{"id":26445,"date":"2025-07-25T09:15:24","date_gmt":"2025-07-25T06:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-her-kelimenin-ilk-harfini-buyuk-harfle-yazma\/"},"modified":"2025-07-25T09:15:24","modified_gmt":"2025-07-25T06:15:24","slug":"postgresql-her-kelimenin-ilk-harfini-buyuk-harfle-yazma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-her-kelimenin-ilk-harfini-buyuk-harfle-yazma\/","title":{"rendered":"PostgreSQL: Her Kelimenin \u0130lk Harfini B\u00fcy\u00fck Harfle Yazma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Her Kelimenin \u0130lk Harfini B\u00fcy\u00fck Harfle Yazma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda bulunan bir metin alan\u0131ndaki her kelimenin ilk harfini b\u00fcy\u00fck harfle yazman\u0131z m\u0131 gerekiyor?  \u00dcr\u00fcn isimlerini, ba\u015fl\u0131klar\u0131 veya ki\u015fi isimlerini d\u00fczg\u00fcn bir \u015fekilde bi\u00e7imlendirmek i\u00e7in bu i\u015flemi s\u0131k s\u0131k yapman\u0131z gerekebilir. Bu makale, PostgreSQL&#8217;de bu i\u015flemi farkl\u0131 karma\u015f\u0131kl\u0131k seviyelerinde nas\u0131l ger\u00e7ekle\u015ftirece\u011finizi ad\u0131m ad\u0131m a\u00e7\u0131klayacak ve performans optimizasyonuna dair ipu\u00e7lar\u0131 sunacakt\u0131r.  Veritaban\u0131n\u0131zdaki verileri temizlemek ve tutarl\u0131 bir g\u00f6r\u00fcn\u00fcm sa\u011flamak i\u00e7in ihtiyac\u0131n\u0131z olan t\u00fcm bilgileri bulacaks\u0131n\u0131z.<\/p>\n<p><strong>PostgreSQL ve Metin \u0130\u015fleme: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc metin i\u015fleme fonksiyonlar\u0131 sunan bir veritaban\u0131 y\u00f6netim sistemidir. Bu fonksiyonlar, verilerinizi manip\u00fcle etmenizi ve bi\u00e7imlendirmenizi sa\u011flar.  Her kelimenin ilk harfini b\u00fcy\u00fck harfle yazma i\u015flemi i\u00e7in <code class=\"language-\">initcap()<\/code> fonksiyonu ve d\u00fczenli ifadeler (regex) kullanabiliriz.  <code class=\"language-\">initcap()<\/code> fonksiyonu, bir kelimenin ilk harfini b\u00fcy\u00fck harfe, di\u011ferlerini k\u00fc\u00e7\u00fck harfe d\u00f6n\u00fc\u015ft\u00fcr\u00fcr. Ancak,  c\u00fcmlelerin ortas\u0131ndaki noktalama i\u015faretleri gibi durumlar i\u00e7in daha g\u00fc\u00e7l\u00fc bir \u00e7\u00f6z\u00fcm olan d\u00fczenli ifadelere ihtiya\u00e7 duyabiliriz.  Bu makalede, her iki y\u00f6ntemi de ele alaca\u011f\u0131z ve hangisinin hangi senaryo i\u00e7in en uygun oldu\u011funu g\u00f6sterece\u011fiz. \u00d6rne\u011fin,  bir kitap katalo\u011funda bulunan kitap isimlerini veya bir m\u00fc\u015fteri veritaban\u0131ndaki ad ve soyadlar\u0131 d\u00fczenlerken bu teknikler olduk\u00e7a faydal\u0131d\u0131r.  Veri temizli\u011fi ve tutarl\u0131l\u0131\u011f\u0131 i\u00e7in bu tekniklerin \u00f6nemini hafife almamak gerekir.  Veri kalitesi, veritaban\u0131 uygulamalar\u0131n\u0131z\u0131n ba\u015far\u0131s\u0131 i\u00e7in \u00e7ok \u00f6nemlidir.<\/p>\n<p><strong>PostgreSQL&#8217;de <code class=\"language-\">initcap()<\/code> Fonksiyonunu Kullanarak Kelimelerin \u0130lk Harflerini B\u00fcy\u00fck Harfle Yazma: Yeni Ba\u015flayanlar \u0130\u00e7in<\/strong><\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131: Yeni Ba\u015flayan<\/strong><\/p>\n<p>Bu b\u00f6l\u00fcmde, <code class=\"language-\">initcap()<\/code> fonksiyonunu kullanarak basit bir \u00f6rnek \u00fczerinde i\u015flemi ger\u00e7ekle\u015ftirece\u011fiz.  