{"id":26385,"date":"2025-07-24T09:15:23","date_gmt":"2025-07-24T06:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/"},"modified":"2025-07-24T09:15:23","modified_gmt":"2025-07-24T06:15:23","slug":"postgresql-bir-ayda-kac-gun-oldugunu-bulma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/","title":{"rendered":"PostgreSQL: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Bir Ay\u0131n G\u00fcn Say\u0131s\u0131n\u0131 Nas\u0131l Buluruz?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, belirli bir tarihin ait oldu\u011fu ay\u0131n ka\u00e7 g\u00fcn s\u00fcrd\u00fc\u011f\u00fcn\u00fc bilmeniz gereken durumlarla s\u0131k\u00e7a kar\u015f\u0131la\u015fabilirsiniz. \u00d6rne\u011fin, ayl\u0131k raporlama, faturaland\u0131rma i\u015flemleri veya d\u00f6nemsel analizler yaparken bu bilgiye ihtiya\u00e7 duyabilirsiniz.  Bu makalede, PostgreSQL kullanarak bir ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 bulman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve olas\u0131 sorunlar\u0131 ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  Bu rehber sayesinde, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes PostgreSQL&#8217;de tarih i\u015flemlerini daha etkin bir \u015fekilde y\u00f6netebilir.<\/p>\n<p><strong>PostgreSQL Tarih Fonksiyonlar\u0131na Giri\u015f<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman i\u015flemleri i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Bu fonksiyonlar, tarih verilerinin i\u015flenmesini ve manip\u00fcle edilmesini kolayla\u015ft\u0131r\u0131r. Bir ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 bulmak i\u00e7in <code class=\"language-\">EXTRACT<\/code> ve <code class=\"language-\">DATE_TRUNC<\/code> gibi fonksiyonlar\u0131 kullanaca\u011f\u0131z.  <code class=\"language-\">EXTRACT<\/code> fonksiyonu, tarih ve zaman verilerinden belirli bile\u015fenleri (\u00f6rne\u011fin, ay, g\u00fcn, y\u0131l) ay\u0131klamam\u0131za olanak tan\u0131r.  <code class=\"language-\">DATE_TRUNC<\/code> ise, bir tarih de\u011ferini belirli bir zaman birimine (\u00f6rne\u011fin, ay, y\u0131l) yuvarlamam\u0131za yard\u0131mc\u0131 olur.  Bu fonksiyonlar\u0131 anlamak, bir ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 do\u011fru ve verimli bir \u015fekilde hesaplaman\u0131n temelini olu\u015fturur.  Tarih i\u015flemlerine dair daha detayl\u0131 bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n web sitesini](https:\/\/fatihsoysal.com) ziyaret etmenizi tavsiye ederim.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131: Bir Ay\u0131n G\u00fcn Say\u0131s\u0131n\u0131 Bulma<\/strong><\/p>\n<p>Bu b\u00f6l\u00fcmde, PostgreSQL&#8217;de bir ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 bulmay\u0131 ad\u0131m ad\u0131m \u00f6\u011frenece\u011fiz.  \u00dc\u00e7 farkl\u0131 seviyede ilerleyece\u011fiz: Yeni Ba\u015flayan, Orta ve \u0130leri D\u00fczey.<\/p>\n<p><strong># Yeni Ba\u015flayan: Temel Y\u00f6ntem ve Basit Kod \u00d6rne\u011fi<\/strong><\/p>\n<p>Yeni ba\u015flayanlar i\u00e7in en basit y\u00f6ntem, <code class=\"language-\">EXTRACT<\/code> fonksiyonunu kullanarak ay\u0131n numaras\u0131n\u0131 tespit etmek ve ard\u0131ndan bir <code class=\"language-\">CASE<\/code> deyimi ile her ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 belirlemektir.  Bu y\u00f6ntem, \u015fubattaki 28 veya 29 g\u00fcn gibi istisnai durumlar\u0131 da ele al\u0131r.<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION get_days_in_month(p_date date)\nRETURNS integer AS $$\nDECLARE\n  v_days integer;\nBEGIN\n  CASE EXTRACT(MONTH FROM p_date)\n    WHEN 2 THEN\n      v_days := CASE WHEN EXTRACT(YEAR FROM p_date) % 4 = 0 AND (EXTRACT(YEAR FROM p_date) % 100 != 0 OR EXTRACT(YEAR FROM p_date) % 400 = 0) THEN 29 ELSE 28 END;\n    WHEN 4, 6, 9, 11 THEN v_days := 30;\n    ELSE v_days := 31;\n  END CASE;\n  RETURN v_days;\nEND;\n$$ LANGUAGE plpgsql;\n\nSELECT get_days_in_month('2024-02-15'); -- 29 (2024 art\u0131k y\u0131l)\nSELECT get_days_in_month('2023-02-15'); -- 28 (2023 art\u0131k y\u0131l de\u011fil)\nSELECT get_days_in_month('2023-04-15'); -- 30<\/code><\/pre>\n<p>Bu fonksiyon, verilen bir tarih i\u00e7in ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.  <code class=\"language-\">CASE<\/code> ifadesi, \u015fubat ay\u0131 i\u00e7in art\u0131k y\u0131l kontrol\u00fcn\u00fc de i\u00e7erir.  Bu basit yakla\u015f\u0131m, temel anlay\u0131\u015f\u0131 kavramak i\u00e7in idealdir.<\/p>\n<p><strong># Orta Seviye: Ger\u00e7ek Hayat \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek bir senaryo ele alal\u0131m.  Bir e-ticaret \u015firketinin, her ay\u0131n sat\u0131\u015f rakamlar\u0131n\u0131 \u00f6zetleyen bir rapor olu\u015fturmas\u0131 gerekti\u011fini varsayal\u0131m.  Bu rapor, her ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 da i\u00e7ermelidir.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    EXTRACT(YEAR FROM sales_date) AS sales_year,\n    EXTRACT(MONTH FROM sales_date) AS sales_month,\n    get_days_in_month(sales_date) AS days_in_month,\n    SUM(sales_amount) AS total_sales\nFROM\n    sales_table\nGROUP BY\n    sales_year, sales_month, days_in_month\nORDER BY\n    sales_year, sales_month;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">sales_table<\/code> tablosundaki verileri ay ve y\u0131la g\u00f6re gruplayarak, her ay\u0131n toplam sat\u0131\u015f\u0131n\u0131 ve o ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 g\u00f6sterir.  Performans\u0131 art\u0131rmak i\u00e7in, <code class=\"language-\">get_days_in_month<\/code> fonksiyonunu \u00f6nceden hesaplay\u0131p bir ge\u00e7ici tabloya kaydedebilir ve daha sonra bu ge\u00e7ici tabloyu ana sorguda kullanabiliriz.  Bu, fonksiyon \u00e7a\u011fr\u0131lar\u0131n\u0131n say\u0131s\u0131n\u0131 azaltarak performans\u0131 iyile\u015ftirir.<\/p>\n<p><strong># \u0130leri D\u00fczey: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>Daha b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans kritik hale gelir.  <code class=\"language-\">get_days_in_month<\/code> fonksiyonunun performans\u0131n\u0131 analiz etmek ve iyile\u015ftirmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabiliriz.  Ayr\u0131ca, <code class=\"language-\">date_part<\/code> fonksiyonunun kullan\u0131m\u0131 performans a\u00e7\u0131s\u0131ndan daha verimli olabilir.<\/p>\n<pre class=\"language-sql\"><code>SELECT date_part('day', (date_trunc('month', '2024-02-15') + interval '1 month') - interval '1 day'); --29<\/code><\/pre>\n<p>Bu yakla\u015f\u0131m, bir sonraki ay\u0131n ba\u015flang\u0131\u00e7 tarihinden bir g\u00fcn \u00e7\u0131kararak mevcut ay\u0131n son g\u00fcn\u00fcn\u00fc bulur ve <code class=\"language-\">date_part<\/code> fonksiyonuyla g\u00fcn say\u0131s\u0131n\u0131 elde eder.  Bu y\u00f6ntem, <code class=\"language-\">CASE<\/code> ifadelerini kullanmaktan daha h\u0131zl\u0131 olabilir.  Ayr\u0131ca, farkl\u0131 dillerdeki tarih formatlar\u0131n\u0131 ve olas\u0131 hatalar\u0131 (\u00f6rne\u011fin, ge\u00e7ersiz tarih de\u011ferleri) ele alarak kodun sa\u011flaml\u0131\u011f\u0131n\u0131 art\u0131rabiliriz.  Hata y\u00f6netimi ve istisnai durumlar\u0131n d\u00fczg\u00fcn bir \u015fekilde ele al\u0131nmas\u0131, uygulaman\u0131n g\u00fcvenilirli\u011fini art\u0131r\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih \u0130\u015flemlerini Optimize Etme<\/strong><\/p>\n<p>PostgreSQL&#8217;de tarih i\u015flemlerinin performans\u0131n\u0131 optimize etmek i\u00e7in birka\u00e7 \u00f6nemli ipucu \u015funlard\u0131r:<\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong> Tarih s\u00fctunlar\u0131na uygun indeksler eklemek, sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>Fonksiyonel \u0130ndeksler:<\/strong> Karma\u015f\u0131k tarih hesaplamalar\u0131 i\u00e7eren fonksiyonlar\u0131n sonu\u00e7lar\u0131n\u0131 indekslemek, performans\u0131 iyile\u015ftirebilir.