{"id":26618,"date":"2025-07-28T03:15:19","date_gmt":"2025-07-28T00:15:19","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/"},"modified":"2025-07-28T03:15:19","modified_gmt":"2025-07-28T00:15:19","slug":"postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/","title":{"rendered":"PostgreSQL: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?"},"content":{"rendered":"<p># PostgreSQL Tarih Format\u0131n\u0131 YYYY-MM Olarak Nas\u0131l D\u00fczenleriz?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda saklad\u0131\u011f\u0131n\u0131z tarih verilerini raporlama, analiz veya web uygulaman\u0131zda g\u00f6sterim amac\u0131yla YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcrmeniz mi gerekiyor?  Bu makalede, PostgreSQL&#8217;de tarih formatlamas\u0131n\u0131 ad\u0131m ad\u0131m \u00f6\u011frenecek, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle kar\u015f\u0131la\u015faca\u011f\u0131z ve performans optimizasyonuna de\u011finece\u011fiz.  Veritaban\u0131n\u0131zdaki tarih verilerini istedi\u011finiz formatta g\u00f6r\u00fcnt\u00fclemeyi \u00f6\u011frenmek i\u00e7in do\u011fru yerdesiniz!<\/p>\n<p><strong>PostgreSQL Tarih Fonksiyonlar\u0131na Giri\u015f<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verilerini i\u015flemek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Bu fonksiyonlar, tarih format\u0131n\u0131 de\u011fi\u015ftirmek, tarih aritmeti\u011fi yapmak ve tarih aral\u0131klar\u0131n\u0131 sorgulamak gibi bir\u00e7ok i\u015flemi kolayla\u015ft\u0131r\u0131r.  Bu makalede \u00f6zellikle <code class=\"language-\">to_char<\/code> fonksiyonuna odaklanaca\u011f\u0131z.  <code class=\"language-\">to_char<\/code> fonksiyonu, tarih ve zaman de\u011ferlerini \u00e7e\u015fitli formatlara d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n<p><strong>YYYY-MM Format\u0131na D\u00f6n\u00fc\u015ft\u00fcrme: Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>PostgreSQL&#8217;de tarih de\u011ferini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in <code class=\"language-\">to_char<\/code> fonksiyonunu kullan\u0131r\u0131z.  Bu fonksiyonun ilk arg\u00fcman\u0131 tarih de\u011feri, ikinci arg\u00fcman\u0131 ise format \u015fablonudur.  YYYY-MM format\u0131n\u0131 elde etmek i\u00e7in <code class=\"language-\">'YYYY-MM'<\/code> format \u015fablonunu kullan\u0131r\u0131z.<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki \u00f6rnek, <code class=\"language-\">tarih<\/code> adl\u0131 bir tarih s\u00fctununu i\u00e7eren <code class=\"language-\">urunler<\/code> adl\u0131 bir tabloda bulunan tarih verilerini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(tarih, 'YYYY-MM') AS tarih_formatli\nFROM urunler;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">tarih<\/code> s\u00fctunundaki her bir tarih de\u011ferini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr ve <code class=\"language-\">tarih_formatli<\/code> adl\u0131 yeni bir s\u00fctunda sonu\u00e7lar\u0131 g\u00f6sterir.  \u00d6rne\u011fin, <code class=\"language-\">2024-03-15<\/code> tarihi <code class=\"language-\">2024-03<\/code> olarak d\u00f6n\u00fc\u015ft\u00fcr\u00fclecektir.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek bir senaryo ele alal\u0131m. Bir e-ticaret sitesinin \u00fcr\u00fcn sat\u0131\u015flar\u0131n\u0131 ay baz\u0131nda analiz etmek istedi\u011fimizi d\u00fc\u015f\u00fcnelim.  <code class=\"language-\">satislar<\/code> adl\u0131 bir tablomuz olsun ve bu tabloda <code class=\"language-\">satis_tarihi<\/code> ve <code class=\"language-\">satis_miktari<\/code> s\u00fctunlar\u0131 bulunsun.  