{"id":27348,"date":"2025-08-11T21:17:33","date_gmt":"2025-08-11T18:17:33","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/"},"modified":"2025-08-11T21:17:33","modified_gmt":"2025-08-11T18:17:33","slug":"postgresql-sonuclari-ceyrege-gore-gruplandirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/","title":{"rendered":"PostgreSQL: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma"},"content":{"rendered":"<p># PostgreSQL&#8217;de \u00c7eyrekler Halinde Grupland\u0131rma Nas\u0131l Yap\u0131l\u0131r?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda tarih verilerinizle \u00e7al\u0131\u015f\u0131rken, verileri \u00e7eyrekler halinde grupland\u0131rmak, sat\u0131\u015f trendlerini analiz etmek, mevsimsel dalgalanmalar\u0131 tespit etmek veya d\u00f6nemsel raporlar olu\u015fturmak gibi bir\u00e7ok durumda hayati \u00f6nem ta\u015f\u0131r.  Bu makale, PostgreSQL&#8217;de verileri \u00e7eyrekler halinde grupland\u0131rman\u0131n farkl\u0131 y\u00f6ntemlerini, ad\u0131m ad\u0131m k\u0131lavuzlar\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ele alarak, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin faydalanabilece\u011fi kapsaml\u0131 bir rehber sunmaktad\u0131r.  PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc tarih i\u015flevlerini kullanarak verilerinizi analiz etmeyi ve anlaml\u0131 sonu\u00e7lar elde etmeyi \u00f6\u011freneceksiniz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, PostgreSQL&#8217;de \u00e7eyrek baz\u0131nda grupland\u0131rmay\u0131 \u00f6\u011frenmek i\u00e7in \u00fc\u00e7 seviyeden olu\u015fur:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> (Ad\u0131m ad\u0131m a\u00e7\u0131klama, Basit kod \u00f6rne\u011fi)<\/p>\n<p><strong>Orta:<\/strong> (Ger\u00e7ek hayat \u00f6rne\u011fi, Optimizasyon ipu\u00e7lar\u0131)<\/p>\n<p><strong>\u0130leri D\u00fczey:<\/strong> (Performans analizi, Edge caseler)<\/p>\n<p><strong>Temel Kavramlar: Tarih Fonksiyonlar\u0131 ve \u00c7eyrek Hesaplama<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verileriyle \u00e7al\u0131\u015fmak i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  \u00c7eyrek baz\u0131nda grupland\u0131rma i\u00e7in temel olarak <code class=\"language-\">EXTRACT<\/code> fonksiyonunu kullanaca\u011f\u0131z.  <code class=\"language-\">EXTRACT<\/code> fonksiyonu, bir tarih veya zaman de\u011ferinden belirli bir alan (y\u0131l, ay, g\u00fcn, \u00e7eyrek vb.) \u00e7\u0131karman\u0131za olanak tan\u0131r.  \u00c7eyre\u011fi elde etmek i\u00e7in <code class=\"language-\">EXTRACT(QUARTER FROM tarih_sutunu)<\/code> ifadesini kullan\u0131r\u0131z.  \u00d6rne\u011fin, <code class=\"language-\">2024-03-15<\/code> tarihi i\u00e7in <code class=\"language-\">EXTRACT(QUARTER FROM '2024-03-15')<\/code> ifadesi <code class=\"language-\">1<\/code> sonucunu (ilk \u00e7eyrek) verir.<\/p>\n<p>Ayr\u0131ca, <code class=\"language-\">date_part<\/code> fonksiyonu da ayn\u0131 i\u015fi yapar ve genellikle <code class=\"language-\">EXTRACT<\/code> fonksiyonuna tercih edilir \u00e7\u00fcnk\u00fc daha okunabilir bir s\u00f6zdizimi sunar.  <code class=\"language-\">date_part('quarter', tarih_sutunu)<\/code> ifadesi de ayn\u0131 sonucu \u00fcretir.<\/p>\n<p><strong>PostgreSQL&#8217;de \u00c7eyrek Baz\u0131nda Grupland\u0131rma Nas\u0131l Yap\u0131l\u0131r? (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>Basit bir \u00f6rnek \u00fczerinden ba\u015flayal\u0131m.  <code class=\"language-\">satislar<\/code> ad\u0131nda bir tablomuz oldu\u011funu ve bu tablonun <code class=\"language-\">satis_tarihi<\/code> ve <code class=\"language-\">satis_miktari<\/code> s\u00fctunlar\u0131n\u0131 i\u00e7erdi\u011fini varsayal\u0131m.  Her bir \u00e7eyrekteki toplam sat\u0131\u015f miktar\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    EXTRACT(QUARTER FROM satis_tarihi) AS \u00e7eyrek,\n    SUM(satis_miktari) AS toplam_satis\nFROM\n    satislar\nGROUP BY\n    \u00e7eyrek\nORDER BY\n    \u00e7eyrek;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">satis_tarihi<\/code> s\u00fctunundan \u00e7eyre\u011fi <code class=\"language-\">EXTRACT<\/code> fonksiyonu ile \u00e7\u0131kar\u0131r ve <code class=\"language-\">\u00e7eyrek<\/code> adl\u0131 yeni bir s\u00fctun olu\u015fturur.  