{"id":27357,"date":"2025-08-12T00:15:24","date_gmt":"2025-08-11T21:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-haftaya-gore-gruplandirma\/"},"modified":"2025-08-12T00:15:24","modified_gmt":"2025-08-11T21:15:24","slug":"postgresql-sonuclari-haftaya-gore-gruplandirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-haftaya-gore-gruplandirma\/","title":{"rendered":"PostgreSQL: Sonu\u00e7lar\u0131 Haftaya G\u00f6re Grupland\u0131rma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Verileri Hafta Baz\u0131nda Grupland\u0131rma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda haftal\u0131k sat\u0131\u015flar\u0131, g\u00fcnl\u00fck kullan\u0131c\u0131 say\u0131lar\u0131n\u0131 veya di\u011fer zaman serilerine ba\u011fl\u0131 verileri analiz etmek mi istiyorsunuz?  Verilerinizi haftal\u0131k olarak gruplayarak anlaml\u0131 i\u00e7g\u00f6r\u00fcler elde etmek ve raporlama s\u00fcre\u00e7lerinizi kolayla\u015ft\u0131rmak m\u00fcmk\u00fcn. Bu makalede, PostgreSQL&#8217;de verileri hafta baz\u0131nda grupland\u0131rman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ele alaca\u011f\u0131z.  Yeni ba\u015flayanlardan ileri d\u00fczey kullan\u0131c\u0131lara kadar herkes i\u00e7in ad\u0131m ad\u0131m bir rehber sunuyoruz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de hafta baz\u0131nda grupland\u0131rmay\u0131 \u00f6\u011frenmek i\u00e7in \u00fc\u00e7 a\u015famal\u0131 bir yol haritas\u0131 sunar:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel fonksiyonlar ve basit bir \u00f6rnek ile ba\u015fl\u0131yoruz.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, performans optimizasyonu ipu\u00e7lar\u0131 ve daha karma\u015f\u0131k sorgular ele al\u0131n\u0131yor.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, s\u0131n\u0131r durumlar\u0131 (edge cases) ve geli\u015fmi\u015f optimizasyon stratejileri inceleniyor.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih ve Zaman \u0130\u015fleme Temelleri<\/strong><\/p>\n<p>PostgreSQL&#8217;de tarih ve zaman verilerini i\u015flemek i\u00e7in \u00e7e\u015fitli fonksiyonlar bulunur.  Bu fonksiyonlar, verileri hafta baz\u0131nda grupland\u0131rmak i\u00e7in temel olu\u015fturur.  \u00d6rne\u011fin, <code class=\"language-\">date_trunc()<\/code> fonksiyonu, bir tarih de\u011ferini belirli bir zaman birimine yuvarlar.  <code class=\"language-\">EXTRACT()<\/code> fonksiyonu ise tarih ve zamandan belirli bile\u015fenleri (y\u0131l, ay, hafta, g\u00fcn vb.) ay\u0131klar.  Bu fonksiyonlar\u0131n do\u011fru kullan\u0131m\u0131, verileri do\u011fru ve verimli bir \u015fekilde grupland\u0131rmak i\u00e7in kritik \u00f6neme sahiptir.  \u00d6rne\u011fin, <code class=\"language-\">date_trunc('week', tarih_sutunu)<\/code> ifadesi, <code class=\"language-\">tarih_sutunu<\/code>ndaki her tarihi haftan\u0131n ilk g\u00fcn\u00fcne yuvarlar.  Bu, haftal\u0131k grupland\u0131rma i\u00e7in temel bir ad\u0131m olu\u015fturur.  Hafta ba\u015flang\u0131\u00e7 g\u00fcn\u00fcn\u00fcn pazar m\u0131 yoksa pazartesi mi olaca\u011f\u0131, veritaban\u0131 ayarlar\u0131na ba\u011fl\u0131d\u0131r.  Bu ayar\u0131 kontrol etmek ve gerekti\u011finde de\u011fi\u015ftirmek \u00f6nemlidir.  Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL \u00fczerine yazd\u0131\u011f\u0131 detayl\u0131 makalelere](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p><strong>Haftal\u0131k Grupland\u0131rma: Ad\u0131m Ad\u0131m Uygulama<\/strong><\/p>\n<p>\u015eimdi, basit bir \u00f6rnek ile ba\u015flayal\u0131m.  <code class=\"language-\">satislar<\/code> ad\u0131nda bir tablomuz olsun ve bu tabloda <code class=\"language-\">satis_tarihi<\/code> ve <code class=\"language-\">satis_miktari<\/code> s\u00fctunlar\u0131 bulunsun.  