{"id":26906,"date":"2025-08-02T15:15:24","date_gmt":"2025-08-02T12:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-onde-sifir-eklemeyle-sayilari-doldurma\/"},"modified":"2025-08-02T15:15:24","modified_gmt":"2025-08-02T12:15:24","slug":"postgresql-onde-sifir-eklemeyle-sayilari-doldurma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-onde-sifir-eklemeyle-sayilari-doldurma\/","title":{"rendered":"PostgreSQL: \u00d6nde S\u0131f\u0131r Eklemeyle Say\u0131lar\u0131 Doldurma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Say\u0131lar\u0131 Ba\u015ftan S\u0131f\u0131rlarla Doldurma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda say\u0131sal verileri i\u015flerken, \u00f6zellikle raporlama veya d\u0131\u015f sistemlerle entegrasyon s\u0131ras\u0131nda, say\u0131lar\u0131n belirli bir uzunlukta ve ba\u015ftan s\u0131f\u0131rlarla doldurulmu\u015f olarak g\u00f6r\u00fcnmesi gerekebilir. \u00d6rne\u011fin, fatura numaralar\u0131n\u0131 <code class=\"language-\">000123<\/code> gibi bi\u00e7imlendirmek veya \u00fcr\u00fcn kodlar\u0131n\u0131 <code class=\"language-\">000001<\/code> \u015feklinde g\u00f6stermek isteyebilirsiniz. Bu makalede, PostgreSQL&#8217;de say\u0131lar\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonunu ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ad\u0131m ad\u0131m inceleyece\u011fiz.  PostgreSQL&#8217;in sundu\u011fu g\u00fc\u00e7l\u00fc fonksiyonlar ile bu i\u015flemi nas\u0131l verimli bir \u015fekilde ger\u00e7ekle\u015ftirebilece\u011finizi \u00f6\u011freneceksiniz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, PostgreSQL&#8217;de say\u0131lar\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurma konusunda farkl\u0131 seviyelerdeki bilgi birikimine sahip kullan\u0131c\u0131lar i\u00e7in tasarlanm\u0131\u015ft\u0131r. A\u015fa\u011f\u0131daki yol haritas\u0131, \u00f6\u011frenme s\u00fcrecini ad\u0131m ad\u0131m y\u00f6nlendirecektir:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel <code class=\"language-\">to_char<\/code> fonksiyonu ile basit \u00f6rnekler ve ad\u0131m ad\u0131m a\u00e7\u0131klamalar.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, farkl\u0131 veri tipleri ve optimizasyon ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, karma\u015f\u0131k durumlar (edge cases) ve farkl\u0131 yakla\u015f\u0131m kar\u015f\u0131la\u015ft\u0131rmas\u0131.<\/p>\n<p><strong>PostgreSQL&#8217;de Say\u0131sal Verileri Bi\u00e7imlendirmenin Temelleri<\/strong><\/p>\n<p>PostgreSQL, say\u0131sal verileri \u00e7e\u015fitli bi\u00e7imlerde g\u00f6stermek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar. Bu fonksiyonlardan en \u00f6nemlisi <code class=\"language-\">to_char<\/code> fonksiyonudur. <code class=\"language-\">to_char<\/code> fonksiyonu, say\u0131sal verileri karakter dizisine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr ve formatlama se\u00e7enekleri sunar.  Say\u0131lar\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurmak i\u00e7in <code class=\"language-\">to_char<\/code> fonksiyonunda format \u015fablonunu do\u011fru bir \u015fekilde kullanmal\u0131y\u0131z.  \u00d6rne\u011fin, <code class=\"language-\">FM000000<\/code> format \u015fablonu, 6 basamakl\u0131 bir say\u0131y\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurur. <code class=\"language-\">FM<\/code> \u00f6neki, bo\u015fluklar\u0131 doldurarak say\u0131n\u0131n sol taraf\u0131ndaki bo\u015fluklar\u0131 ortadan kald\u0131r\u0131r.  