Bu fonksiyon, bir metin dizesinin her kelimesinin ilk harfini b\u00fcy\u00fck harfle yazmay\u0131 sa\u011flar.<\/p>\n<p><strong>Ad\u0131m 1: \u00d6rnek Veri Olu\u015fturma<\/strong><\/p>\n<p>\u0130lk olarak, \u00f6rnek veriler i\u00e7eren bir tablo olu\u015ftural\u0131m:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE kitaplar (\n    id SERIAL PRIMARY KEY,\n    baslik TEXT\n);\n\nINSERT INTO kitaplar (baslik) VALUES\n('bir yaz gecesi r\u00fcyas\u0131'),\n('k\u00fc\u00e7\u00fck prens'),\n('binbir gece masallar\u0131');<\/code><\/pre>\n<p><strong>Ad\u0131m 2: <code class=\"language-\">initcap()<\/code> Fonksiyonunu Kullanma<\/strong><\/p>\n<p>\u015eimdi, <code class=\"language-\">initcap()<\/code> fonksiyonunu kullanarak ba\u015fl\u0131klar\u0131 d\u00fczeltelim:<\/p>\n<pre class=\"language-sql\"><code>UPDATE kitaplar\nSET baslik = initcap(baslik);\n\nSELECT * FROM kitaplar;<\/code><\/pre>\n<p>Bu kod, <code class=\"language-\">kitaplar<\/code> tablosundaki t\u00fcm ba\u015fl\u0131klar\u0131n ilk harflerini b\u00fcy\u00fck harfle yazarak g\u00fcnceller.  Sonu\u00e7 olarak, ba\u015fl\u0131klar &#8220;Bir Yaz Gecesi R\u00fcyas\u0131&#8221;, &#8220;K\u00fc\u00e7\u00fck Prens&#8221; ve &#8220;Binbir Gece Masallar\u0131&#8221; olarak g\u00fcncellenecektir.<\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi: \u00dcr\u00fcn Adlar\u0131n\u0131 Bi\u00e7imlendirme (Orta Seviye)<\/strong><\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131: Orta Seviye<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek bir senaryoya bakal\u0131m. Bir e-ticaret sitesi i\u00e7in \u00e7al\u0131\u015ft\u0131\u011f\u0131m\u0131z\u0131 ve \u00fcr\u00fcn adlar\u0131n\u0131 standartla\u015ft\u0131rmam\u0131z gerekti\u011fini varsayal\u0131m.  \u00dcr\u00fcn adlar\u0131 farkl\u0131 bi\u00e7imlerde kaydedilmi\u015f olabilir:  &#8220;iphone 13 pro max&#8221;, &#8220;Iphone 13 Pro Max&#8221;, &#8220;iPHONE 13 pro max&#8221; gibi. <code class=\"language-\">initcap()<\/code> fonksiyonu bu durumda yeterli olmayabilir \u00e7\u00fcnk\u00fc sadece ilk harfi b\u00fcy\u00fck harfle yazar.<\/p>\n<p><strong>\u00c7\u00f6z\u00fcm:<\/strong><\/p>\n<p>Bu sorunu \u00e7\u00f6zmek i\u00e7in, \u00f6ncelikle t\u00fcm harfleri k\u00fc\u00e7\u00fck harfe \u00e7evirmeli, ard\u0131ndan <code class=\"language-\">initcap()<\/code> fonksiyonunu kullanmal\u0131y\u0131z.  Bunun i\u00e7in a\u015fa\u011f\u0131daki SQL sorgusunu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET ad = initcap(lower(ad));<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urunler<\/code> tablosundaki t\u00fcm \u00fcr\u00fcn adlar\u0131n\u0131 \u00f6nce k\u00fc\u00e7\u00fck harfe \u00e7evirir, sonra <code class=\"language-\">initcap()<\/code> fonksiyonu ile her kelimenin ilk harfini b\u00fcy\u00fck harfe d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  Bu sayede, t\u00fcm \u00fcr\u00fcn adlar\u0131 tutarl\u0131 bir bi\u00e7imde kaydedilir.<\/p>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, <code class=\"language-\">UPDATE<\/code> sorgusunu k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lerek i\u015flemi daha h\u0131zl\u0131 hale getirebilirsiniz.  \u00d6rne\u011fin, <code class=\"language-\">WHERE<\/code> ko\u015fulu kullanarak verileri gruplara ay\u0131rabilir ve her grubu ayr\u0131 ayr\u0131 g\u00fcncelleyebilirsiniz.