{"id":25384,"date":"2025-07-05T15:17:33","date_gmt":"2025-07-05T12:17:33","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/"},"modified":"2025-07-05T15:17:33","modified_gmt":"2025-07-05T12:17:33","slug":"postgresql-gunun-sonunu-nasil-alinir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/","title":{"rendered":"PostgreSQL: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r"},"content":{"rendered":"<p># PostgreSQL&#8217;de G\u00fcn\u00fcn Sonunu Nas\u0131l Buluruz?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda g\u00fcn\u00fcn son an\u0131n\u0131 do\u011fru bir \u015fekilde belirlemek, zaman serisi verileri analiz ederken, g\u00fcnl\u00fck raporlar olu\u015ftururken veya zaman tabanl\u0131 i\u015f mant\u0131\u011f\u0131 uygularken kritik \u00f6neme sahiptir.  Yanl\u0131\u015f bir hesaplama, raporlar\u0131n\u0131zda \u00f6nemli hatalara ve yanl\u0131\u015f kararlara yol a\u00e7abilir. Bu makale, PostgreSQL kullanarak g\u00fcn\u00fcn sonunu bulman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ad\u0131m ad\u0131m a\u00e7\u0131klayarak, bu konuda uzmanla\u015fman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de Zaman ve Tarih \u0130\u015fleme Temelleri<\/strong><\/p>\n<p>PostgreSQL, <code class=\"language-\">timestamp<\/code> ve <code class=\"language-\">date<\/code> veri tipleriyle tarih ve zaman bilgilerini saklaman\u0131za olanak tan\u0131r.  <code class=\"language-\">timestamp<\/code> veri tipi hem tarih hem de saati i\u00e7erirken, <code class=\"language-\">date<\/code> veri tipi sadece tarihi tutar.  Bu makalede, \u00e7o\u011funlukla <code class=\"language-\">timestamp<\/code> veri tipi \u00fczerinde \u00e7al\u0131\u015faca\u011f\u0131z \u00e7\u00fcnk\u00fc g\u00fcn\u00fcn sonunu belirlerken saat bilgisi de \u00f6nemlidir.  <code class=\"language-\">timestamp without time zone<\/code> ve <code class=\"language-\">timestamp with time zone<\/code> aras\u0131ndaki fark\u0131 anlamak da \u00f6nemlidir.  <code class=\"language-\">with time zone<\/code> veri tipi, zaman dilimlerini dikkate al\u0131rken, <code class=\"language-\">without time zone<\/code> veri tipi yerel zaman\u0131 kullan\u0131r.  Zaman dilimi y\u00f6netimi, \u00f6zellikle k\u00fcresel verilerle \u00e7al\u0131\u015f\u0131yorsan\u0131z, \u00e7ok \u00f6nemlidir.  Do\u011fru zaman dilimi ayarlar\u0131n\u0131 yapmazsan\u0131z, beklenmedik sonu\u00e7lar elde edebilirsiniz.  Bu nedenle, uygulaman\u0131z\u0131n ihtiya\u00e7lar\u0131na en uygun veri tipini se\u00e7meniz gerekmektedir.<\/p>\n<p><strong>PostgreSQL&#8217;de G\u00fcn\u00fcn Sonunu Bulman\u0131n Temel Y\u00f6ntemi: <code class=\"language-\">date_trunc<\/code> Fonksiyonu<\/strong><\/p>\n<p>Yeni ba\u015flayanlar i\u00e7in en basit ve anla\u015f\u0131l\u0131r y\u00f6ntem, <code class=\"language-\">date_trunc<\/code> fonksiyonunu kullanmakt\u0131r. Bu fonksiyon, bir tarih ve zaman de\u011ferini belirli bir zaman birimine yuvarlar. G\u00fcn\u00fcn sonunu bulmak i\u00e7in, \u00f6nce g\u00fcn\u00fc <code class=\"language-\">date_trunc<\/code> ile bulur, sonra bir g\u00fcn ekler ve bir saniye \u00e7\u0131kar\u0131r\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p>* <strong>Ad\u0131m ad\u0131m a\u00e7\u0131klama:<\/strong>  <code class=\"language-\">date_trunc('day', timestamp)<\/code> fonksiyonu, verilen <code class=\"language-\">timestamp<\/code> de\u011ferini g\u00fcn\u00fcn ba\u015flang\u0131c\u0131na yuvarlar.  