Daha sonra <code class=\"language-\">SUM<\/code> fonksiyonu ile her \u00e7eyrekteki sat\u0131\u015f miktarlar\u0131n\u0131 toplar ve <code class=\"language-\">toplam_satis<\/code> s\u00fctununda g\u00f6sterir. Son olarak, <code class=\"language-\">GROUP BY<\/code> deyimi ile sonu\u00e7lar \u00e7eyre\u011fe g\u00f6re grupland\u0131r\u0131l\u0131r ve <code class=\"language-\">ORDER BY<\/code> deyimi ile \u00e7eyreklere g\u00f6re s\u0131ralan\u0131r.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: E-Ticaret Sat\u0131\u015f Analizi (Orta Seviye)<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinin g\u00fcnl\u00fck sat\u0131\u015f verilerini i\u00e7eren bir tablomuz olsun.  Bu verileri kullanarak her \u00e7eyrekteki toplam sat\u0131\u015f gelirini ve ortalama sipari\u015f de\u011ferini hesaplayabiliriz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    EXTRACT(YEAR FROM satis_tarihi) AS yil,\n    EXTRACT(QUARTER FROM satis_tarihi) AS \u00e7eyrek,\n    SUM(satis_tutari) AS toplam_gelir,\n    AVG(siparis_degeri) AS ortalama_siparis_degeri\nFROM\n    satislar\nGROUP BY\n    yil, \u00e7eyrek\nORDER BY\n    yil, \u00e7eyrek;<\/code><\/pre>\n<p>Bu sorgu, hem y\u0131l\u0131 hem de \u00e7eyre\u011fi grupland\u0131rma i\u015flemine dahil ederek daha detayl\u0131 bir analiz sa\u011flar.  <code class=\"language-\">AVG<\/code> fonksiyonu ile ortalama sipari\u015f de\u011ferini hesaplar.  Bu analiz, \u015firketin y\u0131ll\u0131k ve \u00e7eyreklik performans\u0131n\u0131 de\u011ferlendirmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, sorgu performans\u0131n\u0131 optimize etmek \u00f6nemlidir.  A\u015fa\u011f\u0131daki ipu\u00e7lar\u0131 performans\u0131 art\u0131rman\u0131za yard\u0131mc\u0131 olabilir:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong> <code class=\"language-\">satis_tarihi<\/code> s\u00fctununa bir indeks eklemek, sorgu y\u00fcr\u00fctme s\u00fcresini \u00f6nemli \u00f6l\u00e7\u00fcde azaltabilir.<br \/>\n* <strong>Fonksiyonel \u0130ndeksler:<\/strong> <code class=\"language-\">EXTRACT(QUARTER FROM satis_tarihi)<\/code> ifadesi \u00fczerinde bir fonksiyonel indeks olu\u015fturmak da performans\u0131 iyile\u015ftirebilir.<br \/>\n* <strong>WHERE ko\u015fullar\u0131:<\/strong> Gereksiz verileri filtrelemek i\u00e7in <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131 kullan\u0131n.  \u00d6rne\u011fin, belirli bir y\u0131l\u0131n verilerini analiz etmek istiyorsan\u0131z, <code class=\"language-\">WHERE EXTRACT(YEAR FROM satis_tarihi) = 2023<\/code> ko\u015fulunu ekleyebilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler:  Edge Case&#8217;ler ve Performans Analizi (\u0130leri Seviye)<\/strong><\/p>\n<p>Baz\u0131 durumlarda, daha karma\u015f\u0131k sorgular gerekebilir.  \u00d6rne\u011fin, her \u00e7eyrekteki sat\u0131\u015flar\u0131n \u00f6nceki \u00e7eyre\u011fe g\u00f6re y\u00fczdesel de\u011fi\u015fimini hesaplamak isteyebiliriz.  Bu, pencere fonksiyonlar\u0131 kullan\u0131larak yap\u0131labilir.  Ayr\u0131ca, verilerde eksik de\u011ferler veya hatalar varsa, bunlar\u0131 ele almak i\u00e7in ek i\u015flemler gerekebilir.<\/p>\n<p>Performans analizi i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu kullan\u0131labilir.  Bu komut, sorgu y\u00fcr\u00fctme plan\u0131n\u0131 ve her ad\u0131m\u0131n s\u00fcresini g\u00f6sterir.  Bu bilgi, sorguyu optimize etmek i\u00e7in kullan\u0131labilir.  [Fatih Soysal&#8217;\u0131n blogunda](https:\/\/fatihsoysal.com) PostgreSQL performans optimizasyonu hakk\u0131nda daha detayl\u0131 bilgi bulabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de \u00c7eyrek Baz\u0131nda Grupland\u0131rma: Uygulamada Dikkat Edilmesi Gereken Noktalar<\/strong><\/p>\n<p>* <strong>Veri Tipleri:<\/strong> <code class=\"language-\">satis_tarihi<\/code> s\u00fctununun do\u011fru tarih veya zaman veri tipinde oldu\u011fundan emin olun.<br \/>\n* <strong>Bo\u015f De\u011ferler:<\/strong> <code class=\"language-\">satis_tarihi<\/code> s\u00fctununda bo\u015f de\u011ferler varsa, bunlar\u0131 ele almak i\u00e7in <code class=\"language-\">COALESCE<\/code> veya <code class=\"language-\">NULLIF<\/code> gibi fonksiyonlar\u0131 kullan\u0131n.