Bu, say\u0131n\u0131n her zaman 6 basamakl\u0131 olmas\u0131n\u0131 sa\u011flar.  E\u011fer say\u0131 6 basamaktan az ise, eksik basamaklar\u0131 s\u0131f\u0131rlarla doldurur.<\/p>\n<p><strong>PostgreSQL&#8217;de Say\u0131lar\u0131 Ba\u015ftan S\u0131f\u0131rlarla Doldurma: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki SQL sorgusu, <code class=\"language-\">id<\/code> s\u00fctununda bulunan say\u0131lar\u0131 6 basamakl\u0131 olacak \u015fekilde ba\u015ftan s\u0131f\u0131rlarla doldurur:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(id, 'FM000000') AS formatted_id\nFROM my_table;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">my_table<\/code> tablosundaki her <code class=\"language-\">id<\/code> de\u011ferini al\u0131r ve <code class=\"language-\">to_char<\/code> fonksiyonunu kullanarak 6 basamakl\u0131 bir karakter dizisine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  <code class=\"language-\">FM<\/code> \u00f6neki, olas\u0131 ba\u015ftaki bo\u015fluklar\u0131 ortadan kald\u0131r\u0131r ve eksik basamaklar\u0131 s\u0131f\u0131rlarla doldurur.  <code class=\"language-\">formatted_id<\/code> s\u00fctunu, sonu\u00e7lar\u0131 g\u00f6sterir.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p>\u015eimdi, bir \u00fcr\u00fcn kodlama sistemini ele alal\u0131m. \u00dcr\u00fcn kodlar\u0131, 10 basamakl\u0131 ve ba\u015ftan s\u0131f\u0131rlarla doldurulmu\u015f olmal\u0131d\u0131r.  <code class=\"language-\">product_id<\/code> s\u00fctununu i\u00e7eren <code class=\"language-\">products<\/code> tablosunu d\u00fc\u015f\u00fcnelim:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE products (\n    product_id INTEGER,\n    product_name TEXT\n);\n\nINSERT INTO products (product_id, product_name) VALUES\n(123, '\u00dcr\u00fcn A'),\n(1234567890, '\u00dcr\u00fcn B'),\n(1, '\u00dcr\u00fcn C');<\/code><\/pre>\n<p>A\u015fa\u011f\u0131daki sorgu, <code class=\"language-\">product_id<\/code> s\u00fctunundaki de\u011ferleri 10 basamakl\u0131 olacak \u015fekilde ba\u015ftan s\u0131f\u0131rlarla doldurur:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(product_id, 'FM0000000000') AS formatted_product_id, product_name\nFROM products;<\/code><\/pre>\n<p>Bu sorgu, farkl\u0131 uzunluklardaki <code class=\"language-\">product_id<\/code> de\u011ferlerini ba\u015far\u0131yla 10 basama\u011fa tamamlar ve ba\u015ftan s\u0131f\u0131rlarla doldurur.  Bu, \u00fcr\u00fcn kodlar\u0131n\u0131n tutarl\u0131 bir \u015fekilde g\u00f6sterilmesini sa\u011flar.  Veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flamak i\u00e7in,  <code class=\"language-\">product_id<\/code> s\u00fctununu <code class=\"language-\">NUMERIC<\/code> veya <code class=\"language-\">BIGINT<\/code> gibi uygun bir say\u0131sal veri tipi ile tan\u0131mlamak \u00f6nemlidir.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolar i\u00e7in,  <code class=\"language-\">CASE<\/code> ifadeleri ve di\u011fer fonksiyonlarla <code class=\"language-\">to_char<\/code> fonksiyonunu birle\u015ftirebiliriz.  \u00d6rne\u011fin, farkl\u0131 \u00fcr\u00fcn kategorileri i\u00e7in farkl\u0131 uzunluklarda \u00fcr\u00fcn kodlar\u0131 kullanmak isteyebiliriz.  