{"id":26866,"date":"2025-08-02T00:15:24","date_gmt":"2025-08-01T21:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-sifira-bolme-hatasindan-nasil-kacinilir-orneklerle\/"},"modified":"2025-08-02T00:15:24","modified_gmt":"2025-08-01T21:15:24","slug":"postgresqlde-sifira-bolme-hatasindan-nasil-kacinilir-orneklerle","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-sifira-bolme-hatasindan-nasil-kacinilir-orneklerle\/","title":{"rendered":"PostgreSQL&#8217;de S\u0131f\u0131ra B\u00f6lme Hatas\u0131ndan Nas\u0131l Ka\u00e7\u0131n\u0131l\u0131r (\u00d6rneklerle)"},"content":{"rendered":"<p># PostgreSQL&#8217;de S\u0131f\u0131r B\u00f6lmesine Nas\u0131l Engel Olunur? (\u00d6rneklerle)<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda bir hesaplama yaparken, beklenmedik bir s\u0131f\u0131r b\u00f6lme hatas\u0131yla kar\u015f\u0131la\u015fmak can s\u0131k\u0131c\u0131 olabilir. Bu hata, uygulaman\u0131z\u0131n \u00e7\u00f6kmesine, yanl\u0131\u015f sonu\u00e7lara yol a\u00e7mas\u0131na ve veritaban\u0131 performans\u0131n\u0131 d\u00fc\u015f\u00fcrmesine neden olabilir.  Bu makalede, PostgreSQL&#8217;de s\u0131f\u0131r b\u00f6lmesine nas\u0131l engel olunaca\u011f\u0131n\u0131, farkl\u0131 senaryolar\u0131 ve \u00e7\u00f6z\u00fcm yollar\u0131n\u0131 ad\u0131m ad\u0131m, yeni ba\u015flayanlardan uzmanlara kadar herkesin anlayabilece\u011fi \u015fekilde ele alaca\u011f\u0131z.  S\u0131f\u0131ra b\u00f6lme sorununu \u00e7\u00f6zmek i\u00e7in kullanabilece\u011finiz farkl\u0131 teknikleri, performans optimizasyon ipu\u00e7lar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini inceleyerek, veritaban\u0131n\u0131z\u0131n sa\u011flaml\u0131\u011f\u0131n\u0131 ve performans\u0131n\u0131 art\u0131raca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makaleyi, bilgi seviyenize g\u00f6re takip edebilirsiniz:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> Temel kavramlar, basit kod \u00f6rnekleri ve ad\u0131m ad\u0131m a\u00e7\u0131klamalar.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat \u00f6rnekleri, optimizasyon ipu\u00e7lar\u0131 ve daha karma\u015f\u0131k senaryolar.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, edge case&#8217;ler ve geli\u015fmi\u015f \u00e7\u00f6z\u00fcm y\u00f6ntemleri.<\/p>\n<p><strong>PostgreSQL&#8217;de S\u0131f\u0131r B\u00f6lme Hatas\u0131 Nedir?<\/strong><\/p>\n<p>PostgreSQL, t\u0131pk\u0131 di\u011fer programlama dilleri gibi, s\u0131f\u0131ra b\u00f6lme i\u015flemini desteklemez.  Bu i\u015flem, matematiksel olarak tan\u0131ms\u0131zd\u0131r ve bir hata \u00fcretir.  Bu hata, genellikle bir SQL sorgusu i\u00e7inde b\u00f6lme i\u015flemi ger\u00e7ekle\u015ftirilirken, paydan\u0131n s\u0131f\u0131r olmas\u0131 durumunda ortaya \u00e7\u0131kar.  \u00d6rne\u011fin, <code class=\"language-\">SELECT 10 \/ 0;<\/code> sorgusu bir hata verecektir.  Bu hatan\u0131n sonu\u00e7lar\u0131, sorgunun ba\u015far\u0131s\u0131z olmas\u0131, uygulaman\u0131z\u0131n \u00e7\u00f6kmesi veya yanl\u0131\u015f sonu\u00e7lar\u0131n \u00fcretilmesi olabilir.  Bu nedenle, s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nlemek, veritaban\u0131 uygulamalar\u0131n\u0131n g\u00fcvenilirli\u011fi ve sa\u011flaml\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<p><strong>S\u0131f\u0131r B\u00f6lmeyi \u00d6nlemenin Temel Y\u00f6ntemleri: <code class=\"language-\">CASE<\/code> \u0130fadesi ve <code class=\"language-\">NULLIF<\/code> Fonksiyonu<\/strong><\/p>\n<p>S\u0131f\u0131r b\u00f6lme sorununu \u00e7\u00f6zmenin en yayg\u0131n ve basit y\u00f6ntemleri <code class=\"language-\">CASE<\/code> ifadesi ve <code class=\"language-\">NULLIF<\/code> fonksiyonudur.  