{"id":27724,"date":"2025-08-18T03:15:20","date_gmt":"2025-08-18T00:15:20","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/"},"modified":"2025-08-18T03:15:20","modified_gmt":"2025-08-18T00:15:20","slug":"postgresql-ayin-son-gununu-nasil-bulurum","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/","title":{"rendered":"PostgreSQL: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?"},"content":{"rendered":"<p># PostgreSQL&#8217;de Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Buluruz?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, belirli bir tarihin ait oldu\u011fu ay\u0131n son g\u00fcn\u00fcn\u00fc belirlemek s\u0131kl\u0131kla ihtiya\u00e7 duyulan bir i\u015flemdir.  \u00d6rne\u011fin, ayl\u0131k raporlama, faturalama sistemleri veya d\u00f6nemsel analizler gibi bir\u00e7ok senaryoda bu bilgiye ihtiya\u00e7 duyabilirsiniz. Bu makalede, PostgreSQL&#8217;de ay\u0131n son g\u00fcn\u00fcn\u00fc bulman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonunu ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc tarih 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><strong>Yeni Ba\u015flayan:<\/strong>  Temel fonksiyonlar ve basit \u00f6rneklerle ay\u0131n son g\u00fcn\u00fcn\u00fc bulmay\u0131 \u00f6\u011frenece\u011fiz.<\/p>\n<p><strong>Orta Seviye:<\/strong>  Ger\u00e7ek d\u00fcnya senaryolar\u0131na dayal\u0131 \u00f6rnekler ve performans optimizasyon ipu\u00e7lar\u0131 ile daha ileri teknikleri ke\u015ffedece\u011fiz.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizleri, edge case&#8217;ler ve karma\u015f\u0131k senaryolarda en uygun \u00e7\u00f6z\u00fcmleri ele alaca\u011f\u0131z.<\/p>\n<p><strong>Temel Kavramlar: Tarih ve Zaman Fonksiyonlar\u0131<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verilerini i\u015flemek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar. Bu fonksiyonlar, ay\u0131n son g\u00fcn\u00fcn\u00fc bulmak i\u00e7in temel yap\u0131 ta\u015flar\u0131n\u0131 olu\u015fturur.  \u00d6ncelikle, en \u00f6nemli fonksiyonlar\u0131 tan\u0131yal\u0131m:<\/p>\n<p>* <strong><code class=\"language-\">EXTRACT(field FROM timestamp)<\/code>:<\/strong>  Bir zaman damgas\u0131ndan belirli bir alan\u0131 (y\u0131l, ay, g\u00fcn, vb.) ay\u0131klar.<br \/>\n* <strong><code class=\"language-\">DATE_TRUNC('month', timestamp)<\/code>:<\/strong>  Bir zaman damgas\u0131n\u0131 ay\u0131n ba\u015f\u0131na yuvarlar.<br \/>\n* <strong><code class=\"language-\">MAKE_DATE(year, month, day)<\/code>:<\/strong>  Belirtilen y\u0131l, ay ve g\u00fcnden bir tarih olu\u015fturur.<br \/>\n* <strong><code class=\"language-\">LAST_DAY()<\/code> (PostgreSQL 14 ve \u00fczeri):<\/strong>  Belirtilen tarihin ait oldu\u011fu ay\u0131n son g\u00fcn\u00fcn\u00fc do\u011frudan verir.<\/p>\n<p><strong>PostgreSQL&#8217;de Ay\u0131n Son G\u00fcn\u00fcn\u00fc Bulma: Ad\u0131m Ad\u0131m Uygulama<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p>En basit y\u00f6ntem, <code class=\"language-\">MAKE_DATE()<\/code> ve <code class=\"language-\">EXTRACT()<\/code> fonksiyonlar\u0131n\u0131 birle\u015ftirmektir.  \u00d6rne\u011fin, 2024 Mart ay\u0131n\u0131n son g\u00fcn\u00fcn\u00fc bulmak i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT MAKE_DATE(2024, 3, 1) + INTERVAL '1 month' - INTERVAL '1 day';<\/code><\/pre>\n<p>Bu kod, \u00f6nce 2024 Mart ay\u0131n\u0131n ilk g\u00fcn\u00fcn\u00fc olu\u015fturur, ard\u0131ndan bir ay ekler ve son olarak bir g\u00fcn \u00e7\u0131kararak ay\u0131n son g\u00fcn\u00fcn\u00fc elde eder.