{"id":27366,"date":"2025-08-12T03:15:26","date_gmt":"2025-08-12T00:15:26","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-saate-gore-gruplandirma\/"},"modified":"2025-08-12T03:15:26","modified_gmt":"2025-08-12T00:15:26","slug":"postgresql-sonuclari-saate-gore-gruplandirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sonuclari-saate-gore-gruplandirma\/","title":{"rendered":"PostgreSQL: Sonu\u00e7lar\u0131 Saate G\u00f6re Grupland\u0131rma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Saatlere G\u00f6re Grupland\u0131rma: Ad\u0131m Ad\u0131m Rehber<\/p>\n<p><strong>Meta A\u00e7\u0131klamas\u0131:<\/strong> PostgreSQL veritaban\u0131n\u0131zdaki verileri saatlere g\u00f6re nas\u0131l gruplayaca\u011f\u0131n\u0131z\u0131 \u00f6\u011frenmek ister misiniz? Bu kapsaml\u0131 rehber, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in ad\u0131m ad\u0131m a\u00e7\u0131klamalar, ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon ipu\u00e7lar\u0131 sunuyor.  Saat bazl\u0131 veri analizine ba\u015flamak i\u00e7in hemen okuyun!<\/p>\n<p>Web uygulamalar\u0131, IoT cihazlar\u0131 ve g\u00fcnl\u00fck i\u015f s\u00fcre\u00e7leri gibi bir\u00e7ok senaryoda, verilerin zamana g\u00f6re analizi b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r.  \u00d6rne\u011fin, bir e-ticaret sitesinin saatlik sat\u0131\u015f verilerini analiz etmek, yo\u011funluk saatlerini belirlemek ve pazarlama stratejilerini optimize etmek i\u00e7in hayati \u00f6nem ta\u015f\u0131r.  PostgreSQL gibi g\u00fc\u00e7l\u00fc bir veritaban\u0131 y\u00f6netim sistemi kullan\u0131rken, bu t\u00fcr analizleri yapmak i\u00e7in verileri saatlere g\u00f6re grupland\u0131rman\u0131z gerekir. Bu makalede, PostgreSQL&#8217;de saatlere g\u00f6re grupland\u0131rmay\u0131 ad\u0131m ad\u0131m, yeni ba\u015flayanlardan uzman seviyesine kadar a\u00e7\u0131klayaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL Zaman Fonksiyonlar\u0131 ile Tan\u0131\u015fma<\/strong><\/p>\n<p>PostgreSQL, zaman verilerini i\u015flemek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Saatlere g\u00f6re grupland\u0131rma i\u015flemi i\u00e7in en \u00f6nemli fonksiyonlar <code class=\"language-\">EXTRACT<\/code>, <code class=\"language-\">DATE_TRUNC<\/code> ve <code class=\"language-\">TO_CHAR<\/code>&#8216;d\u0131r.  Bu fonksiyonlar\u0131n nas\u0131l kullan\u0131ld\u0131\u011f\u0131n\u0131 anlamak, saat bazl\u0131 grupland\u0131rman\u0131n temelini olu\u015fturur.<\/p>\n<p><code class=\"language-\">EXTRACT<\/code>:  Bu fonksiyon, tarih ve zaman verilerinden belirli bir bile\u015feni (y\u0131l, ay, g\u00fcn, saat, dakika, saniye vb.) ay\u0131klaman\u0131z\u0131 sa\u011flar. \u00d6rne\u011fin, <code class=\"language-\">EXTRACT(HOUR FROM timestamp_s\u00fctun)<\/code> ifadesi, <code class=\"language-\">timestamp_s\u00fctun<\/code>&#8216;daki her sat\u0131r\u0131n saat bilgisini d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><code class=\"language-\">DATE_TRUNC<\/code>: Bu fonksiyon, belirli bir zaman birimine g\u00f6re bir tarih ve zaman de\u011ferini yuvarlar.  \u00d6rne\u011fin, <code class=\"language-\">DATE_TRUNC('hour', timestamp_s\u00fctun)<\/code> ifadesi, <code class=\"language-\">timestamp_s\u00fctun<\/code>&#8216;daki her zaman de\u011ferini en yak\u0131n saatin ba\u015flang\u0131c\u0131na yuvarlar. Bu, saatlere g\u00f6re grupland\u0131rma i\u015flemlerinde tutarl\u0131l\u0131k sa\u011flar.