{"id":27553,"date":"2025-08-15T12:15:23","date_gmt":"2025-08-15T09:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-zamanda-damgayi-en-yakin-dakikaya-yuvarlama\/"},"modified":"2025-08-15T12:15:23","modified_gmt":"2025-08-15T09:15:23","slug":"postgresql-zamanda-damgayi-en-yakin-dakikaya-yuvarlama","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-zamanda-damgayi-en-yakin-dakikaya-yuvarlama\/","title":{"rendered":"PostgreSQL: Zamanda Damgay\u0131 En Yak\u0131n Dakikaya Yuvarlama"},"content":{"rendered":"<p># PostgreSQL: Zaman Damgas\u0131n\u0131 En Yak\u0131n Dakikaya Yuvarlama<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda zaman damgas\u0131 verileriyle \u00e7al\u0131\u015f\u0131yorsan\u0131z, s\u0131kl\u0131kla bu verileri belirli bir zaman aral\u0131\u011f\u0131na yuvarlama ihtiyac\u0131 duyabilirsiniz. \u00d6rne\u011fin, bir web sunucusunun g\u00fcnl\u00fcklerini analiz ederken, her iste\u011fin ger\u00e7ekle\u015fti\u011fi dakikay\u0131 g\u00f6rmek yerine, isteklerin dakikal\u0131k aral\u0131klarla grupland\u0131r\u0131lm\u0131\u015f halini incelemek daha anlaml\u0131 olabilir.  Bu makalede, PostgreSQL&#8217;de zaman damgalar\u0131n\u0131 en yak\u0131n dakikaya yuvarlaman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  Veri analizi ve raporlaman\u0131zda daha temiz ve anlaml\u0131 sonu\u00e7lar elde etmenize yard\u0131mc\u0131 olacak pratik \u00e7\u00f6z\u00fcmler sunaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL Zaman Damgas\u0131 Yuvarlama: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, zaman ve tarih verilerini y\u00f6netmek i\u00e7in g\u00fc\u00e7l\u00fc fonksiyonlar sunar.  <code class=\"language-\">timestamp<\/code> veri tipi, tarih ve zaman bilgisini birlikte saklar.  Bu verileri manip\u00fcle etmek i\u00e7in bir\u00e7ok fonksiyon mevcuttur.  Zaman damgas\u0131n\u0131 en yak\u0131n dakikaya yuvarlamak i\u00e7in ise <code class=\"language-\">date_trunc<\/code> fonksiyonunu kullanaca\u011f\u0131z.  <code class=\"language-\">date_trunc<\/code> fonksiyonu, belirtilen bir zaman birimine g\u00f6re bir zaman damgas\u0131n\u0131 keser (yuvarlar).  \u00d6rne\u011fin, &#8216;minute&#8217; parametresiyle \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda, zaman damgas\u0131n\u0131 en yak\u0131n dakikaya yuvarlar.<\/p>\n<p><strong>PostgreSQL&#8217;de Zaman Damgas\u0131n\u0131 En Yak\u0131n Dakikaya Yuvarlama: 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>  \u00d6ncelikle basit bir \u00f6rnek \u00fczerinde \u00e7al\u0131\u015fal\u0131m. A\u015fa\u011f\u0131daki SQL komutu, <code class=\"language-\">'2024-10-27 10:15:30'<\/code> zaman damgas\u0131n\u0131 en yak\u0131n dakikaya yuvarlar:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('minute', '2024-10-27 10:15:30'::timestamp);<\/code><\/pre>\n<p>Bu komut, <code class=\"language-\">2024-10-27 10:15:00<\/code> sonucunu verir.  <code class=\"language-\">::timestamp<\/code> k\u0131sm\u0131, PostgreSQL&#8217;e verinin <code class=\"language-\">timestamp<\/code> tipi oldu\u011funu belirtir.<\/p>\n<p><strong>Ad\u0131m 2:<\/strong> \u015eimdi bir tablodaki zaman damgalar\u0131n\u0131 yuvarlayal\u0131m.  <code class=\"language-\">events<\/code> ad\u0131nda bir tablo oldu\u011funu ve i\u00e7inde <code class=\"language-\">event_time<\/code> ad\u0131nda bir <code class=\"language-\">timestamp<\/code> s\u00fctunu bulundu\u011funu varsayal\u0131m:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE events (\n    id SERIAL PRIMARY KEY,\n    event_time timestamp\n);\n\nINSERT INTO events (event_time) VALUES\n('2024-10-27 10:15:30'),\n('2024-10-27 10:15:45'),\n('2024-10-27 10:16:05');\n\nSELECT event_time, date_trunc('minute', event_time) AS rounded_time\nFROM events;<\/code><\/pre>\n<p>Bu sorgu, her <code class=\"language-\">event_time<\/code> de\u011ferini en yak\u0131n dakikaya yuvarlayarak <code class=\"language-\">rounded_time<\/code> s\u00fctununda g\u00f6sterir.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi:<\/strong> Bir e-ticaret sitesinin g\u00fcnl\u00fcklerini ele alal\u0131m.  Her sipari\u015fin zaman damgas\u0131 kaydedildi\u011fini varsayal\u0131m.  Sipari\u015flerin dakikal\u0131k aral\u0131klarla nas\u0131l da\u011f\u0131ld\u0131\u011f\u0131n\u0131 g\u00f6rmek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('minute', order_time) AS minute, COUNT(*) AS order_count\nFROM orders\nGROUP BY minute\nORDER BY minute;<\/code><\/pre>\n<p>Bu sorgu, her dakika i\u00e7in yap\u0131lan sipari\u015f say\u0131s\u0131n\u0131 g\u00f6sterir.  Bu sayede, sipari\u015f yo\u011funlu\u011funun zaman i\u00e7inde nas\u0131l de\u011fi\u015fti\u011fini analiz edebiliriz.<\/p>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong>  B\u00fcy\u00fck veritabanlar\u0131nda, <code class=\"language-\">date_trunc<\/code> fonksiyonunu kullan\u0131rken performans sorunlar\u0131 ya\u015fayabilirsiniz.  Bu sorunu \u00e7\u00f6zmek i\u00e7in indeksleme \u00f6nemlidir.  <code class=\"language-\">event_time<\/code> s\u00fctununa bir indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_event_time ON events (event_time);<\/code><\/pre>\n<p><strong>\u0130leri Seviye:<\/strong><\/p>\n<p><strong>Performans Analizi:<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu performans\u0131n\u0131 analiz edebiliriz.  Bu komut, sorguyu \u00e7al\u0131\u015ft\u0131r\u0131rken PostgreSQL&#8217;in yapt\u0131\u011f\u0131 i\u015flemleri ve her ad\u0131m\u0131n ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc g\u00f6sterir.  Performans sorunlar\u0131n\u0131 tespit etmek ve optimizasyon stratejileri geli\u015ftirmek i\u00e7in bu komutu kullanabilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong>  <code class=\"language-\">date_trunc<\/code> fonksiyonu, zaman dilimlerini do\u011fru bir \u015fekilde i\u015fler.  Farkl\u0131 zaman dilimlerinde \u00e7al\u0131\u015f\u0131rken dikkatli olmak \u00f6nemlidir.  Zaman dilimi ayarlar\u0131n\u0131 do\u011fru bir \u015fekilde yap\u0131land\u0131rmak, beklenmedik sonu\u00e7lardan ka\u00e7\u0131nman\u0131za yard\u0131mc\u0131 olur.  Ayr\u0131ca, <code class=\"language-\">NULL<\/code> de\u011ferlerle \u00e7al\u0131\u015f\u0131rken dikkatli olmal\u0131 ve bunlar\u0131 uygun \u015fekilde ele almal\u0131s\u0131n\u0131z.<\/p>\n<p><strong>PostgreSQL Zaman Damgas\u0131 Yuvarlama:  Ek Fonksiyonlar ve \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>PostgreSQL&#8217;de zaman damgas\u0131 i\u015flemleri i\u00e7in <code class=\"language-\">date_part<\/code> fonksiyonu da kullan\u0131labilir.  