{"id":27565,"date":"2025-08-15T18:15:24","date_gmt":"2025-08-15T15:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/"},"modified":"2025-08-15T18:15:24","modified_gmt":"2025-08-15T15:15:24","slug":"postgresql-sayilari-en-yakin-ona-cevirebilme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/","title":{"rendered":"PostgreSQL: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme"},"content":{"rendered":"<p># PostgreSQL&#8217;de Say\u0131lar\u0131 En Yak\u0131n 10&#8217;a Yuvarlama<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlaman\u0131z gereken bir durumla kar\u015f\u0131la\u015ft\u0131n\u0131z m\u0131? \u00d6rne\u011fin, bir e-ticaret platformunda sipari\u015f toplamlar\u0131n\u0131 onluk basama\u011fa g\u00f6re grupland\u0131rmak veya co\u011frafi verileri onluk koordinatlara yuvarlamak isteyebilirsiniz. Bu makalede, PostgreSQL&#8217;de say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlaman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc fonksiyonlar\u0131n\u0131 kullanarak 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 makale, PostgreSQL&#8217;de say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlamay\u0131 \u00f6\u011frenmek i\u00e7in kademeli bir yol haritas\u0131 sunar:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel <code class=\"language-\">ROUND()<\/code> fonksiyonu ile yuvarlama, basit kod \u00f6rnekleri.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat senaryolar\u0131, farkl\u0131 yuvarlama y\u00f6ntemleri, optimizasyon ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in optimizasyon stratejileri, s\u0131n\u0131r durumlar\u0131 (edge cases).<\/p>\n<p><strong>PostgreSQL&#8217;de Yuvarlama Kavramlar\u0131: Temel Bilgiler<\/strong><\/p>\n<p>PostgreSQL, say\u0131sal de\u011ferleri yuvarlamak i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  En yayg\u0131n kullan\u0131lan fonksiyon <code class=\"language-\">ROUND()<\/code>&#8216;dur.  Bu fonksiyon, bir say\u0131y\u0131 belirtilen ondal\u0131k basama\u011fa yuvarlar. Ancak, en yak\u0131n 10&#8217;a yuvarlamak i\u00e7in biraz daha farkl\u0131 bir yakla\u015f\u0131m kullanmam\u0131z gerekir.  Temel olarak, say\u0131y\u0131 10&#8217;a b\u00f6l\u00fcp, sonucu tekrar 10 ile \u00e7arparak yuvarlamay\u0131 ger\u00e7ekle\u015ftiririz. Bu i\u015flem, say\u0131n\u0131n onluk basama\u011f\u0131n\u0131 koruyarak, birler basama\u011f\u0131n\u0131 yuvarlar.  \u00d6rne\u011fin, 23 say\u0131s\u0131 20&#8217;ye, 27 say\u0131s\u0131 ise 30&#8217;a yuvarlan\u0131r.  Bu i\u015flemde, 5&#8217;ten b\u00fcy\u00fck say\u0131lar yukar\u0131, 5&#8217;ten k\u00fc\u00e7\u00fck veya e\u015fit say\u0131lar a\u015fa\u011f\u0131 yuvarlan\u0131r.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r? En Yak\u0131n 10&#8217;a Yuvarlama: Ad\u0131m Ad\u0131m Uygulama<\/strong><\/p>\n<p>En yak\u0131n 10&#8217;a yuvarlaman\u0131n en basit yolu, <code class=\"language-\">ROUND()<\/code> fonksiyonunu birlikte kullanmakt\u0131r. \u0130\u015fte ad\u0131m ad\u0131m bir yakla\u015f\u0131m:<\/p>\n<p>1. <strong>Say\u0131y\u0131 10&#8217;a b\u00f6l\u00fcn:<\/strong>  Bu ad\u0131m, ondal\u0131k basama\u011f\u0131 elde etmemizi sa\u011flar.<br \/>\n2. <strong><code class=\"language-\">ROUND()<\/code> fonksiyonunu kullanarak sonucu yuvarlay\u0131n:<\/strong>  Bu ad\u0131m, ondal\u0131k k\u0131sm\u0131 en yak\u0131n tam say\u0131ya yuvarlar.<br \/>\n3. <strong>Sonucu 10 ile \u00e7arp\u0131n:<\/strong>  Bu ad\u0131m, yuvarlanm\u0131\u015f say\u0131y\u0131 tekrar onluk basama\u011fa getirir.