<\/p>\n<p><strong>\u00d6rnek:<\/strong>  Bir tablonuzda tarih s\u00fctunu varsa, ay\u0131n son g\u00fcn\u00fcn\u00fc \u015fu \u015fekilde bulabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT tarih, \n       (DATE_TRUNC('month', tarih) + INTERVAL '1 month' - INTERVAL '1 day') as ayin_son_gunu\nFROM siparisler;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">siparisler<\/code> tablosundaki her tarih i\u00e7in ilgili ay\u0131n son g\u00fcn\u00fcn\u00fc hesaplar.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinde, ayl\u0131k sat\u0131\u015f raporlar\u0131 olu\u015fturman\u0131z gerekti\u011fini varsayal\u0131m. Her sipari\u015fin tarihini i\u00e7eren bir <code class=\"language-\">siparisler<\/code> tablonuz var.  Her ay\u0131n son g\u00fcn\u00fcn\u00fc bulup, o aya ait toplam sat\u0131\u015flar\u0131 hesaplamak istiyorsunuz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    TO_CHAR(DATE_TRUNC('month', siparis_tarihi), 'YYYY-MM') AS ay,\n    SUM(siparis_tutari) AS toplam_satis\nFROM\n    siparisler\nGROUP BY\n    ay\nORDER BY\n    ay;<\/code><\/pre>\n<p>Bu sorgu, sipari\u015f tarihlerini aya g\u00f6re gruplayarak her ay\u0131n toplam sat\u0131\u015flar\u0131n\u0131 g\u00f6sterir.  Ancak, ay\u0131n son g\u00fcn\u00fcn\u00fc do\u011frudan g\u00f6stermez.  Ay\u0131n son g\u00fcn\u00fcn\u00fc de eklemek i\u00e7in sorguyu \u015fu \u015fekilde d\u00fczenleyebiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    TO_CHAR(DATE_TRUNC('month', siparis_tarihi), 'YYYY-MM') AS ay,\n    (DATE_TRUNC('month', MAX(siparis_tarihi)) + INTERVAL '1 month' - INTERVAL '1 day') as ayin_son_gunu,\n    SUM(siparis_tutari) AS toplam_satis\nFROM\n    siparisler\nGROUP BY\n    ay\nORDER BY\n    ay;<\/code><\/pre>\n<p>Bu, her ay i\u00e7in ay\u0131n son g\u00fcn\u00fcn\u00fc de g\u00f6sterir.  Ancak, <code class=\"language-\">MAX(siparis_tarihi)<\/code> kullan\u0131m\u0131 performans sorunlar\u0131na yol a\u00e7abilir, \u00f6zellikle b\u00fcy\u00fck tablolarda.  Daha iyi performans i\u00e7in, ay\u0131n son g\u00fcn\u00fcn\u00fc \u00f6nceden hesaplay\u0131p bir alt sorgu veya CTE (Common Table Expression) kullanmak daha verimli olacakt\u0131r.<\/p>\n<p><strong>Performans Analizi ve Edge Case&#8217;ler (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, performans kritik \u00f6neme sahiptir.  Yukar\u0131daki \u00f6rneklerde kullan\u0131lan y\u00f6ntemler, k\u00fc\u00e7\u00fck tablolarda yeterli olabilir, ancak milyonlarca sat\u0131r\u0131 olan tablolarda performans d\u00fc\u015f\u00fc\u015f\u00fcne yol a\u00e7abilir.  Bu durumlarda,  <code class=\"language-\">generate_series<\/code> fonksiyonunu kullanarak \u00f6nceden hesaplanm\u0131\u015f bir ay sonu tarihleri tablosu olu\u015fturmak daha verimli olabilir:<\/p>\n<pre class=\"language-sql\"><code>WITH ay_sonlari AS (\n    SELECT generate_series(date '2023-01-01', date '2025-12-31', interval '1 month') - interval '1 day' as ayin_son_gunu\n)\nSELECT s.siparis_tarihi, a.ayin_son_gunu, s.siparis_tutari\nFROM siparisler s\nJOIN ay_sonlari a ON date_trunc('month', s.siparis_tarihi) = date_trunc('month', a.ayin_son_gunu);<\/code><\/pre>\n<p>Bu yakla\u015f\u0131m, ay\u0131n son g\u00fcnlerini \u00f6nceden hesaplayarak ve bir <code class=\"language-\">JOIN<\/code> i\u015flemiyle birle\u015ftirerek performans\u0131 iyile\u015ftirebilir.  Ancak,  <code class=\"language-\">generate_series<\/code> fonksiyonunun aral\u0131\u011f\u0131n\u0131 do\u011fru bir \u015fekilde belirlemek \u00f6nemlidir.