Bu de\u011fere 1 g\u00fcn ekleyip 1 saniye \u00e7\u0131kararak g\u00fcn\u00fcn son an\u0131n\u0131 elde ederiz.<\/p>\n<p>* <strong>Basit kod \u00f6rne\u011fi:<\/strong><\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('day', now()) + interval '1 day' - interval '1 second' AS end_of_day;<\/code><\/pre>\n<p>Bu kod, \u015fu anki zaman\u0131n g\u00fcn\u00fcn\u00fcn son an\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr. <code class=\"language-\">now()<\/code> fonksiyonu yerine, tarih ve zaman s\u00fctununuzu da kullanabilirsiniz. \u00d6rne\u011fin; <code class=\"language-\">tarih_sutunu<\/code> adl\u0131 bir s\u00fctununuz varsa:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('day', tarih_sutunu) + interval '1 day' - interval '1 second' AS end_of_day\nFROM\n    tablo_adi;<\/code><\/pre>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p>* <strong>Ger\u00e7ek hayat \u00f6rne\u011fi:<\/strong> Bir e-ticaret sitesi, g\u00fcnl\u00fck sat\u0131\u015f raporlar\u0131 olu\u015fturmak i\u00e7in g\u00fcn\u00fcn son an\u0131n\u0131 kullanabilir.  Bu rapor, g\u00fcn\u00fcn sonuna kadar yap\u0131lan t\u00fcm sat\u0131\u015flar\u0131 i\u00e7erecektir.<\/p>\n<p>* <strong>Optimizasyon ipu\u00e7lar\u0131:<\/strong>  <code class=\"language-\">date_trunc<\/code> fonksiyonu genellikle performans a\u00e7\u0131s\u0131ndan verimlidir.  Ancak, \u00e7ok b\u00fcy\u00fck tablolar \u00fczerinde \u00e7al\u0131\u015f\u0131yorsan\u0131z, indeksleme tekniklerini kullanman\u0131z performans\u0131 art\u0131rabilir. <code class=\"language-\">tarih_sutunu<\/code> \u00fczerinde bir indeks olu\u015fturmak sorgu h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.<\/p>\n<p><strong>\u0130leri D\u00fczey:<\/strong><\/p>\n<p>* <strong>Performans analizi:<\/strong>  \u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu performans\u0131n\u0131 analiz edip, indeksleme veya di\u011fer optimizasyon tekniklerini uygulayabilirsiniz.<\/p>\n<p>* <strong>Edge caseler:<\/strong>  Zaman dilimi ayarlar\u0131n\u0131n do\u011fru yap\u0131lmas\u0131 ve farkl\u0131 zaman dilimlerinden gelen verilerin i\u015flenmesinde dikkatli olunmal\u0131d\u0131r.  Yanl\u0131\u015f zaman dilimi ayarlar\u0131, g\u00fcn\u00fcn sonunun yanl\u0131\u015f hesaplanmas\u0131na yol a\u00e7abilir.  <code class=\"language-\">timestamp with time zone<\/code> kullan\u0131yorsan\u0131z, zaman dilimi farklar\u0131n\u0131 hesaba katman\u0131z \u00f6nemlidir.<\/p>\n<p><strong><code class=\"language-\">make_date<\/code> ve <code class=\"language-\">make_timestamp<\/code> Fonksiyonlar\u0131n\u0131 Kullanarak G\u00fcn\u00fcn Sonunu Bulmak<\/strong><\/p>\n<p>Daha fazla kontrol sa\u011flayan bir di\u011fer y\u00f6ntem ise <code class=\"language-\">make_date<\/code> ve <code class=\"language-\">make_timestamp<\/code> fonksiyonlar\u0131n\u0131 kullanmakt\u0131r. Bu fonksiyonlar, tarih ve zaman de\u011ferlerini par\u00e7alardan olu\u015fturman\u0131za olanak tan\u0131r.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    make_timestamp(extract(year FROM now()), extract(month FROM now()), extract(day FROM now()), 23, 59, 59) AS end_of_day;<\/code><\/pre>\n<p>Bu kod, \u015fu anki y\u0131l, ay ve g\u00fcne g\u00f6re saat 23:59:59&#8217;u temsil eden bir <code class=\"language-\">timestamp<\/code> de\u011feri olu\u015fturur.  