<br \/>\n* \u0130\u015flemin performans\u0131n\u0131 analiz etmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullan\u0131n.  Bu, sorgunun hangi a\u015famalar\u0131nda zaman kaybetti\u011fini anlaman\u0131za yard\u0131mc\u0131 olur.  [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesindeki PostgreSQL performans optimizasyonu makalelerine bakarak daha detayl\u0131 bilgi edinebilirsiniz.<\/p>\n<p><strong>D\u00fczenli \u0130fadeler ile Daha Karma\u015f\u0131k Durumlar\u0131 Ele Alma (\u0130leri D\u00fczey)<\/strong><\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131: \u0130leri D\u00fczey<\/strong><\/p>\n<p><code class=\"language-\">initcap()<\/code> fonksiyonu basit durumlar i\u00e7in yeterli olsa da,  noktalama i\u015faretleri, say\u0131lar veya \u00f6zel karakterler i\u00e7eren metinler i\u00e7in yetersiz kalabilir.  Bu t\u00fcr durumlar i\u00e7in d\u00fczenli ifadeler kullanmal\u0131y\u0131z.<\/p>\n<p><strong>Edge Case&#8217;ler ve \u00c7\u00f6z\u00fcmleri:<\/strong><\/p>\n<p>\u00d6rne\u011fin, &#8220;Dr. John Doe&#8221; gibi bir isim i\u00e7in <code class=\"language-\">initcap()<\/code> fonksiyonu &#8220;Dr. john doe&#8221; sonucunu verir.  Bu sorunu \u00e7\u00f6zmek i\u00e7in, d\u00fczenli ifadeler kullanarak kelimeleri do\u011fru bir \u015fekilde tan\u0131mlamal\u0131y\u0131z.<\/p>\n<p>A\u015fa\u011f\u0131daki fonksiyon, kelime s\u0131n\u0131rlar\u0131n\u0131 do\u011fru bir \u015fekilde belirleyerek her kelimenin ilk harfini b\u00fcy\u00fck harfe \u00e7evirir:<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION capitalize_first_letter(text)\nRETURNS text AS $$\nDECLARE\n  input_text ALIAS FOR $1;\nBEGIN\n  RETURN regexp_replace(input_text, '(\\m\\w)', upper('\\1'), 'g');\nEND;\n$$ LANGUAGE plpgsql;\n\nUPDATE kitaplar\nSET baslik = capitalize_first_letter(baslik);<\/code><\/pre>\n<p>Bu fonksiyon, <code class=\"language-\">regexp_replace()<\/code> fonksiyonunu kullanarak her kelimenin ba\u015f\u0131ndaki harfi (<code class=\"language-\">\\m\\w<\/code>) bulur ve b\u00fcy\u00fck harfle de\u011fi\u015ftirir (<code class=\"language-\">upper('\\1')<\/code>).  <code class=\"language-\">g<\/code> bayra\u011f\u0131, t\u00fcm e\u015fle\u015fmeleri de\u011fi\u015ftirir.<\/p>\n<p><strong>Performans Analizi:<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in d\u00fczenli ifadeler kullan\u0131m\u0131 performans\u0131 etkileyebilir.  Performans analizi i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgunun performans\u0131n\u0131 inceleyin ve gerekirse indeksleme veya di\u011fer optimizasyon tekniklerini uygulay\u0131n.<\/p>\n<p><strong>Vaka Analizi: Sosyal Medya Verilerinin Temizlenmesi<\/strong><\/p>\n<p>Bir sosyal medya analizi projesinde, kullan\u0131c\u0131 yorumlar\u0131n\u0131 i\u015flerken, yorumlardaki kelimelerin ilk harflerini b\u00fcy\u00fck harfle yazmak isteyebilirsiniz.  Bu, verileri daha okunabilir ve analiz edilebilir hale getirir.  Ancak, sosyal medya verileri genellikle noktalama i\u015faretleri, emojiler ve di\u011fer \u00f6zel karakterler i\u00e7erir. Bu durumda, yukar\u0131da a\u00e7\u0131klanan d\u00fczenli ifade tabanl\u0131 yakla\u015f\u0131m en uygun \u00e7\u00f6z\u00fcm olacakt\u0131r.  Bu yakla\u015f\u0131m,  noktalama i\u015faretleri ve \u00f6zel karakterler gibi karma\u015f\u0131k durumlarda bile do\u011fru sonu\u00e7lar sa\u011flar.