{"id":27815,"date":"2025-08-19T09:15:21","date_gmt":"2025-08-19T06:15:21","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-zaman-damgasindan-tarih-cikarma\/"},"modified":"2025-08-19T09:15:21","modified_gmt":"2025-08-19T06:15:21","slug":"postgresql-zaman-damgasindan-tarih-cikarma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-zaman-damgasindan-tarih-cikarma\/","title":{"rendered":"PostgreSQL: Zaman Damgas\u0131ndan Tarih \u00c7\u0131karma"},"content":{"rendered":"<p># PostgreSQL&#8217;den Tarih \u00c7\u0131karma: Zaman Damgas\u0131ndan Tarih Ay\u0131klama Rehberi<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda tarih ve zaman bilgilerini tutan bir zaman damgas\u0131 s\u00fctununuz var ve sadece tarih bilgisine ihtiyac\u0131n\u0131z m\u0131 var?  Bu makale, PostgreSQL&#8217;de zaman damgas\u0131ndan tarih \u00e7\u0131karma i\u015flemini ad\u0131m ad\u0131m, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi \u015fekilde a\u00e7\u0131klayacak.  Farkl\u0131 y\u00f6ntemleri, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ele alaca\u011f\u0131z.  PostgreSQL&#8217;de tarih manip\u00fclasyonunun inceliklerini ke\u015ffedin ve verilerinizi daha etkili bir \u015fekilde y\u00f6netin.<\/p>\n<p><strong>PostgreSQL&#8217;de Zaman Damgas\u0131 ve Tarih Veri Tipleri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman bilgilerini saklamak i\u00e7in farkl\u0131 veri tipleri sunar. Bunlardan en yayg\u0131n kullan\u0131lanlar\u0131 <code class=\"language-\">timestamp<\/code> ve <code class=\"language-\">date<\/code>&#8216;dir.  <code class=\"language-\">timestamp<\/code> veri tipi, tarih ve saati birlikte saklarken, <code class=\"language-\">date<\/code> veri tipi sadece tarihi saklar.  Bir zaman damgas\u0131ndan sadece tarih bilgisini ay\u0131klamak, veritaban\u0131 sorgular\u0131n\u0131z\u0131 optimize etmek ve raporlamay\u0131 kolayla\u015ft\u0131rmak i\u00e7in olduk\u00e7a \u00f6nemlidir.  <code class=\"language-\">timestamp<\/code> veri tipi genellikle <code class=\"language-\">YYYY-MM-DD HH:MM:SS<\/code> format\u0131nda verileri saklarken, <code class=\"language-\">date<\/code> veri tipi <code class=\"language-\">YYYY-MM-DD<\/code> format\u0131ndad\u0131r.  Bu farkl\u0131l\u0131k, veri i\u015fleme ve analiz s\u00fcre\u00e7lerinde \u00f6nemli rol oynar.  \u00d6rne\u011fin, bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015f raporlar\u0131n\u0131 olu\u015fturmak i\u00e7in sadece tarih bilgisine ihtiya\u00e7 duyulabilir. Bu durumda, <code class=\"language-\">timestamp<\/code> s\u00fctunundan sadece tarih k\u0131sm\u0131n\u0131 ay\u0131klamak performans a\u00e7\u0131s\u0131ndan avantaj sa\u011flar.<\/p>\n<p><strong>PostgreSQL&#8217;den Tarih \u00c7\u0131karma:  Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>Yeni ba\u015flayanlar i\u00e7in, PostgreSQL&#8217;de zaman damgas\u0131ndan tarih \u00e7\u0131karma i\u015flemi olduk\u00e7a basittir.  <code class=\"language-\">date()<\/code> fonksiyonunu kullanarak bunu kolayca yapabilirsiniz.<\/p>\n<p><strong>Ad\u0131m 1:<\/strong> Bir tablo olu\u015fturun ve i\u00e7ine zaman damgas\u0131 verisi ekleyin.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE orders (\n    order_id SERIAL PRIMARY KEY,\n    order_date timestamp\n);\n\nINSERT INTO orders (order_date) VALUES ('2024-10-27 10:30:00'), ('2024-10-26 15:45:00');<\/code><\/pre>\n<p><strong>Ad\u0131m 2:<\/strong> <code class=\"language-\">date()<\/code> fonksiyonunu kullanarak tarih bilgisini ay\u0131klay\u0131n.<\/p>\n<pre class=\"language-sql\"><code>SELECT order_id, date(order_date) AS order_date_only FROM orders;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">orders<\/code> tablosundaki her sat\u0131r i\u00e7in <code class=\"language-\">order_date<\/code> s\u00fctunundan sadece tarih bilgisini <code class=\"language-\">order_date_only<\/code> adl\u0131 yeni bir s\u00fctun alt\u0131nda d\u00f6nd\u00fcr\u00fcr.  