{"id":25146,"date":"2025-07-02T00:15:23","date_gmt":"2025-07-01T21:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-baslangicini-alma\/"},"modified":"2025-07-02T00:15:23","modified_gmt":"2025-07-01T21:15:23","slug":"postgresql-gunun-baslangicini-alma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-gunun-baslangicini-alma\/","title":{"rendered":"PostgreSQL: G\u00fcn\u00fcn Ba\u015flang\u0131c\u0131n\u0131 Alma"},"content":{"rendered":"<p># PostgreSQL&#8217;de G\u00fcn\u00fcn Ba\u015flang\u0131c\u0131n\u0131 Nas\u0131l Buluruz?<\/p>\n<p>**Meta A\u00e7\u0131klamas\u0131:** PostgreSQL veritaban\u0131n\u0131zda bir tarihin g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 (00:00:00) nas\u0131l elde edersiniz? Bu makale, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in ad\u0131m ad\u0131m bir rehber sunuyor. Ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon ipu\u00e7lar\u0131yla PostgreSQL&#8217;de tarih manip\u00fclasyonunu \u00f6\u011frenin.<\/p>\n<p>Veri analizi yaparken, raporlama olu\u015ftururken veya zaman serileriyle \u00e7al\u0131\u015f\u0131rken s\u0131kl\u0131kla bir tarihin g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 (00:00:00) bilmemiz gerekir.  \u00d6rne\u011fin, g\u00fcnl\u00fck sat\u0131\u015flar\u0131 \u00f6zetlemek, belirli bir g\u00fcnde ger\u00e7ekle\u015fen olaylar\u0131 saymak veya bir raporlama periyodunun ba\u015flang\u0131\u00e7 ve biti\u015f tarihini belirlemek isteyebilirsiniz. PostgreSQL, bu i\u015flemi kolayla\u015ft\u0131ran g\u00fc\u00e7l\u00fc tarih ve zaman fonksiyonlar\u0131 sunmaktad\u0131r. Bu makale, PostgreSQL&#8217;de bir tarihin g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 bulman\u0131n farkl\u0131 y\u00f6ntemlerini, ger\u00e7ek d\u00fcnya \u00f6rneklerini ve performans optimizasyon tekniklerini ad\u0131m ad\u0131m a\u00e7\u0131klayacakt\u0131r.  Bu rehber, yeni ba\u015flayanlardan ileri seviye PostgreSQL kullan\u0131c\u0131lar\u0131na kadar herkes i\u00e7in faydal\u0131 olacakt\u0131r.<\/p>\n<p>## PostgreSQL Tarih ve Zaman Fonksiyonlar\u0131na Giri\u015f<\/p>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc tarih ve zaman veri tipleri ve fonksiyonlar\u0131 sunar.  <code class=\"language-\">date<\/code> veri tipi yaln\u0131zca tarihi (YYYY-MM-DD) saklarken, <code class=\"language-\">timestamp<\/code> veri tipi tarih ve saati (YYYY-MM-DD HH:MM:SS) saklar.  Bu makalede, <code class=\"language-\">date<\/code> ve <code class=\"language-\">timestamp<\/code> tiplerini kullanarak g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 nas\u0131l bulaca\u011f\u0131m\u0131z\u0131 g\u00f6rece\u011fiz.  <code class=\"language-\">timestamp with time zone<\/code> gibi daha geli\u015fmi\u015f veri tipleri de mevcuttur ancak bu makalede temel kavramlara odaklanaca\u011f\u0131z.  PostgreSQL&#8217;in sundu\u011fu tarih fonksiyonlar\u0131n\u0131 anlamak, verimli sorgu yaz\u0131m\u0131 i\u00e7in olduk\u00e7a \u00f6nemlidir.  Bu fonksiyonlar sayesinde karma\u015f\u0131k tarihsel hesaplamalar kolayca yap\u0131labilir ve veriler \u00fczerinde daha etkili analizler ger\u00e7ekle\u015ftirilebilir.  \u00d6rne\u011fin, <code class=\"language-\">date_trunc()<\/code> fonksiyonu, bir tarih veya zaman de\u011ferini belirli bir zaman birimine g\u00f6re yuvarlamaya olanak tan\u0131r.