<\/p>\n<p><strong>PostgreSQL&#8217;de Metin \u0130\u015fleme Fonksiyonlar\u0131n\u0131n Daha Derinlemesine \u0130ncelenmesi<\/strong><\/p>\n<p>PostgreSQL, metin i\u015fleme i\u00e7in bir\u00e7ok g\u00fc\u00e7l\u00fc fonksiyon sunar.  <code class=\"language-\">lower()<\/code>, <code class=\"language-\">upper()<\/code>, <code class=\"language-\">substring()<\/code>, <code class=\"language-\">replace()<\/code> gibi fonksiyonlar,  verilerinizi manip\u00fcle etmek ve temizlemek i\u00e7in kullan\u0131labilir.  Bu fonksiyonlar\u0131 birle\u015ftirerek, karma\u015f\u0131k metin i\u015fleme g\u00f6revlerini kolayca ger\u00e7ekle\u015ftirebilirsiniz.  [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesindeki PostgreSQL dok\u00fcmantasyonuna ve \u00f6rneklerine g\u00f6z atarak daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de her kelimenin ilk harfini b\u00fcy\u00fck harfle yazman\u0131n farkl\u0131 y\u00f6ntemlerini inceledik.  Basit durumlarda <code class=\"language-\">initcap()<\/code> fonksiyonu yeterli olurken, daha karma\u015f\u0131k durumlar i\u00e7in d\u00fczenli ifadeler kullanmak daha etkilidir.  Performans optimizasyonu i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu ve veritaban\u0131 indeksleme tekniklerini kullanmay\u0131 unutmay\u0131n.  Uygun y\u00f6ntemi se\u00e7erken veri setinizin \u00f6zelliklerini ve performans gereksinimlerinizi g\u00f6z \u00f6n\u00fcnde bulundurman\u0131z \u00f6nemlidir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">initcap()<\/code> fonksiyonu T\u00fcrk\u00e7e karakterleri destekliyor mu?<\/strong> Evet, <code class=\"language-\">initcap()<\/code> fonksiyonu T\u00fcrk\u00e7e karakterleri do\u011fru bir \u015fekilde i\u015fler.<br \/>\n2. <strong>D\u00fczenli ifadeler kullanman\u0131n performans maliyeti nedir?<\/strong> B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans maliyeti \u00f6nemli olabilir.  Optimizasyon teknikleri kullanarak bu maliyeti azaltabilirsiniz.<br \/>\n3. <strong>Hangi y\u00f6ntem daha h\u0131zl\u0131d\u0131r?<\/strong> Genellikle <code class=\"language-\">initcap()<\/code> fonksiyonu d\u00fczenli ifadelerden daha h\u0131zl\u0131d\u0131r, ancak veri setinizin yap\u0131s\u0131na ba\u011fl\u0131 olarak bu durum de\u011fi\u015febilir.<br \/>\n4. <strong>PostgreSQL&#8217;de metin i\u015fleme i\u00e7in ba\u015fka hangi fonksiyonlar kullan\u0131labilir?<\/strong>  <code class=\"language-\">lower()<\/code>, <code class=\"language-\">upper()<\/code>, <code class=\"language-\">substring()<\/code>, <code class=\"language-\">replace()<\/code>, <code class=\"language-\">regexp_matches()<\/code>, <code class=\"language-\">regexp_replace()<\/code> gibi bir\u00e7ok fonksiyon mevcuttur.<br \/>\n5. <strong>Karma\u015f\u0131k metin i\u015fleme g\u00f6revleri i\u00e7in hangi yakla\u015f\u0131m\u0131 \u00f6nerirsiniz?<\/strong> Karma\u015f\u0131k metin i\u015fleme g\u00f6revleri i\u00e7in d\u00fczenli ifadeler kullanmak daha esnek ve g\u00fc\u00e7l\u00fc bir \u00e7\u00f6z\u00fcm sunar.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Her Kelimenin \u0130lk Harfini B\u00fcy\u00fck Harfle Yazma PostgreSQL veritaban\u0131n\u0131zda bulunan bir metin alan\u0131ndaki her kelimenin ilk&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-26445","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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