{"id":25424,"date":"2025-07-06T06:15:22","date_gmt":"2025-07-06T03:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/"},"modified":"2025-07-06T06:15:22","modified_gmt":"2025-07-06T03:15:22","slug":"postgresql-ay-adina-gore-siralama","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/","title":{"rendered":"PostgreSQL: Ay Ad\u0131na G\u00f6re S\u0131ralama"},"content":{"rendered":"<p># PostgreSQL&#8217;de Ay Ad\u0131na G\u00f6re S\u0131ralama Nas\u0131l Yap\u0131l\u0131r?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda tarih verileriniz var ve bu verileri ay isimlerine g\u00f6re s\u0131ralamak m\u0131 istiyorsunuz?  \u00d6rne\u011fin, her ay\u0131n sat\u0131\u015flar\u0131n\u0131 ay isimlerine g\u00f6re s\u0131ralayarak g\u00f6rselle\u015ftirmek veya raporlamak m\u0131 gerekiyor? Bu makalede, PostgreSQL&#8217;de ay ad\u0131na g\u00f6re s\u0131ralama i\u015flemini ad\u0131m ad\u0131m, ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar detayl\u0131 olarak ele alaca\u011f\u0131z.  Ger\u00e7ek d\u00fcnya senaryolar\u0131, performans optimizasyonu ipu\u00e7lar\u0131 ve olas\u0131 sorunlar ile \u00e7\u00f6z\u00fcmleri bulacaks\u0131n\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de ay ad\u0131na g\u00f6re s\u0131ralamay\u0131 \u00f6\u011frenmek i\u00e7in \u00fc\u00e7 seviyeye ayr\u0131lm\u0131\u015f bir yol haritas\u0131 sunmaktad\u0131r:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> Ad\u0131m ad\u0131m a\u00e7\u0131klama ve basit kod \u00f6rne\u011fi.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat \u00f6rne\u011fi ve optimizasyon ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi ve edge case&#8217;ler (ola\u011fan d\u0131\u015f\u0131 durumlar).<\/p>\n<p><strong>PostgreSQL ve Tarih Verileri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verilerini depolamak ve i\u015flemek i\u00e7in \u00e7e\u015fitli veri tipleri sunar. Bunlardan en yayg\u0131n kullan\u0131lan\u0131 <code class=\"language-\">date<\/code> ve <code class=\"language-\">timestamp<\/code> tipleridir.  Bu tipler, tarih ve zaman bilgilerini tutar, ancak ay ad\u0131na g\u00f6re do\u011frudan s\u0131ralama yapman\u0131za izin vermezler.  Ay ad\u0131na g\u00f6re s\u0131ralama i\u00e7in, tarih verilerinden ay ad\u0131n\u0131 \u00e7\u0131kart\u0131p, bunu s\u0131ralama kriteri olarak kullanmam\u0131z gerekir.<\/p>\n<p><strong>Ay Ad\u0131n\u0131 \u00c7\u0131karmak:  <code class=\"language-\">EXTRACT<\/code> Fonksiyonu<\/strong><\/p>\n<p>PostgreSQL&#8217;in <code class=\"language-\">EXTRACT<\/code> fonksiyonu, tarih ve zaman verilerinden \u00e7e\u015fitli bile\u015fenleri (y\u0131l, ay, g\u00fcn, saat vb.) ay\u0131klamay\u0131 sa\u011flar. Bizim ihtiyac\u0131m\u0131z olan, tarih verisinden ay numaras\u0131n\u0131 \u00e7\u0131karmak ve bunu ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcrmektir.  A\u015fa\u011f\u0131daki \u00f6rnekte, <code class=\"language-\">tarih<\/code> s\u00fctunundan ay numaras\u0131n\u0131 alan ve bunu bir <code class=\"language-\">CASE<\/code> ifadesi kullanarak ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcren bir sorgu g\u00f6sterilmektedir:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    EXTRACT(MONTH FROM tarih) AS ay_numarasi,\n    CASE\n        WHEN EXTRACT(MONTH FROM tarih) = 1 THEN 'Ocak'\n        WHEN EXTRACT(MONTH FROM tarih) = 2 THEN '\u015eubat'\n        WHEN EXTRACT(MONTH FROM tarih) = 3 THEN 'Mart'\n        -- ... di\u011fer aylar ...\n        WHEN EXTRACT(MONTH FROM tarih) = 12 THEN 'Aral\u0131k'\n        ELSE 'Ge\u00e7ersiz Ay'\n    END AS ay_adi\nFROM\n    satislar;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satislar<\/code> tablosundaki her sat\u0131r i\u00e7in ay numaras\u0131n\u0131 ve kar\u015f\u0131l\u0131k gelen ay ad\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.  &#8220;Ge\u00e7ersiz Ay&#8221; ifadesi, olas\u0131 hatalar\u0131 yakalamak i\u00e7in eklenmi\u015ftir.<\/p>\n<p><strong>PostgreSQL&#8217;de Ay Ad\u0131na G\u00f6re S\u0131ralama: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p>\u015eimdi, ay ad\u0131na g\u00f6re s\u0131ralama i\u015flemini ger\u00e7ekle\u015ftirelim.  \u00d6nceki sorguyu geli\u015ftirerek, ay ad\u0131na g\u00f6re s\u0131ralanm\u0131\u015f sonu\u00e7lar\u0131 elde edebiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    EXTRACT(MONTH FROM tarih) AS ay_numarasi,\n    CASE\n        WHEN EXTRACT(MONTH FROM tarih) = 1 THEN 'Ocak'\n        WHEN EXTRACT(MONTH FROM tarih) = 2 THEN '\u015eubat'\n        -- ... di\u011fer aylar ...\n        WHEN EXTRACT(MONTH FROM tarih) = 12 THEN 'Aral\u0131k'\n        ELSE 'Ge\u00e7ersiz Ay'\n    END AS ay_adi,\n    SUM(tutar) AS toplam_tutar\nFROM\n    satislar\nGROUP BY\n    ay_numarasi, ay_adi\nORDER BY\n    ay_numarasi;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satislar<\/code> tablosundaki sat\u0131\u015flar\u0131 ay ad\u0131na ve toplam tutara g\u00f6re grupland\u0131r\u0131r ve ay numaras\u0131na g\u00f6re s\u0131ralar.  Ay numaras\u0131na g\u00f6re s\u0131ralama, aylar\u0131n kronolojik s\u0131rada g\u00f6r\u00fcnmesini sa\u011flar.  Daha okunakl\u0131 bir \u00e7\u0131kt\u0131 i\u00e7in <code class=\"language-\">ORDER BY ay_adi<\/code> kullanabilirsiniz, ancak bu durumda &#8220;Ocak&#8221;, &#8220;\u015eubat&#8221;, &#8220;Mart&#8221; s\u0131ralamas\u0131n\u0131 garanti etmez.<\/p>\n<p><strong>Yeni Ba\u015flayan Seviyesi Tamamland\u0131.<\/strong><\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi: E-Ticaret Veri Analizi<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinde \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z\u0131 ve her ay\u0131n sat\u0131\u015flar\u0131n\u0131 analiz etmek istedi\u011finizi varsayal\u0131m.  <code class=\"language-\">satislar<\/code> tablosunda <code class=\"language-\">tarih<\/code> (date) ve <code class=\"language-\">tutar<\/code> (numeric) s\u00fctunlar\u0131 bulunmaktad\u0131r.  A\u015fa\u011f\u0131daki sorgu, her ay\u0131n toplam sat\u0131\u015f tutar\u0131n\u0131 ay ad\u0131na g\u00f6re s\u0131ralayarak g\u00f6sterir:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    to_char(tarih, 'Month') AS ay_adi,\n    SUM(tutar) AS toplam_sat\u0131\u015f\nFROM\n    satislar\nGROUP BY\n    ay_adi\nORDER BY\n    to_char(tarih, 'MM'); -- Ay numaras\u0131na g\u00f6re s\u0131ralama<\/code><\/pre>\n<p><code class=\"language-\">to_char<\/code> fonksiyonu tarih format\u0131n\u0131 ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  <code class=\"language-\">ORDER BY to_char(tarih, 'MM')<\/code> ise ay numaras\u0131na g\u00f6re s\u0131ralama yapar, b\u00f6ylece Ocak, \u015eubat, Mart \u015feklinde do\u011fru bir s\u0131ralama elde edilir.<\/p>\n<p><strong>Orta Seviye Tamamland\u0131.<\/strong><\/p>\n<p><strong>Performans Optimizasyonu: \u0130ndeksler ve Fonksiyonel \u0130ndeksler<\/strong><\/p>\n<p>B\u00fcy\u00fck veri setlerinde, yukar\u0131daki sorgular\u0131n performans\u0131 d\u00fc\u015febilir.  Performans\u0131 art\u0131rmak i\u00e7in, <code class=\"language-\">tarih<\/code> s\u00fctununa bir indeks ekleyebilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_satislar_tarih ON satislar (tarih);<\/code><\/pre>\n<p>Daha da ileri giderek, fonksiyonel indeksler kullanabilirsiniz. Fonksiyonel indeksler, bir s\u00fctunun \u00fczerinde bir fonksiyonun sonucuna indeks olu\u015fturman\u0131z\u0131 sa\u011flar. Bu durumda, <code class=\"language-\">to_char(tarih, 'Month')<\/code> fonksiyonunun sonucuna indeks olu\u015fturmak, sorgunun performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_satislar_ay_adi ON satislar (to_char(tarih, 'Month'));<\/code><\/pre>\n<p>Ancak, fonksiyonel indeksler her zaman en iyi \u00e7\u00f6z\u00fcm olmayabilir. \u0130ndeks kullan\u0131m\u0131n\u0131 analiz ederek, en uygun indeks stratejisini belirlemek \u00f6nemlidir.  <code class=\"language-\">EXPLAIN<\/code> komutu ile sorgular\u0131n\u0131z\u0131n y\u00fcr\u00fctme plan\u0131n\u0131 inceleyebilirsiniz.<\/p>\n<p><strong>\u0130leri Seviye (Performans Analizi) Ba\u015flad\u0131.