, bu durum veri temizli\u011fi ve i\u015fleme a\u015famalar\u0131nda sorunlara yol a\u00e7abilir.  \u00d6rne\u011fin, bir isim alan\u0131nda &#8220;Ahmet   Mehmet&#8221; gibi bir giri\u015f, arama i\u015flemlerinde istenmeyen sonu\u00e7lara neden olabilir.  Bu nedenle, \u00e7oklu bo\u015fluklar\u0131 tek bir bo\u015flukla de\u011fi\u015ftirmek \u00f6nemli bir veri temizleme ad\u0131m\u0131d\u0131r.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r? <code class=\"language-\">REPLACE<\/code> Fonksiyonu ile Basit Bir \u00c7\u00f6z\u00fcm<\/strong><\/p>\n<p>En basit yakla\u015f\u0131m, PostgreSQL&#8217;in yerle\u015fik <code class=\"language-\">REPLACE<\/code> fonksiyonunu kullanmakt\u0131r.  Bu fonksiyon, bir metin i\u00e7indeki belirli bir alt dizeyi ba\u015fka bir alt dizeyle de\u011fi\u015ftirir.  Ancak, <code class=\"language-\">REPLACE<\/code> fonksiyonu bir seferde sadece bir bo\u015flu\u011fu de\u011fi\u015ftirir; bu nedenle, birden fazla ard\u0131\u015f\u0131k bo\u015flu\u011fu tek bir bo\u015flukla de\u011fi\u015ftirmek i\u00e7in farkl\u0131 bir yakla\u015f\u0131m gereklidir.  Bu basit yakla\u015f\u0131m\u0131n, sadece iki bo\u015flu\u011fun oldu\u011fu durumlarda i\u015fe yarad\u0131\u011f\u0131n\u0131 unutmamak \u00f6nemlidir.<\/p>\n<pre class=\"language-sql\"><code>SELECT REPLACE('Ahmet  Mehmet', '  ', ' '); -- \u0130ki bo\u015flu\u011fu tek bo\u015flukla de\u011fi\u015ftirir<\/code><\/pre>\n<p>Bu kod, iki bo\u015flu\u011fu tek bir bo\u015flukla de\u011fi\u015ftirir. Ancak, \u00fc\u00e7 veya daha fazla ard\u0131\u015f\u0131k bo\u015fluk varsa, bu y\u00f6ntem yeterli olmayacakt\u0131r.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r? <code class=\"language-\">regexp_replace<\/code> Fonksiyonu ile Geli\u015fmi\u015f Kontrol<\/strong><\/p>\n<p>Daha g\u00fc\u00e7l\u00fc ve esnek bir \u00e7\u00f6z\u00fcm i\u00e7in <code class=\"language-\">regexp_replace<\/code> fonksiyonunu kullanabiliriz. Bu fonksiyon, d\u00fczenli ifadeler (regular expressions) kullanarak metin i\u00e7indeki desenleri e\u015fle\u015ftirir ve de\u011fi\u015ftirir.  Birden fazla bo\u015flu\u011fu tek bir bo\u015flukla de\u011fi\u015ftirmek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT regexp_replace('Ahmet   Mehmet  Mustafa     ', '\\s+', ' ', 'g');<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">\\s+<\/code> d\u00fczenli ifadesini kullanarak bir veya daha fazla bo\u015fluk karakterini (<code class=\"language-\">\\s<\/code>) arar ve bunlar\u0131 tek bir bo\u015flukla de\u011fi\u015ftirir (<code class=\"language-\">' '<\/code>).  <code class=\"language-\">g<\/code> bayra\u011f\u0131, t\u00fcm e\u015fle\u015fmeleri de\u011fi\u015ftirmek i\u00e7in kullan\u0131l\u0131r.  Bu y\u00f6ntem, herhangi bir say\u0131da ard\u0131\u015f\u0131k bo\u015flu\u011fu tek bir bo\u015flukla de\u011fi\u015ftirmek i\u00e7in etkili bir \u00e7\u00f6z\u00fcmd\u00fcr.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: \u00dcr\u00fcn A\u00e7\u0131klamalar\u0131n\u0131n Temizlenmesi<\/strong><\/p>\n<p>Bir e-ticaret sitesinin \u00fcr\u00fcn a\u00e7\u0131klamalar\u0131n\u0131 ele alal\u0131m.  Kullan\u0131c\u0131lar \u00fcr\u00fcn a\u00e7\u0131klamalar\u0131n\u0131 farkl\u0131 \u015fekillerde yazabilirler, baz\u0131lar\u0131 birden fazla bo\u015fluk kullanabilir.  