<\/p>\n<p>\u0130\u015fte PostgreSQL kodu:<\/p>\n<pre class=\"language-sql\"><code>SELECT ROUND(sayi \/ 10.0) * 10 AS yuvarlanmis_sayi\nFROM sayilar;<\/code><\/pre>\n<p>Burada <code class=\"language-\">sayilar<\/code> tablosu, <code class=\"language-\">sayi<\/code> adl\u0131 bir say\u0131sal s\u00fctun i\u00e7ermektedir.  <code class=\"language-\">10.0<\/code> kullan\u0131m\u0131, ondal\u0131kl\u0131 b\u00f6lme i\u015flemi yapmam\u0131z\u0131 sa\u011flar ve daha do\u011fru sonu\u00e7lar verir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: E-Ticaret Sipari\u015f Toplamlar\u0131<\/strong><\/p>\n<p>Bir e-ticaret sitesi d\u00fc\u015f\u00fcn\u00fcn.  Her g\u00fcn y\u00fczlerce sipari\u015f al\u0131yorsunuz ve bu sipari\u015flerin toplam tutarlar\u0131n\u0131 onluk basama\u011fa g\u00f6re grupland\u0131rmak istiyorsunuz.  Bu, sat\u0131\u015f analizleri i\u00e7in olduk\u00e7a faydal\u0131 olacakt\u0131r.  Yukar\u0131daki SQL sorgusunu kullanarak, her sipari\u015fin toplam tutar\u0131n\u0131 en yak\u0131n 10&#8217;a yuvarlayabilir ve bu verileri analiz edebilirsiniz.<\/p>\n<p>\u00d6rne\u011fin, <code class=\"language-\">siparisler<\/code> adl\u0131 bir tablonuz oldu\u011funu ve bu tablonun <code class=\"language-\">toplam_tutar<\/code> adl\u0131 bir s\u00fctunu oldu\u011funu varsayal\u0131m.  A\u015fa\u011f\u0131daki sorgu, her sipari\u015fin toplam tutar\u0131n\u0131 en yak\u0131n 10&#8217;a yuvarlar:<\/p>\n<pre class=\"language-sql\"><code>SELECT siparis_id, ROUND(toplam_tutar \/ 10.0) * 10 AS yuvarlanmis_toplam\nFROM siparisler;<\/code><\/pre>\n<p><strong>Performans Optimizasyonu: B\u00fcy\u00fck Veri K\u00fcmeleri i\u00e7in \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, performans optimizasyonu kritik \u00f6neme sahiptir.  <code class=\"language-\">ROUND()<\/code> fonksiyonu genellikle olduk\u00e7a h\u0131zl\u0131d\u0131r, ancak \u00e7ok b\u00fcy\u00fck tablolarda bile performans\u0131 etkileyebilecek durumlar olabilir.  Bu t\u00fcr durumlarda, indeksleme ve uygun veri tiplerinin kullan\u0131m\u0131 performans\u0131 art\u0131rabilir.  Ayr\u0131ca, gereksiz hesaplamalar\u0131 \u00f6nlemek i\u00e7in sorgular\u0131 optimize etmek \u00f6nemlidir.  \u00d6rne\u011fin, <code class=\"language-\">WHERE<\/code> ko\u015fulu kullanarak yaln\u0131zca gerekli verileri filtreleyebilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler: S\u0131n\u0131r Durumlar\u0131 ve Alternatif Y\u00f6ntemler<\/strong><\/p>\n<p>Baz\u0131 durumlarda, standart <code class=\"language-\">ROUND()<\/code> fonksiyonu beklenmedik sonu\u00e7lar \u00fcretebilir.  \u00d6rne\u011fin, negatif say\u0131larla \u00e7al\u0131\u015f\u0131rken dikkatli olmak gerekir.  Negatif say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlarken, sonu\u00e7lar\u0131n do\u011fru oldu\u011fundan emin olmak i\u00e7in ek kontroller yapman\u0131z gerekebilir.<\/p>\n<p>Alternatif bir yakla\u015f\u0131m olarak, <code class=\"language-\">CASE<\/code> ifadesi kullanarak farkl\u0131 ko\u015fullar i\u00e7in \u00f6zel yuvarlama kurallar\u0131 belirleyebilirsiniz. Bu, daha karma\u015f\u0131k yuvarlama gereksinimleri i\u00e7in faydal\u0131 olabilir.  \u00d6rne\u011fin, 5&#8217;ten b\u00fcy\u00fck say\u0131lar\u0131 her zaman yukar\u0131 yuvarlamak isteyebilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Yuvarlama:  S\u0131k\u00e7a Sorulan Sorular<\/strong><\/p>\n<p>* <strong>Negatif say\u0131lar\u0131 nas\u0131l yuvarlar\u0131m?