Sonu\u00e7, sadece tarih bilgisini i\u00e7eren bir tablo olacakt\u0131r.<\/p>\n<p><strong>PostgreSQL Tarih \u00c7\u0131karma: Orta Seviye Kullan\u0131c\u0131lar \u0130\u00e7in Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi, daha ger\u00e7ek\u00e7i bir senaryo ele alal\u0131m. Bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015flar\u0131n\u0131 hesaplamam\u0131z gerekti\u011fini varsayal\u0131m.  <code class=\"language-\">orders<\/code> tablomuzda <code class=\"language-\">order_amount<\/code> adl\u0131 bir s\u00fctun ekleyelim ve g\u00fcnl\u00fck toplam sat\u0131\u015flar\u0131 hesaplayal\u0131m.<\/p>\n<pre class=\"language-sql\"><code>ALTER TABLE orders ADD COLUMN order_amount numeric;\n\nUPDATE orders SET order_amount = 100 WHERE order_id = 1;\nUPDATE orders SET order_amount = 50 WHERE order_id = 2;\n\nSELECT date(order_date) AS order_date, SUM(order_amount) AS total_sales\nFROM orders\nGROUP BY order_date\nORDER BY order_date;<\/code><\/pre>\n<p>Bu sorgu, her g\u00fcn i\u00e7in toplam sat\u0131\u015flar\u0131 hesaplar.  <code class=\"language-\">date()<\/code> fonksiyonu, <code class=\"language-\">order_date<\/code> s\u00fctunundan sadece tarih bilgisini al\u0131r ve <code class=\"language-\">GROUP BY<\/code> ile g\u00fcnl\u00fck toplamlar hesaplan\u0131r.  Performans\u0131 art\u0131rmak i\u00e7in, <code class=\"language-\">order_date<\/code> s\u00fctununa bir indeks ekleyebilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_order_date ON orders (order_date);<\/code><\/pre>\n<p>Bu indeks, <code class=\"language-\">order_date<\/code> s\u00fctununa g\u00f6re yap\u0131lan sorgular\u0131n h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.  Daha fazla optimizasyon i\u00e7in, [fatihsoysal.com](https:\/\/fatihsoysal.com) adresindeki PostgreSQL performans optimizasyonu makalelerine g\u00f6z atabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih Ay\u0131klama: \u0130leri Seviye Teknikler ve Performans Analizi<\/strong><\/p>\n<p>\u0130leri seviye kullan\u0131m senaryolar\u0131nda, farkl\u0131 tarih fonksiyonlar\u0131n\u0131 birle\u015ftirerek daha karma\u015f\u0131k sorgular olu\u015fturabilirsiniz. \u00d6rne\u011fin, belirli bir tarih aral\u0131\u011f\u0131ndaki sat\u0131\u015flar\u0131 hesaplamak isteyebilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT date(order_date) AS order_date, SUM(order_amount) AS total_sales\nFROM orders\nWHERE order_date BETWEEN '2024-10-25' AND '2024-10-27'\nGROUP BY order_date\nORDER BY order_date;<\/code><\/pre>\n<p>Bu sorgu, 25 Ekim 2024 ile 27 Ekim 2024 tarihleri aras\u0131ndaki sat\u0131\u015flar\u0131 hesaplar.  Performans analizi i\u00e7in, <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabilirsiniz.  Bu komut, sorgunun y\u00fcr\u00fct\u00fclme plan\u0131n\u0131 ve s\u00fcresini g\u00f6sterir.  Bu bilgiler, sorgunuzu optimize etmek i\u00e7in size yard\u0131mc\u0131 olacakt\u0131r.  Ayr\u0131ca, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, <code class=\"language-\">date_trunc()<\/code> fonksiyonu kullan\u0131larak ay veya y\u0131l gibi daha b\u00fcy\u00fck zaman dilimlerinde toplamalar yap\u0131labilir.<\/p>\n<p><strong>Edge Case&#8217;ler ve Hata Y\u00f6netimi<\/strong><\/p>\n<p>Zaman damgas\u0131 verilerinde bo\u015f de\u011ferler veya beklenmedik formatlar olabilir.  Bu durumlar i\u00e7in <code class=\"language-\">COALESCE()<\/code> fonksiyonu ve <code class=\"language-\">CASE<\/code> ifadeleri kullan\u0131labilir.  