Bu y\u00f6ntem, <code class=\"language-\">date_trunc<\/code> y\u00f6ntemine g\u00f6re daha az okunabilir olabilir ancak baz\u0131 durumlarda daha fazla esneklik sa\u011flar.<\/p>\n<p><strong>G\u00fcn\u00fcn Sonunu Bulmak \u0130\u00e7in \u00d6zelle\u015ftirilmi\u015f Fonksiyonlar Olu\u015fturma<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolar i\u00e7in, kendi \u00f6zelle\u015ftirilmi\u015f fonksiyonlar\u0131n\u0131z\u0131 olu\u015fturabilirsiniz. Bu, kodunuzu daha okunabilir ve s\u00fcrd\u00fcr\u00fclebilir hale getirebilir.<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION end_of_day(timestamptz)\nRETURNS timestamptz AS $$\n  SELECT date_trunc('day', $1) + interval '1 day' - interval '1 second';\n$$ LANGUAGE sql STABLE;\n\nSELECT end_of_day(now());<\/code><\/pre>\n<p>Bu fonksiyon, verilen <code class=\"language-\">timestamptz<\/code> de\u011ferinin g\u00fcn\u00fcn\u00fcn son an\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.  <code class=\"language-\">STABLE<\/code> anahtar kelimesi, fonksiyonun ayn\u0131 girdi i\u00e7in her zaman ayn\u0131 \u00e7\u0131kt\u0131y\u0131 d\u00f6nd\u00fcrece\u011fini belirtir.  Bu, performans optimizasyonu i\u00e7in \u00f6nemlidir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131 ve Vaka Analizleri<\/strong><\/p>\n<p><strong>Vaka 1: G\u00fcnl\u00fck Raporlama:<\/strong> Bir online oyun \u015firketinin g\u00fcnl\u00fck oyuncu aktivitelerini takip etmesi gerekiyor.  <code class=\"language-\">end_of_day<\/code> fonksiyonunu kullanarak, her g\u00fcn\u00fcn sonuna kadar olan oyuncu giri\u015flerini, oyun s\u00fcrelerini ve di\u011fer metrikleri toplayabilirler.<\/p>\n<p><strong>Vaka 2: Zaman Serisi Analizi:<\/strong> Bir finans kurulu\u015fu, hisse senedi fiyatlar\u0131ndaki g\u00fcnl\u00fck de\u011fi\u015fimleri analiz etmek i\u00e7in g\u00fcn\u00fcn sonundaki kapan\u0131\u015f fiyatlar\u0131n\u0131 kullanabilir.  <code class=\"language-\">timestamp with time zone<\/code> kullanarak, farkl\u0131 zaman dilimlerinden gelen verileri do\u011fru bir \u015fekilde i\u015fleyebilirler.<\/p>\n<p><strong>Vaka 3: Otomasyon:<\/strong>  Bir sistem y\u00f6neticisi, g\u00fcnl\u00fck yedekleme i\u015flemlerini g\u00fcn\u00fcn sonunda otomatikle\u015ftirmek i\u00e7in <code class=\"language-\">end_of_day<\/code> fonksiyonunu kullanabilir.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong> Tarih ve zaman s\u00fctunlar\u0131na indeks olu\u015fturmak, sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>Fonksiyonlar:<\/strong> \u00d6zelle\u015ftirilmi\u015f fonksiyonlar kullanarak kod okunabilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini art\u0131rabilir ve performans\u0131 iyile\u015ftirebilirsiniz.<br \/>\n* <strong>SQL Optimizasyonu:<\/strong>  Sorgu optimizasyon teknikleri, \u00f6rne\u011fin <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131n\u0131 optimize ederek performans\u0131 art\u0131rabilir.<br \/>\n* <strong>Veri Tipleri:<\/strong> Uygun veri tiplerini se\u00e7mek, performans ve do\u011fruluk a\u00e7\u0131s\u0131ndan \u00f6nemlidir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de g\u00fcn\u00fcn sonunu bulman\u0131n farkl\u0131 y\u00f6ntemleri vard\u0131r.  <code class=\"language-\">date_trunc<\/code> fonksiyonu basit ve etkili bir y\u00f6ntem sunarken, <code class=\"language-\">make_timestamp<\/code> ve \u00f6zelle\u015ftirilmi\u015f fonksiyonlar daha fazla kontrol ve esneklik sa\u011flar.  Performans optimizasyonu i\u00e7in indeksleme ve SQL optimizasyonu tekniklerini kullanmak \u00f6nemlidir.  Do\u011fru zaman dilimi ayarlar\u0131n\u0131 yaparak ve olas\u0131 edge case&#8217;leri g\u00f6z \u00f6n\u00fcnde bulundurarak do\u011fru sonu\u00e7lar elde edebilirsiniz.  Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n bloguna](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">timestamp without time zone<\/code> ve <code class=\"language-\">timestamp with time zone<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">with time zone<\/code> zaman dilimlerini dikkate al\u0131rken, <code class=\"language-\">without time zone<\/code> yerel zaman\u0131 kullan\u0131r.<\/p>\n<p>2. <strong>\u00c7ok b\u00fcy\u00fck tablolar \u00fczerinde \u00e7al\u0131\u015f\u0131rken performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong>  \u0130ndeksleme, SQL optimizasyonu ve \u00f6zelle\u015ftirilmi\u015f fonksiyonlar kullanarak performans\u0131 art\u0131rabilirsiniz.<\/p>\n<p>3. <strong>G\u00fcn sonu hesaplamas\u0131nda zaman dilimi hatalar\u0131n\u0131 nas\u0131l \u00f6nleyebilirim?<\/strong>  <code class=\"language-\">timestamp with time zone<\/code> kullanarak ve zaman dilimi ayarlar\u0131n\u0131 do\u011fru yaparak hatalar\u0131 \u00f6nleyebilirsiniz.<\/p>\n<p>4. <strong>Kendi fonksiyonumu olu\u015fturman\u0131n avantajlar\u0131 nelerdir?<\/strong>  Kod okunabilirli\u011fi, s\u00fcrd\u00fcr\u00fclebilirlik ve performans optimizasyonu sa\u011flar.<\/p>\n<p>5. <strong><code class=\"language-\">date_trunc<\/code> fonksiyonunun s\u0131n\u0131rlamalar\u0131 nelerdir?<\/strong>  \u00c7ok karma\u015f\u0131k senaryolarda yeterli esnekli\u011fi sa\u011flamayabilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de G\u00fcn\u00fcn Sonunu Nas\u0131l Buluruz? PostgreSQL veritaban\u0131n\u0131zda g\u00fcn\u00fcn son an\u0131n\u0131 do\u011fru bir \u015fekilde belirlemek, zaman serisi verileri&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-25384","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: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r<\/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-gunun-sonunu-nasil-alinir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-05T12:17:33+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-gunun-sonunu-nasil-alinir\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r\",\"datePublished\":\"2025-07-05T12:17:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\"},\"wordCount\":1032,\"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-gunun-sonunu-nasil-alinir\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\",\"name\":\"PostgreSQL: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-05T12:17:33+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-sonunu-nasil-alinir\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: G\u00fcn\u00fcn Sonunu Nas\u0131l Al\u0131n\u0131r\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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