<\/p>\n<p><code class=\"language-\">TO_CHAR<\/code>: Bu fonksiyon, tarih ve zaman de\u011ferlerini belirli bir formatta metin olarak d\u00f6nd\u00fcr\u00fcr.  Saatlere g\u00f6re grupland\u0131rmada, saat bilgisini metin format\u0131nda elde etmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>PostgreSQL&#8217;de Saatlere G\u00f6re Grupland\u0131rma: \u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong># Yeni Ba\u015flayan: Basit Kod \u00d6rne\u011fi<\/strong><\/p>\n<p>Diyelim ki <code class=\"language-\">loglar<\/code> ad\u0131nda bir tablomuz var ve bu tabloda <code class=\"language-\">olay_zamani<\/code> (timestamp) ad\u0131nda bir s\u00fctun bulunuyor.  Her sat\u0131r bir olay\u0131n zaman\u0131n\u0131 kaydediyor.  Saatlere g\u00f6re olay say\u0131s\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorgular\u0131 kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>-- EXTRACT fonksiyonu ile\nSELECT EXTRACT(HOUR FROM olay_zamani) AS saat, COUNT(*) AS olay_sayisi\nFROM loglar\nGROUP BY saat\nORDER BY saat;\n\n-- DATE_TRUNC fonksiyonu ile\nSELECT DATE_TRUNC('hour', olay_zamani) AS saat, COUNT(*) AS olay_sayisi\nFROM loglar\nGROUP BY saat\nORDER BY saat;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">olay_zamani<\/code> s\u00fctunundaki her saat i\u00e7in ka\u00e7 olay kaydedildi\u011fini g\u00f6sterir. <code class=\"language-\">EXTRACT<\/code> ve <code class=\"language-\">DATE_TRUNC<\/code> fonksiyonlar\u0131n\u0131n her ikisi de benzer sonu\u00e7lar verir, ancak <code class=\"language-\">DATE_TRUNC<\/code> daha okunabilir ve baz\u0131 durumlarda performans avantaj\u0131 sa\u011flayabilir.<\/p>\n<p><strong># Orta Seviye: Ger\u00e7ek Hayat \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>Bir e-ticaret sitesinin saatlik sat\u0131\u015f verilerini analiz etmek istedi\u011fimizi varsayal\u0131m.  <code class=\"language-\">satislar<\/code> ad\u0131nda bir tablomuz olsun ve bu tabloda <code class=\"language-\">satis_zamani<\/code> (timestamp) ve <code class=\"language-\">satis_tutari<\/code> (numeric) s\u00fctunlar\u0131 bulunsun.  Saatlik toplam sat\u0131\u015f tutar\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT DATE_TRUNC('hour', satis_zamani) AS saat, SUM(satis_tutari) AS toplam_satis\nFROM satislar\nGROUP BY saat\nORDER BY saat;<\/code><\/pre>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">satis_zamani<\/code> s\u00fctununa bir indeks eklemek, sorgunun performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>WHERE ko\u015fulu:<\/strong>  Belirli bir tarih aral\u0131\u011f\u0131 i\u00e7in saatlik sat\u0131\u015f verilerini analiz etmek istiyorsan\u0131z, <code class=\"language-\">WHERE<\/code> ko\u015fulu ekleyerek sorgunun verimini art\u0131rabilirsiniz. \u00d6rne\u011fin: <code class=\"language-\">WHERE satis_zamani BETWEEN '2024-10-26 00:00:00' AND '2024-10-27 00:00:00'<\/code><\/p>\n<p><strong># \u0130leri Seviye: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck bir veri k\u00fcmesiyle \u00e7al\u0131\u015f\u0131yorsan\u0131z, saatlere g\u00f6re grupland\u0131rma sorgusunun performans\u0131 d\u00fc\u015febilir.  