{"id":27796,"date":"2025-08-19T03:15:28","date_gmt":"2025-08-19T00:15:28","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-son-7-gunun-tum-kayitlarini-secme\/"},"modified":"2025-08-19T03:15:28","modified_gmt":"2025-08-19T00:15:28","slug":"postgresql-son-7-gunun-tum-kayitlarini-secme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-son-7-gunun-tum-kayitlarini-secme\/","title":{"rendered":"PostgreSQL: Son 7 G\u00fcn\u00fcn T\u00fcm Kay\u0131tlar\u0131n\u0131 Se\u00e7me"},"content":{"rendered":"<p># PostgreSQL&#8217;de Son 7 G\u00fcn\u00fcn Verilerini Se\u00e7mek<\/p>\n<p>Veri tabanlar\u0131yla \u00e7al\u0131\u015fan herkesin kar\u015f\u0131la\u015ft\u0131\u011f\u0131 yayg\u0131n bir problem: belirli bir zaman aral\u0131\u011f\u0131ndaki verileri se\u00e7mek.  \u00d6zellikle g\u00fcnl\u00fck i\u015flem kay\u0131tlar\u0131 tutan sistemlerde, son 7 g\u00fcn\u00fcn verilerini h\u0131zl\u0131 ve verimli bir \u015fekilde sorgulamak hayati \u00f6nem ta\u015f\u0131r. Bu makalede, PostgreSQL kullanarak son 7 g\u00fcn\u00fcn verilerini nas\u0131l se\u00e7ebilece\u011finizi ad\u0131m ad\u0131m, yeni ba\u015flayanlardan uzmanlara kadar herkesin anlayabilece\u011fi \u015fekilde a\u00e7\u0131klayaca\u011f\u0131z.  Farkl\u0131 senaryolar\u0131, performans optimizasyon tekniklerini ve olas\u0131 sorunlar\u0131 ele alarak, PostgreSQL&#8217;deki zaman tabanl\u0131 sorgulara dair kapsaml\u0131 bir rehber sunaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL Zaman Fonksiyonlar\u0131: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, tarihler ve zamanlarla \u00e7al\u0131\u015fmak i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  Bu fonksiyonlar\u0131 anlamak, son 7 g\u00fcn\u00fcn verilerini se\u00e7mek i\u00e7in kritik \u00f6neme sahiptir.  En \u00f6nemli fonksiyonlardan baz\u0131lar\u0131 \u015funlard\u0131r:<\/p>\n<p>* <strong><code class=\"language-\">NOW()<\/code>:<\/strong>  Mevcut tarihi ve saati d\u00f6nd\u00fcr\u00fcr.<br \/>\n* <strong><code class=\"language-\">CURRENT_DATE<\/code>:<\/strong> Mevcut tarihi d\u00f6nd\u00fcr\u00fcr.<br \/>\n* <strong><code class=\"language-\">CURRENT_TIME<\/code>:<\/strong> Mevcut saati d\u00f6nd\u00fcr\u00fcr.<br \/>\n* <strong><code class=\"language-\">DATE()<\/code>:<\/strong>  Tarih ve saat de\u011ferinden sadece tarih k\u0131sm\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.<br \/>\n* <strong><code class=\"language-\">INTERVAL<\/code>:<\/strong>  Tarih ve zamana belirli bir s\u00fcre eklemek veya \u00e7\u0131karmak i\u00e7in kullan\u0131l\u0131r (\u00f6rne\u011fin, <code class=\"language-\">INTERVAL '7 days'<\/code> yedi g\u00fcn).<\/p>\n<p>Bu fonksiyonlar\u0131 kullanarak, son 7 g\u00fcn\u00fcn ba\u015flang\u0131\u00e7 ve biti\u015f tarihlerini hesaplayabilir ve sorgular\u0131m\u0131zda kullanabiliriz.<\/p>\n<p><strong>Son 7 G\u00fcn\u00fcn Verilerini Se\u00e7me: Ad\u0131m Ad\u0131m Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p><strong>Ad\u0131m 1:<\/strong> Basit bir tablo olu\u015ftural\u0131m.