Bu durum, arama motorlar\u0131 i\u00e7in optimizasyon ve kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan sorun yaratabilir.  <code class=\"language-\">regexp_replace<\/code> fonksiyonunu kullanarak, bu a\u00e7\u0131klamalar\u0131 temizleyebiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET aciklama = regexp_replace(aciklama, '\\s+', ' ', 'g')\nWHERE LENGTH(aciklama) &gt; 0;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urunler<\/code> tablosundaki t\u00fcm \u00fcr\u00fcn a\u00e7\u0131klamalar\u0131n\u0131 temizler ve birden fazla bo\u015flu\u011fu tek bir bo\u015flukla de\u011fi\u015ftirir.  <code class=\"language-\">WHERE<\/code> ko\u015fulu, bo\u015f olmayan a\u00e7\u0131klamalar\u0131 filtreleyerek gereksiz i\u015flem y\u00fck\u00fcn\u00fc azalt\u0131r.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>Veri setiniz b\u00fcy\u00fckse, <code class=\"language-\">regexp_replace<\/code> fonksiyonunun performans\u0131 \u00f6nemli olabilir.  \u0130\u015fte baz\u0131 performans optimizasyon ipu\u00e7lar\u0131:<\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong>  E\u011fer m\u00fcmk\u00fcnse, <code class=\"language-\">aciklama<\/code> s\u00fctununa bir indeks eklemek, sorgu performans\u0131n\u0131 art\u0131rabilir.  Ancak, d\u00fczenli ifadeler indekslemeyi zorla\u015ft\u0131rabilir, bu nedenle indekslemeyi dikkatlice de\u011ferlendirmek gerekir.<br \/>\n* <strong>Fonksiyonel \u0130ndeksler:<\/strong>  Performans\u0131n\u0131 daha da art\u0131rmak i\u00e7in fonksiyonel indeksler kullanabilirsiniz.<br \/>\n* <strong>Par\u00e7al\u0131 \u0130\u015flem:<\/strong>  \u00c7ok b\u00fcy\u00fck bir veri setini k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lerek i\u015flemeyi deneyebilirsiniz.<br \/>\n* <strong>\u0130\u015flem Zamanlamas\u0131:<\/strong>  Veritaban\u0131 sunucusunun yo\u011fun olmad\u0131\u011f\u0131 bir zamanda bu i\u015flemi ger\u00e7ekle\u015ftirmek daha iyi bir performans sa\u011flayabilir.  [Fatih Soysal&#8217;\u0131n](https:\/\/fatihsoysal.com) blogunda veritaban\u0131 optimizasyonu hakk\u0131nda daha fazla bilgi bulabilirsiniz.<\/p>\n<p><strong>\u0130leri Seviye: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>Farkl\u0131 y\u00f6ntemlerin performans\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131rmak i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabilirsiniz.  Bu komut, sorguyu \u00e7al\u0131\u015ft\u0131r\u0131rken ger\u00e7ekle\u015fen i\u015flemleri ve performans istatistiklerini g\u00f6sterir.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>EXPLAIN ANALYZE SELECT regexp_replace('Ahmet   Mehmet  Mustafa     ', '\\s+', ' ', 'g');<\/code><\/pre>\n<p>Bu komut, <code class=\"language-\">regexp_replace<\/code> fonksiyonunun performans\u0131n\u0131 analiz eder.  Sonu\u00e7lar\u0131 inceleyerek, sorguyu optimize etmek i\u00e7in ad\u0131mlar atabilirsiniz.<\/p>\n<p>Edge case&#8217;ler, beklenmedik veya nadir g\u00f6r\u00fclen durumlard\u0131r.  \u00d6rne\u011fin, baz\u0131 metinlerde  <code class=\"language-\">\\t<\/code> (tab) veya <code class=\"language-\">\\n<\/code> (yeni sat\u0131r) karakterleri de \u00e7oklu bo\u015fluklar gibi davranabilir.  