Bo\u015f de\u011ferleri handle etmek i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT COALESCE(date(order_date), '1900-01-01') AS order_date FROM orders;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">order_date<\/code> s\u00fctununda bo\u015f de\u011fer varsa,  &#8216;1900-01-01&#8217; tarihini kullan\u0131r.  Yanl\u0131\u015f formatl\u0131 veriler i\u00e7in ise, <code class=\"language-\">CASE<\/code> ifadeleri ile veri temizli\u011fi yap\u0131labilir.  Bu durumlar, veri kalitesinin \u00f6nemini vurgulamaktad\u0131r ve \u00f6nceden veri temizleme i\u015flemlerinin yap\u0131lmas\u0131 performans ve do\u011fruluk a\u00e7\u0131s\u0131ndan \u00f6nemlidir.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih \u00c7\u0131karma:  \u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> <code class=\"language-\">date()<\/code> fonksiyonunun basit kullan\u0131m\u0131, temel bir tablo \u00fczerinde tarih ay\u0131klama.  Yukar\u0131daki basit \u00f6rnekler referans al\u0131nabilir.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya \u00f6rne\u011fi (e-ticaret sat\u0131\u015flar\u0131), <code class=\"language-\">GROUP BY<\/code>, <code class=\"language-\">SUM()<\/code>, indeks kullan\u0131m\u0131 ve performans optimizasyonu ipu\u00e7lar\u0131.  Yukar\u0131daki e-ticaret \u00f6rne\u011fi ve indeksleme a\u00e7\u0131klamas\u0131 incelenmelidir.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code>, <code class=\"language-\">date_trunc()<\/code>, <code class=\"language-\">COALESCE()<\/code>, <code class=\"language-\">CASE<\/code> ifadeleri, edge case&#8217;ler ve hata y\u00f6netimi.  \u0130leri seviye \u00f6rnekler ve performans analizi teknikleri incelenmelidir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de zaman damgas\u0131ndan tarih \u00e7\u0131karma i\u015flemini farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in a\u00e7\u0131klad\u0131.  Basit sorgulardan karma\u015f\u0131k analizlere kadar \u00e7e\u015fitli senaryolar ele al\u0131nd\u0131.  Performans optimizasyonu ve hata y\u00f6netimi konular\u0131na da de\u011finildi.  Unutmay\u0131n ki, veritaban\u0131 performans\u0131 ve veri kalitesi, verimli bir veri y\u00f6netimi i\u00e7in kritik \u00f6neme sahiptir.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresinden daha fazla PostgreSQL bilgi ve e\u011fitimine ula\u015fabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <code class=\"language-\">date()<\/code> fonksiyonu d\u0131\u015f\u0131nda tarih \u00e7\u0131karmak i\u00e7in ba\u015fka fonksiyonlar var m\u0131?  Evet, <code class=\"language-\">to_char()<\/code> fonksiyonu da kullan\u0131labilir ancak <code class=\"language-\">date()<\/code> fonksiyonu daha verimlidir.<br \/>\n2. Bo\u015f zaman damgas\u0131 de\u011ferlerini nas\u0131l ele alabilirim? <code class=\"language-\">COALESCE()<\/code> fonksiyonu kullan\u0131labilir.<br \/>\n3. B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans\u0131 nas\u0131l optimize edebilirim? \u0130ndeksleme, <code class=\"language-\">date_trunc()<\/code> ve uygun WHERE ko\u015fullar\u0131 kullan\u0131m\u0131 \u00f6nemlidir.<br \/>\n4. Farkl\u0131 tarih formatlar\u0131n\u0131 nas\u0131l y\u00f6netebilirim? <code class=\"language-\">to_char()<\/code> ve <code class=\"language-\">to_timestamp()<\/code> fonksiyonlar\u0131 kullan\u0131labilir.<br \/>\n5. PostgreSQL&#8217;de tarih aritmeti\u011fi nas\u0131l yap\u0131l\u0131r?  <code class=\"language-\">INTERVAL<\/code> anahtar kelimesi kullan\u0131larak tarih aritmeti\u011fi yap\u0131labilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;den Tarih \u00c7\u0131karma: Zaman Damgas\u0131ndan Tarih Ay\u0131klama Rehberi PostgreSQL veritaban\u0131n\u0131zda tarih ve zaman bilgilerini tutan 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-27815","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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