Bu fonksiyon, zaman damgas\u0131n\u0131n belirli bir par\u00e7as\u0131n\u0131 (saniye, dakika, saat vb.)  ayr\u0131ca elde etmemizi sa\u011flar.  \u00d6rne\u011fin, dakikay\u0131 elde etmek i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_part('minute', '2024-10-27 10:15:30'::timestamp);<\/code><\/pre>\n<p>Bu, yuvarlama i\u015flemi yerine sadece dakikay\u0131 verir.  Yuvarlama i\u015flemi i\u00e7in <code class=\"language-\">date_trunc<\/code> daha uygun ve okunabilir bir y\u00f6ntemdir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de zaman damgalar\u0131n\u0131 en yak\u0131n dakikaya yuvarlaman\u0131n farkl\u0131 y\u00f6ntemlerini, ger\u00e7ek d\u00fcnya \u00f6rneklerini ve performans optimizasyonlar\u0131n\u0131 inceledik.  <code class=\"language-\">date_trunc<\/code> fonksiyonunun \u00f6nemini ve kullan\u0131m\u0131n\u0131 \u00f6\u011frendik.  B\u00fcy\u00fck veritabanlar\u0131nda performans optimizasyonu i\u00e7in indeksleme stratejilerini ele ald\u0131k.  Umar\u0131m bu bilgiler, PostgreSQL veritaban\u0131n\u0131zda zaman damgas\u0131 verilerini daha etkili bir \u015fekilde i\u015flemenize yard\u0131mc\u0131 olur.  Daha fazla PostgreSQL ipucu ve teknikleri i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesini ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">date_trunc<\/code> fonksiyonu negatif zaman damgalar\u0131yla nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/strong>  <code class=\"language-\">date_trunc<\/code> fonksiyonu negatif zaman damgalar\u0131n\u0131 da do\u011fru bir \u015fekilde i\u015fler.  Sonu\u00e7, negatif bir zaman damgas\u0131 olabilir.<\/p>\n<p>2. <strong>Zaman dilimi ayarlar\u0131n\u0131 nas\u0131l kontrol edebilirim?<\/strong>  <code class=\"language-\">SET timezone<\/code> komutu ile zaman dilimini ayarlayabilirsiniz.  \u00d6rne\u011fin, <code class=\"language-\">SET timezone = 'Europe\/Istanbul';<\/code> komutu, zaman diliminizi \u0130stanbul&#8217;a ayarlar.<\/p>\n<p>3. <strong><code class=\"language-\">date_trunc<\/code> fonksiyonu ba\u015fka hangi zaman birimlerini destekler?<\/strong>  <code class=\"language-\">date_trunc<\/code> fonksiyonu, saniye, dakika, saat, g\u00fcn, ay, y\u0131l gibi bir\u00e7ok zaman birimini destekler.<\/p>\n<p>4. <strong>Performans sorunlar\u0131n\u0131 nas\u0131l \u00f6nleyebilirim?<\/strong>  \u0130ndeksleme, uygun sorgu optimizasyonu ve veritaban\u0131 tasar\u0131m\u0131n\u0131 dikkatlice planlamak performans sorunlar\u0131n\u0131 \u00f6nlemeye yard\u0131mc\u0131 olur.<\/p>\n<p>5. <strong>NULL de\u011ferleri nas\u0131l ele almal\u0131y\u0131m?<\/strong>  <code class=\"language-\">COALESCE<\/code> fonksiyonu veya <code class=\"language-\">CASE<\/code> ifadeleri kullanarak NULL de\u011ferleri i\u015fleyebilir ve varsay\u0131lan bir de\u011fer atayabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL: Zaman Damgas\u0131n\u0131 En Yak\u0131n Dakikaya Yuvarlama PostgreSQL veritaban\u0131n\u0131zda zaman damgas\u0131 verileriyle \u00e7al\u0131\u015f\u0131yorsan\u0131z, s\u0131kl\u0131kla bu verileri belirli&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-27553","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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