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE orders (\n    order_id SERIAL PRIMARY KEY,\n    order_date TIMESTAMP WITH TIME ZONE,\n    amount NUMERIC\n);<\/code><\/pre>\n<p><strong>Ad\u0131m 2:<\/strong>  Tabloya baz\u0131 \u00f6rnek veriler ekleyelim.<\/p>\n<pre class=\"language-sql\"><code>INSERT INTO orders (order_date, amount) VALUES\n('2024-10-26 10:00:00', 100),\n('2024-10-27 15:30:00', 200),\n('2024-10-28 09:15:00', 150),\n('2024-10-30 12:45:00', 250),\n('2024-11-01 11:00:00', 300);<\/code><\/pre>\n<p><strong>Ad\u0131m 3:<\/strong> Son 7 g\u00fcn\u00fcn verilerini se\u00e7elim.<\/p>\n<pre class=\"language-sql\"><code>SELECT *\nFROM orders\nWHERE order_date &gt;= NOW() - INTERVAL '7 days';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">order_date<\/code> s\u00fctunundaki tarih ve saatin, mevcut tarihten 7 g\u00fcn \u00f6nceki tarihten b\u00fcy\u00fck veya e\u015fit oldu\u011fu kay\u0131tlar\u0131 se\u00e7er.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi:<\/strong> Bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015flar\u0131n\u0131 takip eden bir tablo d\u00fc\u015f\u00fcnelim.  Bu tabloda, her sat\u0131\u015f\u0131 temsil eden bir kay\u0131t bulunur ve <code class=\"language-\">sale_date<\/code> adl\u0131 bir s\u00fctun sat\u0131\u015f\u0131n yap\u0131ld\u0131\u011f\u0131 tarihi tutar.  Son 7 g\u00fcnl\u00fck sat\u0131\u015f toplam\u0131n\u0131 hesaplamak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT SUM(amount) AS total_sales\nFROM orders\nWHERE order_date &gt;= CURRENT_DATE - INTERVAL '7 days';<\/code><\/pre>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong>  <code class=\"language-\">order_date<\/code> s\u00fctununa bir indeks eklemek, sorgunun performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.  A\u015fa\u011f\u0131daki komutla indeks olu\u015fturabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_order_date ON orders (order_date);<\/code><\/pre>\n<p><strong>\u0130leri D\u00fczey:<\/strong><\/p>\n<p><strong>Performans Analizi:<\/strong>  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, sorgular\u0131n performans\u0131n\u0131 analiz etmek ve optimize etmek \u00f6nemlidir.  PostgreSQL&#8217;in <code class=\"language-\">EXPLAIN<\/code> komutu, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 g\u00f6sterir ve performans darbo\u011fazlar\u0131n\u0131 belirlemeye yard\u0131mc\u0131 olur.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>EXPLAIN SELECT * FROM orders WHERE order_date &gt;= NOW() - INTERVAL '7 days';<\/code><\/pre>\n<p><strong>Edge Case&#8217;ler:<\/strong>  Zaman dilimlerinin farkl\u0131l\u0131klar\u0131, beklenmedik sonu\u00e7lara yol a\u00e7abilir.  <code class=\"language-\">TIMESTAMP WITH TIME ZONE<\/code> veri tipi kullanarak zaman dilimlerini do\u011fru bir \u015fekilde y\u00f6netmek \u00f6nemlidir.  Farkl\u0131 zaman dilimlerindeki verilerle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanarak verileri belirli bir zaman dilimine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.