<\/strong>  <code class=\"language-\">ROUND()<\/code> fonksiyonu negatif say\u0131lar i\u00e7in de \u00e7al\u0131\u015f\u0131r, ancak sonu\u00e7lar\u0131n beklenildi\u011fi gibi olup olmad\u0131\u011f\u0131n\u0131 kontrol etmeniz gerekebilir.  Gerekirse, <code class=\"language-\">CASE<\/code> ifadesi kullanarak \u00f6zel kurallar belirleyebilirsiniz.<\/p>\n<p>* <strong>Onluk basamaktan farkl\u0131 bir basama\u011fa nas\u0131l yuvarlar\u0131m?<\/strong>  <code class=\"language-\">ROUND(sayi \/ 100.0) * 100<\/code> gibi, b\u00f6lme ve \u00e7arpma i\u015flemlerini de\u011fi\u015ftirerek farkl\u0131 basamaklara yuvarlayabilirsiniz.<\/p>\n<p>* <strong>Yuvarlama i\u015flemini bir fonksiyon olarak nas\u0131l tan\u0131mlar\u0131m?<\/strong>  PostgreSQL&#8217;de, <code class=\"language-\">CREATE FUNCTION<\/code> komutunu kullanarak kendi yuvarlama fonksiyonunuzu olu\u015fturabilirsiniz.  Bu, kodunuzun okunabilirli\u011fini ve yeniden kullan\u0131labilirli\u011fini art\u0131racakt\u0131r.<\/p>\n<p>* <strong>Yuvarlama i\u015fleminin do\u011frulu\u011fu nas\u0131l kontrol edilir?<\/strong>  Test verileri kullanarak, beklenen sonu\u00e7larla kar\u015f\u0131la\u015ft\u0131rma yaparak yuvarlama i\u015fleminin do\u011frulu\u011funu kontrol edebilirsiniz.<\/p>\n<p>* <strong>Performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  \u0130ndeksleme, uygun veri tiplerinin se\u00e7imi ve sorgular\u0131n optimizasyonu performans\u0131 art\u0131rabilir.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, daha geli\u015fmi\u015f optimizasyon tekniklerini ara\u015ft\u0131rman\u0131z gerekebilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlaman\u0131n \u00e7e\u015fitli y\u00f6ntemlerini ele ald\u0131.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar farkl\u0131 teknikler ve ger\u00e7ek d\u00fcnya \u00f6rnekleri g\u00f6sterildi.  Performans optimizasyonu ve s\u0131n\u0131r durumlar\u0131 gibi \u00f6nemli noktalara da de\u011finildi.  Umar\u0131m bu bilgiler, PostgreSQL veritaban\u0131n\u0131zda say\u0131lar\u0131 yuvarlama i\u015flemlerini daha verimli bir \u015fekilde ger\u00e7ekle\u015ftirmenize yard\u0131mc\u0131 olur.  Daha fazla bilgi i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Say\u0131lar\u0131 En Yak\u0131n 10&#8217;a Yuvarlama PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, say\u0131lar\u0131 en yak\u0131n 10&#8217;a yuvarlaman\u0131z gereken bir durumla&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-27565","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: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme<\/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-sayilari-en-yakin-ona-cevirebilme\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-15T15:15:24+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-sayilari-en-yakin-ona-cevirebilme\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme\",\"datePublished\":\"2025-08-15T15:15:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\"},\"wordCount\":930,\"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-sayilari-en-yakin-ona-cevirebilme\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\",\"name\":\"PostgreSQL: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-08-15T15:15:24+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayilari-en-yakin-ona-cevirebilme\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Say\u0131lar\u0131 En Yak\u0131n Ona \u00c7evirebilme\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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