<\/p>\n<p>## G\u00fcn\u00fcn Ba\u015flang\u0131c\u0131n\u0131 Bulman\u0131n Temel Y\u00f6ntemi: <code class=\"language-\">date_trunc()<\/code> Fonksiyonu<\/p>\n<p>PostgreSQL&#8217;de g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 bulman\u0131n en yayg\u0131n ve etkili yolu <code class=\"language-\">date_trunc()<\/code> fonksiyonudur. Bu fonksiyon, bir tarih veya zaman de\u011ferini belirli bir zaman birimine g\u00f6re yuvarlar.  Bizim durumumuzda, zaman birimi olarak &#8216;day&#8217; (g\u00fcn) kullanaca\u011f\u0131z.<\/p>\n<p>**\u00d6\u011frenme Yol Haritas\u0131:**<\/p>\n<p>**Yeni Ba\u015flayan:**<\/p>\n<p>Ad\u0131m ad\u0131m a\u00e7\u0131klama:<\/p>\n<p>1. <code class=\"language-\">date_trunc('day', tarih_s\u00fctunu)<\/code> fonksiyonunu kullan\u0131n.  <code class=\"language-\">tarih_s\u00fctunu<\/code> yerine tarih veya zaman de\u011ferini i\u00e7eren s\u00fctun ad\u0131n\u0131 yaz\u0131n.<br \/>\n2. Sonu\u00e7, belirtilen tarihin 00:00:00 saatini i\u00e7eren bir <code class=\"language-\">timestamp<\/code> de\u011feri olacakt\u0131r.<\/p>\n<p>Basit kod \u00f6rne\u011fi:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('day', '2024-03-15 14:30:00'::timestamp);\n-- Sonu\u00e7: 2024-03-15 00:00:00<\/code><\/pre>\n<p>**Orta:**<\/p>\n<p>Ger\u00e7ek hayat \u00f6rne\u011fi:  Bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015flar\u0131n\u0131 hesaplamak istedi\u011fimizi varsayal\u0131m.  <code class=\"language-\">orders<\/code> tablosunda <code class=\"language-\">order_date<\/code> (timestamp) s\u00fctunu bulunmaktad\u0131r.  G\u00fcnl\u00fck sat\u0131\u015flar\u0131 hesaplamak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('day', order_date) AS order_day,\n    SUM(order_total) AS daily_sales\nFROM\n    orders\nGROUP BY\n    order_day\nORDER BY\n    order_day;<\/code><\/pre>\n<p>Optimizasyon ipu\u00e7lar\u0131:  <code class=\"language-\">date_trunc()<\/code> fonksiyonu \u00fczerinde indeks olu\u015fturmak, \u00f6zellikle b\u00fcy\u00fck veri setlerinde sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.  <code class=\"language-\">order_date<\/code> s\u00fctunu \u00fczerinde bir indeks olu\u015fturmak i\u00e7in a\u015fa\u011f\u0131daki komutu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_order_date ON orders (order_date);<\/code><\/pre>\n<p>**\u0130leri D\u00fczey:**<\/p>\n<p>Performans analizi:  B\u00fcy\u00fck veri setlerinde <code class=\"language-\">date_trunc()<\/code> fonksiyonunun performans\u0131n\u0131 analiz etmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabilirsiniz.  Bu komut, sorguyu y\u00fcr\u00fctmek i\u00e7in PostgreSQL&#8217;in kulland\u0131\u011f\u0131 plan\u0131 ve performans istatistiklerini g\u00f6sterir.<\/p>\n<p>Edge caseler:  <code class=\"language-\">NULL<\/code> de\u011ferleri olan tarih s\u00fctunlar\u0131n\u0131 ele almak i\u00e7in <code class=\"language-\">COALESCE()<\/code> fonksiyonunu kullanabilirsiniz.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('day', COALESCE(order_date, CURRENT_DATE)) AS order_day FROM orders;<\/code><\/pre>\n<p>Bu, <code class=\"language-\">order_date<\/code> s\u00fctununda <code class=\"language-\">NULL<\/code> de\u011fer varsa, g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 hesaplamak i\u00e7in g\u00fcn\u00fcn bug\u00fcnk\u00fc tarihini kullan\u0131r.