Bu durumlar i\u00e7in d\u00fczenli ifadenizi geni\u015fletmeniz gerekebilir:<\/p>\n<pre class=\"language-sql\"><code>SELECT regexp_replace('Ahmet\tMehmet\\nMustafa     ', '[\\s\\t\\n]+', ' ', 'g');<\/code><\/pre>\n<p>Bu d\u00fczenli ifade, bo\u015fluk (<code class=\"language-\">\\s<\/code>), tab (<code class=\"language-\">\\t<\/code>) ve yeni sat\u0131r (<code class=\"language-\">\\n<\/code>) karakterlerini de kapsar.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de \u00e7oklu bo\u015fluklar\u0131 tek bo\u015flukla de\u011fi\u015ftirmek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  Basit durumlarda <code class=\"language-\">REPLACE<\/code> fonksiyonu yeterli olabilirken, daha karma\u015f\u0131k durumlar ve b\u00fcy\u00fck veri setleri i\u00e7in <code class=\"language-\">regexp_replace<\/code> fonksiyonu ve performans optimizasyon teknikleri kullan\u0131lmal\u0131d\u0131r.  Uygun y\u00f6ntemi se\u00e7mek, veri setinin b\u00fcy\u00fckl\u00fc\u011f\u00fc, veri kalitesi ve performans gereksinimlerine ba\u011fl\u0131d\u0131r.  Veri temizli\u011fi ve optimizasyonu i\u00e7in dikkatli bir planlama ve test yap\u0131lmas\u0131 \u00f6nerilir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">regexp_replace<\/code> fonksiyonunun performans\u0131 nas\u0131l iyile\u015ftirilebilir?<\/strong>  \u0130ndeksleme, fonksiyonel indeksler ve par\u00e7al\u0131 i\u015flem gibi y\u00f6ntemler kullan\u0131labilir.<br \/>\n2. <strong>\u00c7oklu bo\u015fluklar\u0131n yerine farkl\u0131 bir karakter koymak m\u00fcmk\u00fcn m\u00fc?<\/strong>  Evet, <code class=\"language-\">regexp_replace<\/code> fonksiyonunda de\u011fi\u015ftirme dizesini istedi\u011finiz karaktere ayarlayabilirsiniz.<br \/>\n3. <strong><code class=\"language-\">REPLACE<\/code> ve <code class=\"language-\">regexp_replace<\/code> aras\u0131ndaki fark nedir?<\/strong> <code class=\"language-\">REPLACE<\/code> belirli bir dizeyi de\u011fi\u015ftirirken, <code class=\"language-\">regexp_replace<\/code> d\u00fczenli ifadeler kullanarak daha karma\u015f\u0131k desenleri de\u011fi\u015ftirir.<br \/>\n4. <strong>Bo\u015fluk olmayan karakterleri de i\u00e7eren d\u00fczenli ifadeler nas\u0131l olu\u015fturulur?<\/strong>  <code class=\"language-\">\\S<\/code> karakter s\u0131n\u0131f\u0131 bo\u015fluk olmayan karakterleri temsil eder.<br \/>\n5. <strong>\u00c7ok b\u00fcy\u00fck bir veri setinde bu i\u015flemi nas\u0131l g\u00fcvenli ve verimli bir \u015fekilde ger\u00e7ekle\u015ftirebilirim?<\/strong>  Veri taban\u0131n\u0131z\u0131 yedekledikten sonra, par\u00e7al\u0131 i\u015flem ve uygun indeksleme stratejileri kullanarak i\u015flemi ger\u00e7ekle\u015ftirebilirsiniz.  \u0130\u015flemin etkisini izlemek ve gerekti\u011finde geri alma i\u015flemi yapmak \u00f6nemlidir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de \u00c7oklu Bo\u015fluklar\u0131 Tek Bo\u015flukla De\u011fi\u015ftirme PostgreSQL veritaban\u0131n\u0131zda metin verilerinizle \u00e7al\u0131\u015f\u0131rken, \u00f6zellikle veri giri\u015finin farkl\u0131 kaynaklardan yap\u0131ld\u0131\u011f\u0131&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-26483","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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