A\u015fa\u011f\u0131daki SQL sorgusu, sat\u0131\u015flar\u0131 hafta baz\u0131nda gruplayarak her haftan\u0131n toplam sat\u0131\u015f miktar\u0131n\u0131 g\u00f6sterir:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('week', satis_tarihi) AS hafta,\n    SUM(satis_miktari) AS toplam_satis\nFROM\n    satislar\nGROUP BY\n    hafta\nORDER BY\n    hafta;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">date_trunc()<\/code> fonksiyonunu kullanarak <code class=\"language-\">satis_tarihi<\/code> s\u00fctunundaki her tarihi haftan\u0131n ilk g\u00fcn\u00fcne yuvarlar ve <code class=\"language-\">SUM()<\/code> fonksiyonu ile her haftan\u0131n toplam sat\u0131\u015f miktar\u0131n\u0131 hesaplar.  <code class=\"language-\">GROUP BY<\/code> deyimi, verileri hafta baz\u0131nda gruplar ve <code class=\"language-\">ORDER BY<\/code> deyimi, sonu\u00e7lar\u0131 tarih s\u0131ras\u0131na g\u00f6re s\u0131ralar.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryosu: E-Ticaret Veri Analizi<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinin g\u00fcnl\u00fck sat\u0131\u015f verilerini ele alal\u0131m.  Bu verileri haftal\u0131k olarak gruplayarak, sat\u0131\u015f trendlerini, yo\u011fun sat\u0131\u015f d\u00f6nemlerini ve pazarlama kampanyalar\u0131n\u0131n etkinli\u011fini analiz edebiliriz.  \u00d6rne\u011fin, a\u015fa\u011f\u0131daki sorgu, her haftan\u0131n toplam sat\u0131\u015f miktar\u0131n\u0131, ortalama sipari\u015f de\u011ferini ve sipari\u015f say\u0131s\u0131n\u0131 g\u00f6sterir:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('week', siparis_tarihi) AS hafta,\n    SUM(siparis_tutari) AS toplam_satis,\n    AVG(siparis_tutari) AS ortalama_siparis_degeri,\n    COUNT(*) AS siparis_sayisi\nFROM\n    siparisler\nGROUP BY\n    hafta\nORDER BY\n    hafta;<\/code><\/pre>\n<p>Bu sorgu, daha \u00f6nceki \u00f6rne\u011fe benzer \u015fekilde \u00e7al\u0131\u015f\u0131r, ancak ek olarak <code class=\"language-\">AVG()<\/code> ve <code class=\"language-\">COUNT()<\/code> fonksiyonlar\u0131n\u0131 kullanarak daha fazla bilgi sa\u011flar.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, performans optimizasyonu kritik \u00f6neme sahiptir.  A\u015fa\u011f\u0131daki ipu\u00e7lar\u0131, PostgreSQL&#8217;de hafta baz\u0131nda grupland\u0131rma sorgular\u0131n\u0131n performans\u0131n\u0131 art\u0131rmaya yard\u0131mc\u0131 olabilir:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong> <code class=\"language-\">satis_tarihi<\/code> s\u00fctununa bir indeks eklemek, sorgunun \u00e7al\u0131\u015fma s\u00fcresini \u00f6nemli \u00f6l\u00e7\u00fcde azaltabilir.<br \/>\n* <strong>WHERE ko\u015fulu:<\/strong> Gereksiz verileri filtrelemek i\u00e7in <code class=\"language-\">WHERE<\/code> ko\u015fulu kullan\u0131n. \u00d6rne\u011fin, belirli bir tarih aral\u0131\u011f\u0131ndaki verileri analiz etmek istiyorsan\u0131z, <code class=\"language-\">WHERE satis_tarihi BETWEEN '2023-01-01' AND '2023-12-31'<\/code> gibi bir ko\u015ful ekleyebilirsiniz.<br \/>\n* <strong>Fonksiyonel indeksler:<\/strong> <code class=\"language-\">date_trunc('week', satis_tarihi)<\/code> ifadesi \u00fczerine bir fonksiyonel indeks olu\u015fturmak, sorgunun performans\u0131n\u0131 art\u0131rabilir.<br \/>\n* <strong>Analiz:<\/strong> <code class=\"language-\">ANALYZE<\/code> komutu ile veritaban\u0131 istatistiklerini g\u00fcncelleyin. Bu, PostgreSQL&#8217;in sorgular\u0131 daha verimli planlamas\u0131na yard\u0131mc\u0131 olur.<\/p>\n<p><strong>\u0130leri D\u00fczey Konular: S\u0131n\u0131r Durumlar\u0131 ve Geli\u015fmi\u015f Optimizasyon<\/strong><\/p>\n<p>Baz\u0131 durumlarda, hafta baz\u0131nda grupland\u0131rma sorgular\u0131 beklenmedik sonu\u00e7lar \u00fcretebilir.  \u00d6rne\u011fin, farkl\u0131 zaman dilimlerinde saklanan veriler veya haftan\u0131n ba\u015flang\u0131\u00e7 g\u00fcn\u00fcn\u00fcn farkl\u0131 tan\u0131mlanmas\u0131 gibi durumlar, sorgular\u0131n do\u011fru \u00e7al\u0131\u015fmas\u0131n\u0131 etkileyebilir.  Bu t\u00fcr s\u0131n\u0131r durumlar\u0131n\u0131 tespit etmek ve \u00e7\u00f6zmek i\u00e7in dikkatli bir analiz ve test yap\u0131lmas\u0131 gerekir.  Ayr\u0131ca,  <code class=\"language-\">PARTITION<\/code> gibi geli\u015fmi\u015f PostgreSQL \u00f6zelliklerini kullanarak daha karma\u015f\u0131k grupland\u0131rma ve filtreleme i\u015flemlerini optimize edebilirsiniz.  Bu konular, daha fazla deneyim gerektirir ve detayl\u0131 ara\u015ft\u0131rma gerektirir. [Fatih Soysal&#8217;\u0131n sitesindeki](https:\/\/fatihsoysal.com) geli\u015fmi\u015f PostgreSQL konular\u0131 ile ilgili makaleler daha detayl\u0131 bilgi sa\u011flayabilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de verileri hafta baz\u0131nda grupland\u0131rmak, zaman serilerine ba\u011fl\u0131 verileri analiz etmek i\u00e7in g\u00fc\u00e7l\u00fc bir y\u00f6ntemdir.  Bu makalede, temel kavramlardan ileri d\u00fczey optimizasyon tekniklerine kadar geni\u015f bir yelpazede bilgi verdik.  Uygulamal\u0131 \u00f6rnekler ve ger\u00e7ek d\u00fcnya senaryolar\u0131 ile konuyu daha iyi anlaman\u0131za yard\u0131mc\u0131 olmaya \u00e7al\u0131\u015ft\u0131k.  Unutmay\u0131n ki, performans optimizasyonu, b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken kritik \u00f6neme sahiptir.  Uygun indeksleri kullanmak ve sorgular\u0131 optimize etmek, verimlili\u011fi \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Hafta ba\u015flang\u0131\u00e7 g\u00fcn\u00fc nas\u0131l de\u011fi\u015ftirilir?<\/strong>  PostgreSQL&#8217;in <code class=\"language-\">set datestyle<\/code> komutu ile yap\u0131labilir.  Ancak, bu, veritaban\u0131n\u0131n genel ayar\u0131n\u0131 de\u011fi\u015ftirir, bu y\u00fczden dikkatli olunmal\u0131d\u0131r.<br \/>\n2. <strong>\u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in hangi optimizasyon teknikleri \u00f6nerilir?<\/strong>  Par\u00e7al\u0131 tablolar (partitioned tables) ve materyalize g\u00f6r\u00fcn\u00fcmler (materialized views) kullan\u0131lmal\u0131d\u0131r.<br \/>\n3. <strong><code class=\"language-\">date_trunc()<\/code> fonksiyonu d\u0131\u015f\u0131nda hafta baz\u0131nda grupland\u0131rma i\u00e7in ba\u015fka y\u00f6ntemler var m\u0131?<\/strong>  <code class=\"language-\">EXTRACT(WEEK FROM tarih_sutunu)<\/code> kullan\u0131labilir, ancak hafta numaras\u0131 y\u0131l\u0131n ba\u015f\u0131ndan itibaren hesapland\u0131\u011f\u0131 i\u00e7in baz\u0131 durumlarda istenmeyen sonu\u00e7lar verebilir.<br \/>\n4. <strong>Farkl\u0131 zaman dilimlerinde saklanan verileri nas\u0131l i\u015fleyebiliriz?<\/strong>  <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonu kullan\u0131larak veriler ortak bir zaman dilimine d\u00f6n\u00fc\u015ft\u00fcr\u00fclebilir.<br \/>\n5. <strong>Performans sorunlar\u0131n\u0131 nas\u0131l tespit edebiliriz?<\/strong>  PostgreSQL&#8217;in <code class=\"language-\">EXPLAIN<\/code> komutu ile sorgular\u0131n y\u00fcr\u00fctme plan\u0131n\u0131 inceleyerek performans darbo\u011fazlar\u0131n\u0131 tespit edebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Verileri Hafta Baz\u0131nda Grupland\u0131rma PostgreSQL veritaban\u0131n\u0131zda haftal\u0131k sat\u0131\u015flar\u0131, g\u00fcnl\u00fck kullan\u0131c\u0131 say\u0131lar\u0131n\u0131 veya di\u011fer zaman serilerine ba\u011fl\u0131&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-27357","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) - 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