Bu y\u00f6ntemler, paydan\u0131n s\u0131f\u0131r olup olmad\u0131\u011f\u0131n\u0131 kontrol ederek, s\u0131f\u0131r olmas\u0131 durumunda farkl\u0131 bir davran\u0131\u015f belirlemenizi sa\u011flar.<\/p>\n<p><strong>Yeni Ba\u015flayanlar i\u00e7in Ad\u0131m Ad\u0131m A\u00e7\u0131klama (CASE \u0130fadesi):<\/strong><\/p>\n<p>Bir <code class=\"language-\">CASE<\/code> ifadesi kullanarak, paydan\u0131n s\u0131f\u0131r olup olmad\u0131\u011f\u0131n\u0131 kontrol edebilir ve s\u0131f\u0131r ise farkl\u0131 bir de\u011fer d\u00f6nd\u00fcrebilirsiniz.  \u00d6rne\u011fin, a\u015fa\u011f\u0131daki sorgu, <code class=\"language-\">quantity<\/code> s\u0131f\u0131rsa <code class=\"language-\">average_price<\/code> yerine 0 d\u00f6nd\u00fcr\u00fcr:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    CASE\n        WHEN quantity = 0 THEN 0\n        ELSE price \/ quantity\n    END AS average_price\nFROM\n    products;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">quantity<\/code> s\u00fctunu s\u0131f\u0131r olan sat\u0131rlar i\u00e7in <code class=\"language-\">average_price<\/code> s\u00fctununa 0 de\u011ferini atayarak s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nler.  Di\u011fer sat\u0131rlar i\u00e7in ise normal b\u00f6lme i\u015flemi ger\u00e7ekle\u015ftirilir.<\/p>\n<p><strong>Yeni Ba\u015flayanlar i\u00e7in Ad\u0131m Ad\u0131m A\u00e7\u0131klama (NULLIF Fonksiyonu):<\/strong><\/p>\n<p><code class=\"language-\">NULLIF<\/code> fonksiyonu, iki de\u011feri kar\u015f\u0131la\u015ft\u0131r\u0131r ve e\u015fitlerse <code class=\"language-\">NULL<\/code> d\u00f6nd\u00fcr\u00fcr.  Bu fonksiyonu, paydan\u0131n s\u0131f\u0131r olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek ve s\u0131f\u0131r ise <code class=\"language-\">NULL<\/code> d\u00f6nd\u00fcrmek i\u00e7in kullanabilirsiniz.  Daha sonra, <code class=\"language-\">COALESCE<\/code> fonksiyonu ile <code class=\"language-\">NULL<\/code> de\u011ferini istedi\u011finiz bir de\u011ferle (\u00f6rne\u011fin 0 veya 1) de\u011fi\u015ftirebilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    COALESCE(price \/ NULLIF(quantity, 0), 0) AS average_price\nFROM\n    products;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">quantity<\/code> s\u00fctunu s\u0131f\u0131r ise <code class=\"language-\">NULLIF<\/code> fonksiyonu <code class=\"language-\">NULL<\/code> d\u00f6nd\u00fcr\u00fcr ve <code class=\"language-\">COALESCE<\/code> fonksiyonu bunu 0 ile de\u011fi\u015ftirir.  Bu sayede s\u0131f\u0131r b\u00f6lme hatas\u0131 \u00f6nlenir.<\/p>\n<p><strong>Ger\u00e7ek Hayatta S\u0131f\u0131r B\u00f6lme Sorunlar\u0131 ve \u00c7\u00f6z\u00fcmleri: Vaka Analizleri<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek d\u00fcnya senaryolar\u0131nda s\u0131f\u0131r b\u00f6lme sorunlar\u0131na ve bunlar\u0131n nas\u0131l \u00e7\u00f6z\u00fclece\u011fine bakal\u0131m.<\/p>\n<p><strong>Vaka 1: Ortalama Hesaplama:<\/strong><\/p>\n<p>Bir e-ticaret sitesinin \u00fcr\u00fcn yorumlar\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcn.  Her \u00fcr\u00fcn i\u00e7in ortalama puan\u0131 hesaplamak istiyoruz.  Ancak, baz\u0131 \u00fcr\u00fcnlerin hi\u00e7 yorumu olmayabilir.  