Ayl\u0131k sat\u0131\u015flar\u0131 toplamak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(satis_tarihi, 'YYYY-MM') AS ay, SUM(satis_miktari) AS toplam_satis\nFROM satislar\nGROUP BY ay\nORDER BY ay;<\/code><\/pre>\n<p>Bu sorgu, sat\u0131\u015f tarihlerini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr, aylara g\u00f6re gruplar ve her ay i\u00e7in toplam sat\u0131\u015f miktar\u0131n\u0131 hesaplar.  Sonu\u00e7lar, en eski aydan en yeni aya do\u011fru s\u0131ralan\u0131r.  Bu sorguyu optimize etmek i\u00e7in uygun indeksler olu\u015fturman\u0131z \u00f6nemlidir.  <code class=\"language-\">satis_tarihi<\/code> s\u00fctununa bir indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<\/p>\n<p><strong>\u0130leri Seviye: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">to_char<\/code> fonksiyonunun performans\u0131n\u0131 etkileyebilecek fakt\u00f6rler vard\u0131r.  \u00d6rne\u011fin, indeks eksikli\u011fi veya yanl\u0131\u015f indeks kullan\u0131m\u0131 performans\u0131 olumsuz etkileyebilir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu plan\u0131n\u0131 inceleyerek performans darbo\u011fazlar\u0131n\u0131 tespit edebilir ve optimize edebilirsiniz.  Ayr\u0131ca, <code class=\"language-\">to_char<\/code> fonksiyonunun null de\u011ferlerle nas\u0131l ba\u015fa \u00e7\u0131kt\u0131\u011f\u0131n\u0131 bilmek \u00f6nemlidir.  <code class=\"language-\">NULL<\/code> bir tarih de\u011feri <code class=\"language-\">to_char<\/code> fonksiyonuna girerse, sonu\u00e7 da <code class=\"language-\">NULL<\/code> olacakt\u0131r.  Bu durumlar\u0131 ele almak i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT COALESCE(to_char(satis_tarihi, 'YYYY-MM'), 'Bilinmiyor') AS ay, SUM(satis_miktari) AS toplam_satis\nFROM satislar\nGROUP BY ay\nORDER BY ay;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satis_tarihi<\/code> s\u00fctununda <code class=\"language-\">NULL<\/code> de\u011fer varsa, <code class=\"language-\">ay<\/code> s\u00fctununda &#8216;Bilinmiyor&#8217; de\u011ferini g\u00f6sterir.<\/p>\n<p><strong>PostgreSQL Tarih Formatlama:  Daha Fazla \u00d6rnek<\/strong><\/p>\n<p><code class=\"language-\">to_char<\/code> fonksiyonu, \u00e7e\u015fitli tarih formatlar\u0131n\u0131 destekler.  \u00d6rne\u011fin, ay ad\u0131n\u0131 da i\u00e7eren bir format olu\u015fturmak i\u00e7in a\u015fa\u011f\u0131daki gibi bir \u015fablon kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(tarih, 'YYYY-Month') AS tarih_formatli\nFROM urunler;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">tarih<\/code> s\u00fctunundaki de\u011ferleri &#8220;YYYY-Ocak&#8221;, &#8220;YYYY-\u015eubat&#8221; gibi formatta g\u00f6sterir.  Daha fazla formatlama se\u00e7ene\u011fi i\u00e7in PostgreSQL dok\u00fcmanlar\u0131na bakabilirsiniz.  [Fatih Soysal&#8217;\u0131n PostgreSQL \u00fczerine yazd\u0131\u011f\u0131 blog yaz\u0131lar\u0131nda](https:\/\/fatihsoysal.com) daha detayl\u0131 bilgi bulabilirsiniz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka Analizleri<\/strong><\/p>\n<p><strong>Vaka 1:  Web Uygulamas\u0131 Tarih G\u00f6sterimi:<\/strong> Bir web uygulamas\u0131nda, kullan\u0131c\u0131ya \u00fcr\u00fcnlerin sat\u0131\u015f tarihlerini YYYY-MM format\u0131nda g\u00f6stermek istiyoruz.  Yukar\u0131daki <code class=\"language-\">to_char<\/code> fonksiyonunu kullanarak veritaban\u0131ndan \u00e7ekti\u011fimiz tarih verilerini istedi\u011fimiz formatta kullan\u0131c\u0131ya sunabiliriz.<\/p>\n<p><strong>Vaka 2:  Raporlama ve Analiz:<\/strong>  Bir \u015firketin ayl\u0131k gelir raporunu olu\u015fturmak i\u00e7in, sat\u0131\u015f verilerini aylara g\u00f6re gruplay\u0131p toplam geliri hesaplamam\u0131z gerekir.  <code class=\"language-\">to_char<\/code> fonksiyonu ile sat\u0131\u015f tarihlerini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcrerek bu i\u015flemi kolayca yapabiliriz.