Bu durumda, <code class=\"language-\">CASE<\/code> ifadesi ile farkl\u0131 format \u015fablonlar\u0131n\u0131 ko\u015fullu olarak uygulayabiliriz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    CASE\n        WHEN category = 'A' THEN to_char(product_id, 'FM0000')\n        WHEN category = 'B' THEN to_char(product_id, 'FM000000')\n        ELSE to_char(product_id, 'FM00000000')\n    END AS formatted_product_id,\n    product_name\nFROM products;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">category<\/code> s\u00fctununa g\u00f6re farkl\u0131 format \u015fablonlar\u0131 kullanarak \u00fcr\u00fcn kodlar\u0131n\u0131 bi\u00e7imlendirir.  Bu, daha esnek ve \u00f6zelle\u015ftirilebilir bir \u00e7\u00f6z\u00fcm sunar.  Ancak, \u00e7ok say\u0131da ko\u015ful i\u00e7eren <code class=\"language-\">CASE<\/code> ifadeleri performans\u0131 olumsuz etkileyebilir.  Bu t\u00fcr durumlarda, performans optimizasyonu i\u00e7in indeksleme ve fonksiyon indeksleme tekniklerini kullanmak \u00f6nemlidir.  Ayr\u0131ca, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans analizi yapmak ve uygun indeksleme stratejilerini belirlemek gereklidir.  Bu analizler,  [fatihsoysal.com](https:\/\/fatihsoysal.com) gibi kaynaklarda bulunan PostgreSQL performans optimizasyon makaleleri ile desteklenebilir.<\/p>\n<p><strong>Performans Optimizasyonu<\/strong><\/p>\n<p><code class=\"language-\">to_char<\/code> fonksiyonu, her sat\u0131r i\u00e7in bir d\u00f6n\u00fc\u015ft\u00fcrme i\u015flemi ger\u00e7ekle\u015ftirir.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in bu i\u015flem zaman alabilir.  Performans\u0131 iyile\u015ftirmek i\u00e7in a\u015fa\u011f\u0131daki teknikleri kullanabilirsiniz:<\/p>\n<p>* <strong>Fonksiyon \u0130ndeksleri:<\/strong> <code class=\"language-\">to_char<\/code> fonksiyonunu kullanan sorgular i\u00e7in fonksiyon indeksleri olu\u015fturun.  Bu, PostgreSQL&#8217;in fonksiyonun sonucunu \u00f6nbelle\u011fe almas\u0131n\u0131 sa\u011flar ve tekrarlanan hesaplamalar\u0131 \u00f6nler.<br \/>\n* <strong>G\u00f6r\u00fcn\u00fcm (View) Kullan\u0131m\u0131:<\/strong>  S\u0131k\u00e7a kullan\u0131lan formatlanm\u0131\u015f verileri bir g\u00f6r\u00fcn\u00fcmde saklayarak, tekrarlanan <code class=\"language-\">to_char<\/code> i\u015flemlerinden ka\u00e7\u0131nabilirsiniz.  G\u00f6r\u00fcn\u00fcm, \u00f6nceden formatlanm\u0131\u015f verileri i\u00e7erecektir ve sorgular daha h\u0131zl\u0131 olacakt\u0131r.<br \/>\n* <strong>PostgreSQL s\u00fcr\u00fcm\u00fcne uygun optimizasyonlar:<\/strong> PostgreSQL&#8217;in farkl\u0131 s\u00fcr\u00fcmlerinde performans optimizasyon teknikleri farkl\u0131l\u0131k g\u00f6sterebilir.  Kullanmakta oldu\u011funuz s\u00fcr\u00fcm i\u00e7in en uygun y\u00f6ntemleri ara\u015ft\u0131rmak \u00f6nemlidir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131<\/strong><\/p>\n<p>* <strong>Fatura Numaralar\u0131:<\/strong>  Fatura numaralar\u0131n\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurarak, fatura numaralar\u0131n\u0131n s\u0131ralamas\u0131n\u0131 daha okunabilir ve tutarl\u0131 hale getirebilirsiniz.<br \/>\n* <strong>\u00dcr\u00fcn Kodlar\u0131:<\/strong>  \u00dcr\u00fcn kodlar\u0131n\u0131 belirli bir uzunlukta ve ba\u015ftan s\u0131f\u0131rlarla doldurarak, \u00fcr\u00fcn kodlar\u0131n\u0131n tutarl\u0131 bir \u015fekilde g\u00f6sterilmesini ve veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flayabilirsiniz.