{"id":25717,"date":"2025-07-12T12:15:23","date_gmt":"2025-07-12T09:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/"},"modified":"2025-07-12T12:15:23","modified_gmt":"2025-07-12T09:15:23","slug":"postgresql-sayidan-ay-adi-nasil-alinir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/","title":{"rendered":"PostgreSQL: Say\u0131dan Ay Ad\u0131 Nas\u0131l Al\u0131n\u0131r"},"content":{"rendered":"<p># PostgreSQL&#8217;de Ay Ad\u0131n\u0131 Say\u0131dan Nas\u0131l Al\u0131r\u0131z?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda ay numaras\u0131 olarak saklanan verileriniz var ve bunlar\u0131 ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcrmeniz gerekiyor mu?  \u00d6rne\u011fin, bir sat\u0131\u015f raporunda 1, 2, 3 gibi ay numaralar\u0131 yerine Ocak, \u015eubat, Mart gibi ay adlar\u0131n\u0131 g\u00f6r\u00fcnt\u00fclemek istiyor olabilirsiniz.  Bu makalede, PostgreSQL&#8217;de ay numaras\u0131ndan ay ad\u0131n\u0131 almak i\u00e7in \u00e7e\u015fitli y\u00f6ntemleri, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  Bu rehber, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in faydal\u0131 bilgiler sunmaktad\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de Ay Ad\u0131 Alma: \u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, bilgi seviyenize g\u00f6re kademeli olarak ilerlemektedir.  Her b\u00f6l\u00fcmde, ad\u0131m ad\u0131m a\u00e7\u0131klamalar, kod \u00f6rnekleri ve ger\u00e7ek d\u00fcnya senaryolar\u0131 bulacaks\u0131n\u0131z.<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel fonksiyonlar ve basit kod \u00f6rnekleri ile ba\u015flayaca\u011f\u0131z.<\/p>\n<p><strong>Orta Seviye:<\/strong>  Ger\u00e7ek d\u00fcnya senaryolar\u0131, optimizasyon ipu\u00e7lar\u0131 ve daha karma\u015f\u0131k sorgu \u00f6rnekleri ele al\u0131nacakt\u0131r.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Performans analizi, edge case&#8217;ler ve daha geli\u015fmi\u015f teknikler incelenecektir.<\/p>\n<p><strong>Temel Kavramlar: Tarih ve Zaman Fonksiyonlar\u0131<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verileriyle \u00e7al\u0131\u015fmak i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Ay numaras\u0131ndan ay ad\u0131n\u0131 almak i\u00e7in <code class=\"language-\">to_char()<\/code> fonksiyonunu kullanaca\u011f\u0131z. Bu fonksiyon, tarih ve zaman de\u011ferlerini belirli bir formata g\u00f6re bi\u00e7imlendirir.  <code class=\"language-\">to_char()<\/code> fonksiyonunun kullan\u0131m\u0131 hakk\u0131nda daha detayl\u0131 bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL blog yaz\u0131lar\u0131n\u0131](https:\/\/fatihsoysal.com) inceleyebilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Ay Ad\u0131n\u0131 Say\u0131dan Alma: Uygulamal\u0131 K\u0131lavuz (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>En basit y\u00f6ntem, <code class=\"language-\">to_char()<\/code> fonksiyonunu kullanarak ay numaras\u0131ndan ay ad\u0131n\u0131 almak i\u00e7in bir tarih de\u011feri olu\u015fturmakt\u0131r.  \u00d6rne\u011fin, ay numaras\u0131 1 i\u00e7in Ocak ay\u0131n\u0131 almak i\u00e7in \u015fu sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char('2024-01-01'::date, 'Month'); -- Ocak<\/code><\/pre>\n<p>Burada <code class=\"language-\">'2024-01-01'::date<\/code> bir tarih de\u011feri olu\u015fturur ve <code class=\"language-\">'Month'<\/code> format belirteci ay ad\u0131n\u0131 verir.  Ay numaras\u0131n\u0131 bir de\u011fi\u015fken olarak kullanmak i\u00e7in ise \u015f\u00f6yle bir sorgu yazabiliriz:<\/p>\n<pre class=\"language-sql\"><code>DO $$\nDECLARE\n  ay_numarasi INTEGER := 3;\nBEGIN\n  RAISE NOTICE '%', to_char(make_date(2024, ay_numarasi, 1), 'Month'); -- Mart\nEND $$;<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code class=\"language-\">make_date()<\/code> fonksiyonu ile 2024 y\u0131l\u0131n\u0131n, <code class=\"language-\">ay_numarasi<\/code> de\u011fi\u015fkeninde tutulan ay numaras\u0131n\u0131n ve 1. g\u00fcn\u00fcn\u00fcn tarih de\u011ferini olu\u015fturuyoruz.  