Bu durumda, a\u015fa\u011f\u0131daki teknikleri kullanarak performans\u0131 optimize edebilirsiniz:<\/p>\n<p>* <strong>Materyalize G\u00f6r\u00fcn\u00fcmler (Materialized Views):<\/strong>  Saatlik toplam sat\u0131\u015f verilerini \u00f6nceden hesaplayarak bir materyalize g\u00f6r\u00fcn\u00fcm olu\u015fturabilirsiniz. Bu, tekrarlanan sorgular\u0131 h\u0131zland\u0131r\u0131r.<br \/>\n* <strong>Par\u00e7alama (Partitioning):<\/strong>  <code class=\"language-\">satislar<\/code> tablosunu zaman aral\u0131klar\u0131na g\u00f6re par\u00e7alara ay\u0131rarak sorgunun yaln\u0131zca ilgili par\u00e7alar\u0131 taramas\u0131n\u0131 sa\u011flayabilirsiniz.<br \/>\n* <strong>Analitik Fonksiyonlar:<\/strong>  <code class=\"language-\">WINDOW<\/code> fonksiyonlar\u0131 kullanarak saatlik toplam sat\u0131\u015flar\u0131n yan\u0131 s\u0131ra hareketli ortalama gibi ek istatistikleri de hesaplayabilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong><\/p>\n<p>* <strong>Saat dilimlerinin dikkate al\u0131nmas\u0131:<\/strong>  E\u011fer veriler farkl\u0131 saat dilimlerinde kaydedilmi\u015fse, <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonu kullanarak verileri ortak bir saat dilimine d\u00f6n\u00fc\u015ft\u00fcrmeniz gerekebilir.<br \/>\n* <strong>Bo\u015f de\u011ferler:<\/strong>  <code class=\"language-\">satis_zamani<\/code> s\u00fctununda bo\u015f de\u011ferler varsa, <code class=\"language-\">COALESCE<\/code> fonksiyonu kullanarak bunlar\u0131 i\u015flemeniz gerekebilir.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r?  Saat Dilimlerini Y\u00f6netmek<\/strong><\/p>\n<p>Verileriniz farkl\u0131 saat dilimlerinden geliyorsa, saatlere g\u00f6re grupland\u0131rma i\u015flemi s\u0131ras\u0131nda saat dilimlerini do\u011fru bir \u015fekilde y\u00f6netmek \u00e7ok \u00f6nemlidir.  <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonu, verileri belirli bir saat dilimine d\u00f6n\u00fc\u015ft\u00fcrmenize yard\u0131mc\u0131 olur.<\/p>\n<p>\u00d6rne\u011fin, UTC saat diliminde kaydedilmi\u015f verileri T\u00fcrkiye saat dilimine d\u00f6n\u00fc\u015ft\u00fcrmek ve saatlere g\u00f6re grupland\u0131rmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT DATE_TRUNC('hour', satis_zamani AT TIME ZONE 'UTC' AT TIME ZONE 'Europe\/Istanbul') AS saat, SUM(satis_tutari) AS toplam_satis\nFROM satislar\nGROUP BY saat\nORDER BY saat;<\/code><\/pre>\n<p>Bu sorgu, \u00f6nce <code class=\"language-\">satis_zamani<\/code> s\u00fctunundaki verileri UTC&#8217;den T\u00fcrkiye saat dilimine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr, daha sonra saatlere g\u00f6re grupland\u0131rma i\u015flemini ger\u00e7ekle\u015ftirir.  <code class=\"language-\">Europe\/Istanbul<\/code> yerine kendi saat diliminizi kullanabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Saatlere G\u00f6re Grupland\u0131rma: Ger\u00e7ek D\u00fcnya Vaka \u00c7al\u0131\u015fmalar\u0131<\/strong><\/p>\n<p><strong>Vaka 1: Web Sunucusu Loglar\u0131n\u0131n Analizi:<\/strong> Bir web sunucusunun loglar\u0131n\u0131 analiz ederek saatlik istek say\u0131s\u0131n\u0131 belirlemek istiyoruz.  Log tablosunda bir zaman damgas\u0131 s\u00fctunu bulunmaktad\u0131r.  Yukar\u0131da a\u00e7\u0131klanan y\u00f6ntemleri kullanarak, saatlik istek say\u0131s\u0131n\u0131 kolayca hesaplayabiliriz.  