<\/p>\n<p><strong>Vaka 3: Ar\u015fivleme:<\/strong> Eski verileri ar\u015fivlerken, tarih s\u00fctunlar\u0131n\u0131 daha kompakt bir formatta saklayarak depolama alan\u0131ndan tasarruf edebiliriz. YYYY-MM format\u0131, bu ama\u00e7 i\u00e7in uygun bir se\u00e7enek olabilir.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  Tarih s\u00fctunlar\u0131na uygun indeksler olu\u015fturarak sorgu performans\u0131n\u0131 art\u0131rabilirsiniz.<br \/>\n* <strong>Fonksiyonel \u0130ndeksler:<\/strong>  <code class=\"language-\">to_char(tarih, 'YYYY-MM')<\/code> ifadesi \u00fczerinde fonksiyonel bir indeks olu\u015fturmak, bu ifadeyi i\u00e7eren sorgular\u0131n performans\u0131n\u0131 iyile\u015ftirebilir.<br \/>\n* <strong>Sorgu Optimizasyonu:<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu plan\u0131n\u0131 analiz ederek performans darbo\u011fazlar\u0131n\u0131 tespit edebilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de tarih verilerini YYYY-MM format\u0131na d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in <code class=\"language-\">to_char<\/code> fonksiyonunu kullanabilirsiniz.  Bu makalede, farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in ad\u0131m ad\u0131m bir rehber sunarak, ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyonu ipu\u00e7lar\u0131 payla\u015ft\u0131k.  Do\u011fru indeksleme ve sorgu optimizasyonu ile b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde bile y\u00fcksek performans elde edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">to_char<\/code> fonksiyonu hangi tarih formatlar\u0131n\u0131 destekler?<\/strong>  PostgreSQL dok\u00fcmanlar\u0131nda detayl\u0131 format \u015fablonlar\u0131 bulunmaktad\u0131r.<br \/>\n2. <strong><code class=\"language-\">NULL<\/code> de\u011ferler nas\u0131l i\u015flenir?<\/strong>  <code class=\"language-\">NULL<\/code> de\u011ferler i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonu kullan\u0131labilir.<br \/>\n3. <strong>Performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  Uygun indeksler olu\u015fturarak ve sorguyu optimize ederek performans\u0131 art\u0131rabilirsiniz.<br \/>\n4. <strong>Ay ad\u0131n\u0131 i\u00e7eren bir format nas\u0131l olu\u015fturulur?<\/strong>  <code class=\"language-\">'YYYY-Month'<\/code> format \u015fablonu kullan\u0131labilir.<br \/>\n5. <strong>Farkl\u0131 dil ayarlar\u0131nda nas\u0131l sonu\u00e7 alabilirim?<\/strong>  PostgreSQL&#8217;in dil ayarlar\u0131n\u0131 de\u011fi\u015ftirerek farkl\u0131 dillerde ay adlar\u0131n\u0131 elde edebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL Tarih Format\u0131n\u0131 YYYY-MM Olarak Nas\u0131l D\u00fczenleriz? PostgreSQL veritaban\u0131n\u0131zda saklad\u0131\u011f\u0131n\u0131z tarih verilerini raporlama, analiz veya web uygulaman\u0131zda&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-26618","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: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?<\/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-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-28T00:15:19+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-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?\",\"datePublished\":\"2025-07-28T00:15:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\"},\"wordCount\":896,\"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-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\",\"name\":\"PostgreSQL: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-28T00:15:19+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-yyyy-mm-formatinda-nasil-bicimlendiririz\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Tarihi YYYY-MM Format\u0131nda Nas\u0131l Bi\u00e7imlendiririz?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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