Sonras\u0131nda <code class=\"language-\">to_char()<\/code> fonksiyonu ile ay ad\u0131n\u0131 elde ediyoruz.  Bu y\u00f6ntemi kullanarak farkl\u0131 ay numaralar\u0131 i\u00e7in ay adlar\u0131n\u0131 kolayca alabilirsiniz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: Sat\u0131\u015f Raporlar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinde \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z\u0131 ve ayl\u0131k sat\u0131\u015f rakamlar\u0131n\u0131 i\u00e7eren bir tablo oldu\u011funuzu d\u00fc\u015f\u00fcn\u00fcn.  Bu tablodaki ay bilgisi ay numaras\u0131 olarak saklan\u0131yor.  A\u015fa\u011f\u0131daki sorgu, ay numaras\u0131n\u0131 ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcrerek daha okunabilir bir sat\u0131\u015f raporu olu\u015fturman\u0131za yard\u0131mc\u0131 olur:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n  to_char(make_date(2024, satislar.ay, 1), 'Month') AS ay_adi,\n  SUM(satislar.tutar) AS toplam_satis\nFROM\n  satislar\nGROUP BY\n  ay_adi\nORDER BY\n  ay_adi;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satislar<\/code> tablosundaki her ay i\u00e7in toplam sat\u0131\u015f tutar\u0131n\u0131 hesaplar ve ay numaras\u0131n\u0131 <code class=\"language-\">to_char()<\/code> fonksiyonu kullanarak ay ad\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  <code class=\"language-\">make_date()<\/code> fonksiyonu sayesinde her ay i\u00e7in ge\u00e7erli bir tarih de\u011feri olu\u015fturarak <code class=\"language-\">to_char()<\/code> fonksiyonunun do\u011fru \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar\u0131z.<\/p>\n<p><strong>Performans Optimizasyonu (Orta Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">to_char()<\/code> fonksiyonunun performans\u0131 etkileyebilece\u011fini unutmamak \u00f6nemlidir.  Performans\u0131 iyile\u015ftirmek i\u00e7in, ay numaralar\u0131n\u0131 \u00f6nceden ay adlar\u0131na d\u00f6n\u00fc\u015ft\u00fcrerek bir bak\u0131\u015f\u0131m tablosu (lookup table) olu\u015fturabilirsiniz.  Bu tablo, ay numaras\u0131 ve kar\u015f\u0131l\u0131k gelen ay ad\u0131n\u0131 i\u00e7erecektir.  Daha sonra sorguyu bu bak\u0131\u015f\u0131m tablosuna g\u00f6re yazabilirsiniz.  Bu y\u00f6ntem, \u00f6zellikle raporlama gibi s\u0131k\u00e7a tekrarlanan sorgularda performans art\u0131\u015f\u0131 sa\u011flayacakt\u0131r.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE ay_adi_bakisim (\n  ay_numarasi INTEGER PRIMARY KEY,\n  ay_adi TEXT\n);\n\nINSERT INTO ay_adi_bakisim (ay_numarasi, ay_adi) VALUES\n(1, 'Ocak'), (2, '\u015eubat'), (3, 'Mart'), (4, 'Nisan'), (5, 'May\u0131s'), (6, 'Haziran'),\n(7, 'Temmuz'), (8, 'A\u011fustos'), (9, 'Eyl\u00fcl'), (10, 'Ekim'), (11, 'Kas\u0131m'), (12, 'Aral\u0131k');\n\n\nSELECT\n  a.ay_adi,\n  SUM(s.tutar) AS toplam_satis\nFROM\n  satislar s\nJOIN\n  ay_adi_bakisim a ON s.ay = a.ay_numarasi\nGROUP BY\n  a.ay_adi\nORDER BY\n  a.ay_adi;<\/code><\/pre>\n<p><strong>Edge Case&#8217;ler ve Hata Y\u00f6netimi (\u0130leri Seviye)<\/strong><\/p>\n<p>Ay numaras\u0131 1 ile 12 aras\u0131nda de\u011filse, <code class=\"language-\">to_char()<\/code> fonksiyonu hata verebilir.  Bu durumu \u00f6nlemek i\u00e7in, <code class=\"language-\">CASE<\/code> ifadesi kullanarak ay numaras\u0131n\u0131 kontrol edebilir ve ge\u00e7ersiz de\u011ferler i\u00e7in varsay\u0131lan bir de\u011fer d\u00f6nd\u00fcrebilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n  CASE\n    WHEN satislar.ay BETWEEN 1 AND 12 THEN to_char(make_date(2024, satislar.ay, 1), 'Month')\n    ELSE 'Ge\u00e7ersiz Ay'\n  END AS ay_adi,\n  SUM(satislar.tutar) AS toplam_satis\nFROM\n  satislar\nGROUP BY\n  ay_adi\nORDER BY\n  ay_adi;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satislar.ay<\/code> de\u011feri 1 ile 12 aras\u0131nda de\u011filse &#8220;Ge\u00e7ersiz Ay&#8221; de\u011ferini d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Performans Analizi ve Optimizasyon Teknikleri (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans analizi yapmak ve sorguyu optimize etmek \u00f6nemlidir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu, sorguyu \u00e7al\u0131\u015ft\u0131rmadan \u00f6nce plan\u0131n\u0131 g\u00f6sterir ve performans bottleneck&#8217;lerini belirlemenize yard\u0131mc\u0131 olur.  \u0130ndeksler, \u00f6zellikle b\u00fcy\u00fck tablolarda performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.  <code class=\"language-\">satislar<\/code> tablosuna <code class=\"language-\">ay<\/code> s\u00fctununa bir indeks eklemek, sorgu performans\u0131n\u0131 iyile\u015ftirebilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de ay numaras\u0131ndan ay ad\u0131n\u0131 almak i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  <code class=\"language-\">to_char()<\/code> fonksiyonu basit ve etkili bir \u00e7\u00f6z\u00fcm sunarken, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in bak\u0131\u015f\u0131m tablosu ve indeks kullan\u0131m\u0131 performans\u0131 art\u0131r\u0131r.  Hata y\u00f6netimi ve performans analizi, uygulaman\u0131n sa\u011flaml\u0131\u011f\u0131n\u0131 ve verimlili\u011fini art\u0131r\u0131r.  Bu makalede ele al\u0131nan y\u00f6ntemleri kullanarak, PostgreSQL veritaban\u0131n\u0131zdaki tarih verilerini daha okunabilir ve kullan\u0131\u015fl\u0131 hale getirebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">to_char()<\/code> fonksiyonu hangi format belirticilerini destekler?<\/strong>  <code class=\"language-\">to_char()<\/code> fonksiyonunun destekledi\u011fi t\u00fcm format belirticileri PostgreSQL dok\u00fcmantasyonunda bulunabilir.<\/p>\n<p>2. <strong>Ay numaras\u0131 yerine ay ad\u0131n\u0131 kullanarak sorgu nas\u0131l yaz\u0131l\u0131r?<\/strong>  Ay ad\u0131n\u0131 kullanarak sorgu yazmak i\u00e7in <code class=\"language-\">LIKE<\/code> operat\u00f6r\u00fc ve <code class=\"language-\">to_char()<\/code> fonksiyonunu birlikte kullanabilirsiniz.<\/p>\n<p>3. <strong>Bak\u0131\u015f\u0131m tablosu kullanman\u0131n avantajlar\u0131 nelerdir?<\/strong>  Bak\u0131\u015f\u0131m tablosu, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans\u0131 art\u0131r\u0131r ve sorguyu daha okunabilir hale getirir.<\/p>\n<p>4. <strong>Performans\u0131 nas\u0131l daha da iyile\u015ftirebilirim?<\/strong>  Sorguyu optimize etmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabilir ve gerekli indeksleri ekleyebilirsiniz.<\/p>\n<p>5. <strong>Farkl\u0131 dil ayarlar\u0131nda ay adlar\u0131 nas\u0131l al\u0131n\u0131r?<\/strong>  PostgreSQL&#8217;in dil ayarlar\u0131n\u0131 de\u011fi\u015ftirerek farkl\u0131 dillerdeki ay adlar\u0131n\u0131 alabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Ay Ad\u0131n\u0131 Say\u0131dan Nas\u0131l Al\u0131r\u0131z? PostgreSQL veritaban\u0131n\u0131zda ay numaras\u0131 olarak saklanan verileriniz var ve bunlar\u0131 ay&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-25717","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: Say\u0131dan Ay Ad\u0131 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-sayidan-ay-adi-nasil-alinir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Say\u0131dan Ay Ad\u0131 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-sayidan-ay-adi-nasil-alinir\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-12T09:15:23+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-sayidan-ay-adi-nasil-alinir\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Say\u0131dan Ay Ad\u0131 Nas\u0131l Al\u0131n\u0131r\",\"datePublished\":\"2025-07-12T09:15:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/\"},\"wordCount\":917,\"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-sayidan-ay-adi-nasil-alinir\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/\",\"name\":\"PostgreSQL: Say\u0131dan Ay Ad\u0131 Nas\u0131l Al\u0131n\u0131r\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-07-12T09:15:23+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sayidan-ay-adi-nasil-alinir\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Say\u0131dan Ay Ad\u0131 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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