<br \/>\n* <strong>Raporlama:<\/strong>  Raporlarda say\u0131sal verilerin ba\u015ftan s\u0131f\u0131rlarla doldurulmu\u015f olarak g\u00f6sterilmesi, raporlar\u0131n daha okunabilir ve profesyonel g\u00f6r\u00fcnmesini sa\u011flar.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de say\u0131lar\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurmak i\u00e7in <code class=\"language-\">to_char<\/code> fonksiyonu etkili bir ara\u00e7t\u0131r.  Farkl\u0131 ihtiya\u00e7lara g\u00f6re format \u015fablonlar\u0131n\u0131 \u00f6zelle\u015ftirebilir ve performans optimizasyon tekniklerini kullanarak b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in de verimli sonu\u00e7lar elde edebilirsiniz.  Bu makalede ele al\u0131nan y\u00f6ntemler, \u00e7e\u015fitli ger\u00e7ek d\u00fcnya senaryolar\u0131nda say\u0131sal verilerin daha okunabilir ve tutarl\u0131 bir \u015fekilde g\u00f6sterilmesini sa\u011flar.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">to_char<\/code> fonksiyonu d\u0131\u015f\u0131nda ba\u015fka y\u00f6ntemler var m\u0131?<\/strong>  <code class=\"language-\">to_char<\/code> fonksiyonu en yayg\u0131n ve etkili y\u00f6ntemdir.  Di\u011fer y\u00f6ntemler genellikle daha karma\u015f\u0131k ve performans a\u00e7\u0131s\u0131ndan daha az verimlidir.<\/p>\n<p>2. <strong>Negatif say\u0131lar\u0131 nas\u0131l ba\u015ftan s\u0131f\u0131rlarla doldurabilirim?<\/strong>  Negatif say\u0131lar\u0131 ba\u015ftan s\u0131f\u0131rlarla doldurmak i\u00e7in, <code class=\"language-\">to_char<\/code> fonksiyonunda uygun format \u015fablonunu kullanman\u0131z ve negatif i\u015faretin i\u015flenmesini sa\u011flaman\u0131z gerekir.<\/p>\n<p>3. <strong>\u00c7ok b\u00fcy\u00fck say\u0131lar i\u00e7in performans nas\u0131l iyile\u015ftirilebilir?<\/strong>  \u00c7ok b\u00fcy\u00fck say\u0131lar i\u00e7in, veritaban\u0131 indeksleme stratejilerini optimize etmek ve gerekti\u011finde par\u00e7alama (partitioning) tekniklerini kullanmak performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.<\/p>\n<p>4. <strong>Farkl\u0131 veri tipleri i\u00e7in <code class=\"language-\">to_char<\/code> fonksiyonu nas\u0131l kullan\u0131l\u0131r?<\/strong>  <code class=\"language-\">to_char<\/code> fonksiyonu, say\u0131sal veri tipleri (INTEGER, NUMERIC, BIGINT vb.) i\u00e7in kullan\u0131labilir.  Ancak, metinsel veri tiplerine uygulanmas\u0131 farkl\u0131 bir sonu\u00e7 verecektir.<\/p>\n<p>5. <strong><code class=\"language-\">FM<\/code> \u00f6nekinin amac\u0131 nedir?<\/strong>  <code class=\"language-\">FM<\/code> \u00f6neki, formatlama i\u015fleminde ba\u015ftaki bo\u015fluklar\u0131 kald\u0131r\u0131r ve say\u0131n\u0131n ba\u015ftan s\u0131f\u0131rlarla doldurulmas\u0131n\u0131 sa\u011flar.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Say\u0131lar\u0131 Ba\u015ftan S\u0131f\u0131rlarla Doldurma PostgreSQL veritaban\u0131n\u0131zda say\u0131sal verileri i\u015flerken, \u00f6zellikle raporlama veya d\u0131\u015f sistemlerle entegrasyon s\u0131ras\u0131nda,&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-26906","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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