Bu durumda, s\u0131f\u0131r b\u00f6lme hatas\u0131yla kar\u015f\u0131la\u015fabiliriz.<\/p>\n<pre class=\"language-sql\"><code>SELECT product_id, SUM(rating) \/ COUNT(*) AS average_rating\nFROM reviews\nGROUP BY product_id;<\/code><\/pre>\n<p>Bu sorgu, yorum say\u0131s\u0131 s\u0131f\u0131r olan \u00fcr\u00fcnler i\u00e7in hata verecektir.  Bunun yerine <code class=\"language-\">CASE<\/code> veya <code class=\"language-\">NULLIF<\/code> kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT product_id, \n       CASE \n           WHEN COUNT(*) = 0 THEN 0 \n           ELSE SUM(rating) \/ COUNT(*) \n       END AS average_rating\nFROM reviews\nGROUP BY product_id;<\/code><\/pre>\n<p><strong>Vaka 2:  Y\u00fczde Hesaplama:<\/strong><\/p>\n<p>Bir pazarlama kampanyas\u0131n\u0131n ba\u015far\u0131s\u0131n\u0131 \u00f6l\u00e7mek i\u00e7in d\u00f6n\u00fc\u015f\u00fcm oran\u0131n\u0131 hesaplayal\u0131m.  D\u00f6n\u00fc\u015f\u00fcm say\u0131s\u0131 s\u0131f\u0131r ise s\u0131f\u0131r b\u00f6lme hatas\u0131 olu\u015fur.<\/p>\n<pre class=\"language-sql\"><code>SELECT (CAST(conversions AS FLOAT) \/ impressions) * 100 AS conversion_rate\nFROM campaign_data;<\/code><\/pre>\n<p><code class=\"language-\">NULLIF<\/code> kullanarak bu sorunu \u00e7\u00f6zebiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT COALESCE((CAST(conversions AS FLOAT) \/ NULLIF(impressions, 0)) * 100, 0) AS conversion_rate\nFROM campaign_data;<\/code><\/pre>\n<p><strong>\u0130leri D\u00fczey Teknikler: B\u00fcy\u00fck Veri K\u00fcmeleri ve Performans Optimizasyonu<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">CASE<\/code> ve <code class=\"language-\">NULLIF<\/code> kullan\u0131m\u0131 performans\u0131 etkileyebilir.  Bu durumlarda, daha verimli \u00e7\u00f6z\u00fcmler aramak gerekebilir.  \u00d6rne\u011fin, veritaban\u0131 indekslerini optimize ederek veya sorguyu yeniden yazarak performans\u0131 art\u0131rabilirsiniz.  Ayr\u0131ca,  PostgreSQL&#8217;in sundu\u011fu di\u011fer fonksiyonlar\u0131 da kullanabilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler ve \u00d6zel Durumlar<\/strong><\/p>\n<p>Baz\u0131 durumlarda, s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nlemek i\u00e7in daha karma\u015f\u0131k \u00e7\u00f6z\u00fcmler gerekebilir.  \u00d6rne\u011fin, paydan\u0131n \u00e7ok k\u00fc\u00e7\u00fck bir say\u0131 olmas\u0131 durumunda (\u00f6rne\u011fin, 0.00001), b\u00f6lme i\u015fleminin sonucu \u00e7ok b\u00fcy\u00fck bir say\u0131 olabilir ve bu da ba\u015fka sorunlara yol a\u00e7abilir.  Bu gibi durumlarda, paydan\u0131n bir e\u015fik de\u011ferinin alt\u0131nda olup olmad\u0131\u011f\u0131n\u0131 kontrol ederek, gerekli \u00f6nlemleri alabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de S\u0131f\u0131r B\u00f6lmeyi \u00d6nlemek \u0130\u00e7in \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>* <strong>Veri Do\u011frulama:<\/strong> Veri giri\u015fini do\u011frulayarak, paydan\u0131n s\u0131f\u0131r olmamas\u0131n\u0131 sa\u011flay\u0131n.  Bu, uygulaman\u0131z\u0131n \u00f6n ucunda veya veritaban\u0131 tetikleyicileri kullanarak yap\u0131labilir.<br \/>\n* <strong>Varsay\u0131lan De\u011ferler:<\/strong>  S\u00fctunlara varsay\u0131lan de\u011ferler atayarak, s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131n olu\u015fmas\u0131n\u0131 \u00f6nleyebilirsiniz.