<br \/>\n* <strong>Ge\u00e7ici Tablolar:<\/strong> B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde i\u015flem yaparken, ara sonu\u00e7lar\u0131 ge\u00e7ici tablolara kaydetmek, sorgu s\u00fcresini k\u0131saltabilir.<br \/>\n* <strong>\u0130\u015flem S\u0131ras\u0131:<\/strong>  Sorgularda i\u015flem s\u0131ras\u0131n\u0131 optimize etmek, gereksiz hesaplamalar\u0131 \u00f6nler.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de bir ay\u0131n g\u00fcn say\u0131s\u0131n\u0131 bulman\u0131n farkl\u0131 y\u00f6ntemlerini inceledik.  Yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi \u015fekilde, ad\u0131m ad\u0131m bir rehber sunduk.  Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve performans optimizasyon teknikleri ile konuyu peki\u015ftirdik.  PostgreSQL&#8217;in sundu\u011fu g\u00fc\u00e7l\u00fc tarih fonksiyonlar\u0131n\u0131 kullanarak, veritaban\u0131n\u0131zdaki tarih i\u015flemlerini daha verimli ve g\u00fcvenilir bir \u015fekilde y\u00f6netebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Art\u0131k y\u0131llar nas\u0131l ele al\u0131n\u0131yor?<\/strong>  <code class=\"language-\">CASE<\/code> ifadesi veya <code class=\"language-\">date_part<\/code> ile art\u0131k y\u0131llar\u0131n kontrol\u00fc sa\u011flanarak do\u011fru g\u00fcn say\u0131s\u0131 hesaplan\u0131yor.<br \/>\n2. <strong>Performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong> \u0130ndeksleme, fonksiyonel indeksler ve ge\u00e7ici tablolar kullanarak performans\u0131 art\u0131rabilirsiniz.<br \/>\n3. <strong>Ge\u00e7ersiz tarih de\u011ferleri nas\u0131l ele al\u0131nmal\u0131?<\/strong>  Hata y\u00f6netimi mekanizmalar\u0131 ekleyerek ge\u00e7ersiz tarih de\u011ferlerini kontrol edebilir ve uygun hata mesajlar\u0131 verebilirsiniz.<br \/>\n4. <strong>Farkl\u0131 tarih formatlar\u0131 nas\u0131l i\u015flenir?<\/strong>  <code class=\"language-\">TO_DATE<\/code> fonksiyonu kullan\u0131larak farkl\u0131 tarih formatlar\u0131 PostgreSQL&#8217;e uygun hale getirilebilir.<br \/>\n5. <strong>Daha karma\u015f\u0131k tarih hesaplamalar\u0131 nas\u0131l yap\u0131l\u0131r?<\/strong> PostgreSQL&#8217;in sa\u011flad\u0131\u011f\u0131 di\u011fer tarih ve zaman fonksiyonlar\u0131n\u0131 kullanarak daha karma\u015f\u0131k hesaplamalar yap\u0131labilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Bir Ay\u0131n G\u00fcn Say\u0131s\u0131n\u0131 Nas\u0131l Buluruz? PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, belirli bir tarihin ait oldu\u011fu ay\u0131n ka\u00e7&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-26385","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: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma<\/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-bir-ayda-kac-gun-oldugunu-bulma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-24T06:15:23+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=\"6 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma\",\"datePublished\":\"2025-07-24T06:15:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\"},\"wordCount\":934,\"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-bir-ayda-kac-gun-oldugunu-bulma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\",\"name\":\"PostgreSQL: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-24T06:15:23+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-ayda-kac-gun-oldugunu-bulma\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Bir Ayda Ka\u00e7 G\u00fcn Oldu\u011funu Bulma\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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