<br \/>\n* <strong>B\u00fcy\u00fck Veri K\u00fcmeleri:<\/strong> B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans optimizasyon tekniklerini uygulay\u0131n.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de verileri \u00e7eyrekler halinde grupland\u0131rmak, i\u015f zekas\u0131 ve veri analizi i\u00e7in g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Bu makalede ele al\u0131nan y\u00f6ntemler ve ipu\u00e7lar\u0131, verilerinizden anlaml\u0131 bilgiler \u00e7\u0131karmak i\u00e7in size yard\u0131mc\u0131 olacakt\u0131r.  Unutmay\u0131n ki, performans optimizasyonu b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in kritik \u00f6neme sahiptir.  [Fatih Soysal&#8217;\u0131n](https:\/\/fatihsoysal.com) web sitesini ziyaret ederek PostgreSQL ve veri analizi konular\u0131nda daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">EXTRACT<\/code> ve <code class=\"language-\">date_part<\/code> fonksiyonlar\u0131 aras\u0131nda fark var m\u0131d\u0131r?<\/strong>  Temelde ayn\u0131 i\u015fi yaparlar, ancak <code class=\"language-\">date_part<\/code> daha okunabilir bir s\u00f6zdizimine sahiptir.<\/p>\n<p>2. <strong>\u00c7eyrek baz\u0131nda grupland\u0131rma i\u00e7in ba\u015fka y\u00f6ntemler var m\u0131d\u0131r?<\/strong>  <code class=\"language-\">CASE<\/code> deyimi kullan\u0131larak da \u00e7eyrek hesaplamas\u0131 yap\u0131labilir, ancak <code class=\"language-\">EXTRACT<\/code> veya <code class=\"language-\">date_part<\/code> daha verimlidir.<\/p>\n<p>3. <strong>B\u00fcy\u00fck bir veri setinde performans nas\u0131l iyile\u015ftirilebilir?<\/strong>  \u0130ndeksler, fonksiyonel indeksler ve <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131 kullanarak sorguyu optimize edebilirsiniz.<\/p>\n<p>4. <strong>E\u011fer tarih s\u00fctununda NULL de\u011ferler varsa ne olur?<\/strong>  <code class=\"language-\">SUM<\/code> fonksiyonu NULL de\u011ferleri dikkate almaz, bu y\u00fczden toplam de\u011fer do\u011fru olmaz.  <code class=\"language-\">COALESCE<\/code> fonksiyonu ile NULL de\u011ferleri 0 veya ba\u015fka bir de\u011ferle de\u011fi\u015ftirebilirsiniz.<\/p>\n<p>5. <strong>Y\u0131ll\u0131k ve ayl\u0131k verileri ayn\u0131 sorgu ile nas\u0131l gruplayabilirim?<\/strong>  <code class=\"language-\">EXTRACT(YEAR FROM tarih)<\/code> ve <code class=\"language-\">EXTRACT(MONTH FROM tarih)<\/code> fonksiyonlar\u0131n\u0131 kullanarak y\u0131l ve ay baz\u0131nda grupland\u0131rma yapabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de \u00c7eyrekler Halinde Grupland\u0131rma Nas\u0131l Yap\u0131l\u0131r? PostgreSQL veritaban\u0131n\u0131zda tarih verilerinizle \u00e7al\u0131\u015f\u0131rken, verileri \u00e7eyrekler halinde grupland\u0131rmak, sat\u0131\u015f trendlerini&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-27348","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: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma<\/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-sonuclari-ceyrege-gore-gruplandirma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma\" \/>\n<meta property=\"og:description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-11T18:17:33+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=\"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-sonuclari-ceyrege-gore-gruplandirma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"PostgreSQL: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma\",\"datePublished\":\"2025-08-11T18:17:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\"},\"wordCount\":935,\"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-sonuclari-ceyrege-gore-gruplandirma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\",\"name\":\"PostgreSQL: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-08-11T18:17:33+00:00\",\"description\":\"Hi\u00e7bir etiketi bulunamad\u0131.\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-ceyrege-gore-gruplandirma\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL: Sonu\u00e7lar\u0131 \u00c7eyre\u011fe G\u00f6re Grupland\u0131rma\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - 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