<br \/>\n* <strong>Sorgular\u0131 Optimize Etme:<\/strong>  Verimli sorgular yazarak, performans\u0131 art\u0131rabilir ve s\u0131f\u0131r b\u00f6lme hatas\u0131 riskini azaltabilirsiniz.  \u0130ndeksleri do\u011fru \u015fekilde kullanmak ve gereksiz i\u015flemlerden ka\u00e7\u0131nmak \u00f6nemlidir.<br \/>\n* <strong>Test Etme:<\/strong>  Uygulaman\u0131z\u0131 kapsaml\u0131 bir \u015fekilde test ederek, s\u0131f\u0131r b\u00f6lme hatas\u0131 gibi olas\u0131 hatalar\u0131 tespit edebilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nlemek, veritaban\u0131 uygulamalar\u0131n\u0131n g\u00fcvenilirli\u011fi ve performans\u0131 i\u00e7in \u00e7ok \u00f6nemlidir.  Bu makalede, s\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nlemenin farkl\u0131 y\u00f6ntemlerini, ger\u00e7ek d\u00fcnya \u00f6rneklerini ve performans optimizasyon ipu\u00e7lar\u0131n\u0131 inceledik.  <code class=\"language-\">CASE<\/code> ve <code class=\"language-\">NULLIF<\/code> fonksiyonlar\u0131 basit ve yayg\u0131n \u00e7\u00f6z\u00fcmler sunarken, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in daha geli\u015fmi\u015f teknikler gerekebilir.  Uygulaman\u0131z\u0131n ihtiya\u00e7lar\u0131na en uygun y\u00f6ntemi se\u00e7mek ve kapsaml\u0131 testler yapmak \u00f6nemlidir.  Daha fazla bilgi i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>S\u0131f\u0131r b\u00f6lme hatas\u0131 sadece b\u00f6lme i\u015flemlerinde mi olu\u015fur?<\/strong>  Hay\u0131r, s\u0131f\u0131r b\u00f6lme hatas\u0131, b\u00f6lme i\u015fleminin i\u00e7inde yer ald\u0131\u011f\u0131 di\u011fer matematiksel i\u015flemler s\u0131ras\u0131nda da olu\u015fabilir.<br \/>\n2. <strong><code class=\"language-\">CASE<\/code> ve <code class=\"language-\">NULLIF<\/code> aras\u0131ndaki fark nedir?<\/strong> <code class=\"language-\">CASE<\/code> daha genel ama\u00e7l\u0131 bir kontrol yap\u0131s\u0131d\u0131r, <code class=\"language-\">NULLIF<\/code> ise \u00f6zellikle iki de\u011ferin e\u015fit olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in tasarlanm\u0131\u015ft\u0131r.<br \/>\n3. <strong>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in en iyi y\u00f6ntem nedir?<\/strong> B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, sorguyu optimize etmek, indeksleri kullanmak ve verimli fonksiyonlar kullanmak \u00f6nemlidir.<br \/>\n4. <strong>S\u0131f\u0131r b\u00f6lme hatas\u0131n\u0131 \u00f6nlemek i\u00e7in ba\u015fka hangi teknikleri kullanabilirim?<\/strong> Veri do\u011frulama, varsay\u0131lan de\u011ferler ve hata y\u00f6netimi mekanizmalar\u0131 da kullan\u0131labilir.<br \/>\n5. <strong>S\u0131f\u0131r b\u00f6lme hatas\u0131 olu\u015ftu\u011funda ne olur?<\/strong>  Sorgunun ba\u015far\u0131s\u0131z olmas\u0131, uygulaman\u0131z\u0131n \u00e7\u00f6kmesi veya yanl\u0131\u015f sonu\u00e7lar\u0131n \u00fcretilmesi gibi sonu\u00e7lar do\u011furabilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de S\u0131f\u0131r B\u00f6lmesine Nas\u0131l Engel Olunur? (\u00d6rneklerle) PostgreSQL veritaban\u0131n\u0131zda bir hesaplama yaparken, beklenmedik bir s\u0131f\u0131r b\u00f6lme hatas\u0131yla&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-26866","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&#039;de S\u0131f\u0131ra B\u00f6lme Hatas\u0131ndan Nas\u0131l Ka\u00e7\u0131n\u0131l\u0131r (\u00d6rneklerle)<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta 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