<\/p>\n<p><strong>PostgreSQL 14 ve \u00dczeri: LAST_DAY() Fonksiyonu<\/strong><\/p>\n<p>PostgreSQL 14 ve sonraki s\u00fcr\u00fcmlerinde, <code class=\"language-\">LAST_DAY()<\/code> fonksiyonu do\u011frudan ay\u0131n son g\u00fcn\u00fcn\u00fc d\u00f6nd\u00fcr\u00fcr, bu da kodu basitle\u015ftirir ve performans\u0131 art\u0131r\u0131r.<\/p>\n<pre class=\"language-sql\"><code>SELECT LAST_DAY(siparis_tarihi) FROM siparisler;<\/code><\/pre>\n<p>Bu fonksiyon,  \u00f6nceki y\u00f6ntemlere g\u00f6re daha okunabilir ve daha verimlidir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de ay\u0131n son g\u00fcn\u00fcn\u00fc bulmak i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  Veri k\u00fcmesinin b\u00fcy\u00fckl\u00fc\u011f\u00fc ve PostgreSQL s\u00fcr\u00fcm\u00fc dikkate al\u0131narak en uygun y\u00f6ntemi se\u00e7mek \u00f6nemlidir.  PostgreSQL 14 ve \u00fczeri s\u00fcr\u00fcmler i\u00e7in <code class=\"language-\">LAST_DAY()<\/code> fonksiyonu en basit ve verimli \u00e7\u00f6z\u00fcm\u00fc sunar.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in ise, \u00f6nceden hesaplanm\u0131\u015f bir tarih tablosu veya uygun indeksleme teknikleri kullanmak performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Ay\u0131n son g\u00fcn\u00fc her zaman ayn\u0131 g\u00fcn m\u00fcd\u00fcr?<\/strong> Hay\u0131r, aylar\u0131n farkl\u0131 g\u00fcn say\u0131lar\u0131 vard\u0131r (28, 29, 30 veya 31 g\u00fcn).<br \/>\n2. <strong><code class=\"language-\">LAST_DAY()<\/code> fonksiyonu t\u00fcm PostgreSQL s\u00fcr\u00fcmlerinde mevcut mu?<\/strong> Hay\u0131r, sadece PostgreSQL 14 ve \u00fczeri s\u00fcr\u00fcmlerinde mevcuttur.<br \/>\n3. <strong>Performans\u0131 nas\u0131l daha da iyile\u015ftirebilirim?<\/strong> Uygun indeksler olu\u015fturmak ve gereksiz i\u015flemlerden ka\u00e7\u0131nmak performans\u0131 art\u0131rabilir.<br \/>\n4. <strong>Negatif tarih de\u011ferleri i\u00e7in nas\u0131l i\u015flem yapabilirim?<\/strong>  Negatif tarih de\u011ferleri i\u00e7in \u00f6zel durum kontrolleri eklemeniz gerekebilir.<br \/>\n5.  <strong>Farkl\u0131 zaman dilimlerini nas\u0131l ele alabilirim?<\/strong> Zaman dilimlerini a\u00e7\u0131k\u00e7a belirtmek ve <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanmak \u00f6nemlidir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Buluruz? PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, belirli bir tarihin ait oldu\u011fu ay\u0131n son g\u00fcn\u00fcn\u00fc&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-27724","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: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?<\/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-ayin-son-gununu-nasil-bulurum\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-18T00:15:20+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-ayin-son-gununu-nasil-bulurum\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?\",\"datePublished\":\"2025-08-18T00:15:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\"},\"wordCount\":847,\"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-ayin-son-gununu-nasil-bulurum\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\",\"name\":\"PostgreSQL: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-08-18T00:15:20+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ayin-son-gununu-nasil-bulurum\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Ay\u0131n Son G\u00fcn\u00fcn\u00fc Nas\u0131l Bulurum?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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