<\/p>\n<p><strong>Son 7 G\u00fcn\u00fcn Verilerini Se\u00e7me: Geli\u015fmi\u015f Teknikler ve Senaryolar<\/strong><\/p>\n<p><strong># <strong>Zamana Dayal\u0131 Filtreleme: Daha Fazla Esneklik<\/strong><\/strong><\/p>\n<p>Yukar\u0131daki \u00f6rneklerde, tam olarak son 7 g\u00fcn\u00fc kapsayan bir filtre kulland\u0131k.  Ancak, daha spesifik filtrelemelere ihtiya\u00e7 duyabilece\u011finiz durumlar olabilir. \u00d6rne\u011fin, son 7 g\u00fcn\u00fcn sadece belirli bir saat aral\u0131\u011f\u0131n\u0131 (\u00f6rne\u011fin, sadece sabah saatlerindeki verileri) se\u00e7mek isteyebilirsiniz.  Bu durumda, <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fc ve <code class=\"language-\">TIME<\/code> fonksiyonunu birle\u015ftirebilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT *\nFROM orders\nWHERE order_date BETWEEN NOW() - INTERVAL '7 days' AND NOW()\n  AND EXTRACT(HOUR FROM order_date) BETWEEN 9 AND 12; -- 09:00 - 12:00 aras\u0131<\/code><\/pre>\n<p>Bu sorgu, son 7 g\u00fcn i\u00e7inde saat 09:00 ile 12:00 aras\u0131nda yap\u0131lan sipari\u015fleri se\u00e7er.<\/p>\n<p><strong># <strong>Hafta \u0130\u00e7i ve Hafta Sonu Verilerinin Ayr\u0131lmas\u0131<\/strong><\/strong><\/p>\n<p>\u0130\u015fletme analizi i\u00e7in, hafta i\u00e7i ve hafta sonu verilerini ayr\u0131 ayr\u0131 incelemek faydal\u0131 olabilir.  PostgreSQL&#8217;in <code class=\"language-\">EXTRACT<\/code> fonksiyonu ile <code class=\"language-\">DOW<\/code> (day of week) kullanarak bunu yapabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    CASE\n        WHEN EXTRACT(DOW FROM order_date) BETWEEN 1 AND 5 THEN 'Hafta \u0130\u00e7i'\n        ELSE 'Hafta Sonu'\n    END AS gun_turu,\n    SUM(amount) AS toplam_tutar\nFROM orders\nWHERE order_date &gt;= NOW() - INTERVAL '7 days'\nGROUP BY gun_turu;<\/code><\/pre>\n<p>Bu sorgu, son 7 g\u00fcn\u00fcn verilerini hafta i\u00e7i ve hafta sonu olarak grupland\u0131rarak her bir grup i\u00e7in toplam sat\u0131\u015f miktar\u0131n\u0131 hesaplar.  (Not: <code class=\"language-\">EXTRACT(DOW FROM order_date)<\/code>  0 (Pazar) ile 6 (Cumartesi) aras\u0131nda bir de\u011fer d\u00f6nd\u00fcr\u00fcr.)<\/p>\n<p><strong># <strong>Performans Optimizasyonu: \u0130ndeks Kullan\u0131m\u0131 ve Planlama<\/strong><\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, sorgu performans\u0131 kritik \u00f6nem ta\u015f\u0131r.  <code class=\"language-\">order_date<\/code> s\u00fctununa bir indeks eklemek, \u00f6zellikle <code class=\"language-\">WHERE<\/code> ko\u015fulunda bu s\u00fctunu kullanan sorgular\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.  Daha \u00f6nce de belirtti\u011fimiz gibi, <code class=\"language-\">CREATE INDEX<\/code> komutu ile indeks olu\u015fturabilirsiniz.  Ayr\u0131ca, <code class=\"language-\">EXPLAIN<\/code> komutu ile sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 inceleyerek, performans darbo\u011fazlar\u0131n\u0131 tespit edebilir ve sorguyu optimize edebilirsiniz.  \u00d6rne\u011fin, indeks kullan\u0131m\u0131yla ilgili sorunlar varsa, PostgreSQL&#8217;in indeks kullan\u0131m\u0131n\u0131 optimize etmek i\u00e7in \u00e7e\u015fitli ayarlar\u0131 vard\u0131r.  Bunlar\u0131 ara\u015ft\u0131rmak ve do\u011fru ayarlar\u0131 bulmak, sorgu performans\u0131n\u0131 iyile\u015ftirmenize yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL, son 7 g\u00fcn\u00fcn verilerini se\u00e7mek i\u00e7in esnek ve g\u00fc\u00e7l\u00fc fonksiyonlar sunmaktad\u0131r.  Bu makalede ele ald\u0131\u011f\u0131m\u0131z \u00f6rnekler ve teknikler, farkl\u0131 senaryolara uygulanabilir ve performans optimizasyonu i\u00e7in ipu\u00e7lar\u0131 vermi\u015ftir.  Ancak, her veri k\u00fcmesi ve uygulama farkl\u0131 oldu\u011fundan, en uygun yakla\u015f\u0131m\u0131 belirlemek i\u00e7in kendi verileriniz \u00fczerinde testler yapman\u0131z \u00f6nemlidir.  Veri taban\u0131n\u0131z\u0131 ve sorgular\u0131n\u0131z\u0131 iyile\u015ftirmek i\u00e7in  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresindeki di\u011fer makalelere de g\u00f6z atabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">TIMESTAMP<\/code> ve <code class=\"language-\">TIMESTAMP WITH TIME ZONE<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">TIMESTAMP WITH TIME ZONE<\/code>, zaman dilimini saklarken <code class=\"language-\">TIMESTAMP<\/code> sadece tarihi ve saati saklar. Zaman dilimi \u00f6nemliyse <code class=\"language-\">TIMESTAMP WITH TIME ZONE<\/code> kullan\u0131lmal\u0131d\u0131r.<\/p>\n<p>2. <strong>Son 7 g\u00fcn yerine son X g\u00fcn\u00fcn verilerini nas\u0131l se\u00e7erim?<\/strong>  <code class=\"language-\">INTERVAL '7 days'<\/code> yerine <code class=\"language-\">INTERVAL 'X days'<\/code> kullan\u0131n, burada X istedi\u011finiz g\u00fcn say\u0131s\u0131d\u0131r.<\/p>\n<p>3. <strong>\u00c7ok b\u00fcy\u00fck bir tabloda son 7 g\u00fcn\u00fcn verilerini se\u00e7mek performans\u0131 nas\u0131l etkiler?<\/strong>  Performans d\u00fc\u015f\u00fc\u015f\u00fcn\u00fc \u00f6nlemek i\u00e7in <code class=\"language-\">order_date<\/code> s\u00fctununa indeks ekleyin ve <code class=\"language-\">EXPLAIN<\/code> komutu ile sorguyu optimize edin.<\/p>\n<p>4. <strong>Zaman aral\u0131\u011f\u0131na g\u00f6re verileri nas\u0131l grupland\u0131r\u0131r\u0131m?<\/strong>  <code class=\"language-\">GROUP BY<\/code> ve <code class=\"language-\">DATE_TRUNC<\/code> fonksiyonlar\u0131n\u0131 kullanarak zaman aral\u0131klar\u0131na g\u00f6re grupland\u0131rma yapabilirsiniz.<\/p>\n<p>5. <strong>Zaman dilimi d\u00f6n\u00fc\u015f\u00fcmleri nas\u0131l yap\u0131l\u0131r?<\/strong> <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanarak verileri belirli bir zaman dilimine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Son 7 G\u00fcn\u00fcn Verilerini Se\u00e7mek Veri tabanlar\u0131yla \u00e7al\u0131\u015fan herkesin kar\u015f\u0131la\u015ft\u0131\u011f\u0131 yayg\u0131n bir problem: belirli bir zaman&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-27796","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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