Bu analiz, sunucu performans\u0131n\u0131 izlemek ve kaynaklar\u0131 optimize etmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Vaka 2:  Sosyal Medya Etkile\u015fimlerinin Analizi:<\/strong>  Bir sosyal medya platformunun saatlik etkile\u015fim verilerini (be\u011feni, yorum, payla\u015f\u0131m) analiz ederek en aktif saatleri belirlemek istiyoruz.  Bu analiz, i\u00e7erik yay\u0131nlama stratejilerini optimize etmek ve daha fazla etkile\u015fim elde etmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Vaka 3:  \u00dcretim Hatt\u0131 Verimlili\u011finin Analizi:<\/strong>  Bir \u00fcretim hatt\u0131n\u0131n saatlik \u00fcretim verimlili\u011fini analiz ederek darbo\u011fazlar\u0131 tespit etmek ve verimlili\u011fi art\u0131rmak istiyoruz.  Bu analiz, \u00fcretim s\u00fcre\u00e7lerini iyile\u015ftirmek ve maliyetleri d\u00fc\u015f\u00fcrmek i\u00e7in kullan\u0131labilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL, verileri saatlere g\u00f6re grupland\u0131rmak i\u00e7in g\u00fc\u00e7l\u00fc ve esnek fonksiyonlar sunar.  Bu makalede, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in ad\u0131m ad\u0131m bir rehber sunduk.  Ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon ipu\u00e7lar\u0131 ile, verilerinizi etkili bir \u015fekilde analiz edebilir ve de\u011ferli bilgiler elde edebilirsiniz.  Daha fazla PostgreSQL ipucu ve \u00f6\u011fretici i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Saat dilimini nas\u0131l y\u00f6netebilirim?<\/strong> <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanarak verileri belirli bir saat dilimine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.<br \/>\n2. <strong>\u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans\u0131 nas\u0131l art\u0131rabilirim?<\/strong> Materyalize g\u00f6r\u00fcn\u00fcmler, par\u00e7alama ve indeksler kullanarak performans\u0131 optimize edebilirsiniz.<br \/>\n3. <strong>Bo\u015f zaman de\u011ferleriyle nas\u0131l ba\u015fa \u00e7\u0131kabilirim?<\/strong> <code class=\"language-\">COALESCE<\/code> fonksiyonu kullanarak bo\u015f de\u011ferleri i\u015fleyebilirsiniz.<br \/>\n4. <strong>Farkl\u0131 zaman birimlerine g\u00f6re nas\u0131l grupland\u0131rabilirim?<\/strong> <code class=\"language-\">DATE_TRUNC<\/code> fonksiyonunda &#8216;hour&#8217; yerine &#8216;day&#8217;, &#8216;minute&#8217; vb. kullanarak farkl\u0131 zaman birimlerine g\u00f6re grupland\u0131rma yapabilirsiniz.<br \/>\n5. <strong>Saatlik verilerin yan\u0131 s\u0131ra ba\u015fka istatistikler nas\u0131l hesaplayabilirim?<\/strong> <code class=\"language-\">SUM<\/code>, <code class=\"language-\">AVG<\/code>, <code class=\"language-\">MIN<\/code>, <code class=\"language-\">MAX<\/code> gibi toplama fonksiyonlar\u0131n\u0131 <code class=\"language-\">GROUP BY<\/code> ile birlikte kullanabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Saatlere G\u00f6re Grupland\u0131rma: Ad\u0131m Ad\u0131m Rehber Meta A\u00e7\u0131klamas\u0131: PostgreSQL veritaban\u0131n\u0131zdaki verileri saatlere g\u00f6re nas\u0131l gruplayaca\u011f\u0131n\u0131z\u0131 \u00f6\u011frenmek&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-27366","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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