<\/strong><\/p>\n<p><strong>Edge Case&#8217;ler ve Hata Y\u00f6netimi<\/strong><\/p>\n<p><code class=\"language-\">EXTRACT<\/code> ve <code class=\"language-\">to_char<\/code> fonksiyonlar\u0131 ile \u00e7al\u0131\u015f\u0131rken, baz\u0131 edge case&#8217;lerle kar\u015f\u0131la\u015fabilirsiniz. \u00d6rne\u011fin, veri setinizde ge\u00e7ersiz tarih de\u011ferleri varsa, sorgular\u0131n\u0131z hata verebilir veya beklenmedik sonu\u00e7lar \u00fcretebilir.  Bu durumlar\u0131 \u00f6nlemek i\u00e7in, verilerinizi temizlemeniz ve ge\u00e7ersiz de\u011ferleri ele alman\u0131z gerekebilir.  <code class=\"language-\">COALESCE<\/code> fonksiyonu, NULL de\u011ferleri i\u015flemek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de ay ad\u0131na g\u00f6re s\u0131ralama i\u015flemini ad\u0131m ad\u0131m anlatt\u0131k.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar \u00e7e\u015fitli teknikleri ve performans optimizasyonu ipu\u00e7lar\u0131n\u0131 payla\u015ft\u0131k.  Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve edge case&#8217;ler ile kar\u015f\u0131la\u015fabilece\u011finiz sorunlar\u0131 ve \u00e7\u00f6z\u00fcm yollar\u0131n\u0131 ele ald\u0131k.  Do\u011fru indeksleme stratejileri kullanarak, b\u00fcy\u00fck veri setlerinde bile y\u00fcksek performansl\u0131 sorgular yazabilirsiniz.  <code class=\"language-\">fatihsoysal.com<\/code> adresinden daha fazla PostgreSQL e\u011fitimine ula\u015fabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Ay isimlerini farkl\u0131 bir dile nas\u0131l \u00e7evirebilirim?<\/strong>  <code class=\"language-\">CASE<\/code> ifadesinde ay isimlerini ilgili dildeki kar\u015f\u0131l\u0131klar\u0131yla de\u011fi\u015ftirebilirsiniz.<\/p>\n<p>2. <strong>Y\u0131l ve ay baz\u0131nda s\u0131ralama nas\u0131l yap\u0131l\u0131r?<\/strong>  <code class=\"language-\">ORDER BY<\/code> c\u00fcmlesinde y\u0131l ve ay s\u00fctunlar\u0131n\u0131 virg\u00fclle ay\u0131rarak s\u0131ralayabilirsiniz. \u00d6rne\u011fin: <code class=\"language-\">ORDER BY EXTRACT(YEAR FROM tarih), EXTRACT(MONTH FROM tarih);<\/code><\/p>\n<p>3. <strong>\u00c7ok b\u00fcy\u00fck veri setlerinde performans\u0131 nas\u0131l daha da iyile\u015ftirebilirim?<\/strong>  Par\u00e7al\u0131 sorgular (partitioning) veya materyalize g\u00f6r\u00fcn\u00fcmler (materialized views) kullanabilirsiniz.<\/p>\n<p>4. <strong>Ge\u00e7ersiz tarih verilerini nas\u0131l ele alabilirim?<\/strong>  <code class=\"language-\">COALESCE<\/code> fonksiyonu veya <code class=\"language-\">CASE<\/code> ifadesi ile ge\u00e7ersiz verileri filtreleyebilir veya bunlara varsay\u0131lan bir de\u011fer atayabilirsiniz.<\/p>\n<p>5. <strong><code class=\"language-\">to_char<\/code> fonksiyonunun farkl\u0131 format se\u00e7enekleri nelerdir?<\/strong> PostgreSQL dok\u00fcmanlar\u0131na bakarak <code class=\"language-\">to_char<\/code> fonksiyonunun t\u00fcm format se\u00e7eneklerini inceleyebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Ay Ad\u0131na G\u00f6re S\u0131ralama Nas\u0131l Yap\u0131l\u0131r? PostgreSQL veritaban\u0131n\u0131zda tarih verileriniz var ve bu verileri ay isimlerine&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-25424","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 Ad\u0131na G\u00f6re S\u0131ralama<\/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-ay-adina-gore-siralama\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Ay Ad\u0131na G\u00f6re S\u0131ralama\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-06T03:15:22+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-ay-adina-gore-siralama\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Ay Ad\u0131na G\u00f6re S\u0131ralama\",\"datePublished\":\"2025-07-06T03:15:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\"},\"wordCount\":919,\"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-ay-adina-gore-siralama\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\",\"name\":\"PostgreSQL: Ay Ad\u0131na G\u00f6re S\u0131ralama\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-06T03:15:22+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-ay-adina-gore-siralama\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Ay Ad\u0131na G\u00f6re S\u0131ralama\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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