<\/p>\n<p>## Alternatif Y\u00f6ntemler:  <code class=\"language-\">make_date()<\/code> ve <code class=\"language-\">make_timestamp()<\/code> Fonksiyonlar\u0131<\/p>\n<p><code class=\"language-\">date_trunc()<\/code> fonksiyonuna ek olarak, <code class=\"language-\">make_date()<\/code> ve <code class=\"language-\">make_timestamp()<\/code> fonksiyonlar\u0131n\u0131 kullanarak da g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 elde edebiliriz.  Bunlar, y\u0131l, ay ve g\u00fcn de\u011ferlerinden bir tarih veya zaman de\u011feri olu\u015fturmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n<pre class=\"language-sql\"><code>SELECT make_date(EXTRACT(YEAR FROM '2024-03-15 14:30:00'::timestamp), EXTRACT(MONTH FROM '2024-03-15 14:30:00'::timestamp), EXTRACT(DAY FROM '2024-03-15 14:30:00'::timestamp))::timestamp;\n--Sonu\u00e7: 2024-03-15 00:00:00<\/code><\/pre>\n<p>Bu y\u00f6ntem, <code class=\"language-\">date_trunc()<\/code> kadar verimli olmayabilir, \u00f6zellikle b\u00fcy\u00fck veri setlerinde.  Bu nedenle, <code class=\"language-\">date_trunc()<\/code> fonksiyonu genellikle tercih edilir.<\/p>\n<p>## Vaka Analizi:  Bir \u00dcniversitenin \u00d6\u011frenci Kay\u0131tlar\u0131n\u0131 Analiz Etmek<\/p>\n<p>Bir \u00fcniversite, \u00f6\u011frenci kay\u0131tlar\u0131n\u0131 analiz etmek ve her g\u00fcn ka\u00e7 \u00f6\u011frencinin kay\u0131t oldu\u011funu belirlemek istiyor.  <code class=\"language-\">students<\/code> tablosunda <code class=\"language-\">registration_date<\/code> (timestamp) s\u00fctunu bulunmaktad\u0131r.  A\u015fa\u011f\u0131daki sorgu, her g\u00fcn kaydolan \u00f6\u011frenci say\u0131s\u0131n\u0131 hesaplar:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    date_trunc('day', registration_date) AS registration_day,\n    COUNT(*) AS daily_registrations\nFROM\n    students\nGROUP BY\n    registration_day\nORDER BY\n    registration_day;<\/code><\/pre>\n<p>## Performans Optimizasyonu \u0130\u00e7in \u0130pu\u00e7lar\u0131<\/p>\n<p>B\u00fcy\u00fck veri setlerinde performans\u0131 optimize etmek i\u00e7in a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131n\u0131 uygulayabilirsiniz:<\/p>\n<p>* **\u0130ndeksler:**  Tarih s\u00fctunlar\u0131 \u00fczerinde indeksler olu\u015fturun.<br \/>\n* **Fonksiyonel \u0130ndeksler:**  <code class=\"language-\">date_trunc()<\/code> fonksiyonunun sonucunu indekslemek i\u00e7in fonksiyonel indeksler kullan\u0131n.<br \/>\n* **Par\u00e7alama:**  B\u00fcy\u00fck tablolar\u0131 daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6l\u00fcn.<br \/>\n* **Sorgu Optimizasyonu:**  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu performans\u0131n\u0131 analiz edin ve gerekti\u011finde sorguyu optimize edin.<\/p>\n<p>## PostgreSQL&#8217;de Tarih Manip\u00fclasyonu \u0130\u00e7in \u0130leri Teknikler<\/p>\n<p>Daha karma\u015f\u0131k tarih manip\u00fclasyonlar\u0131 i\u00e7in, <code class=\"language-\">EXTRACT()<\/code>, <code class=\"language-\">DATE_PART()<\/code>, <code class=\"language-\">AGE()<\/code> gibi fonksiyonlar\u0131 kullanabilirsiniz.  Bu fonksiyonlar, tarih ve zaman de\u011ferlerinden belirli bile\u015fenleri (y\u0131l, ay, g\u00fcn, saat, dakika, saniye) ay\u0131klaman\u0131za veya iki tarih aras\u0131ndaki zaman fark\u0131n\u0131 hesaplaman\u0131za olanak tan\u0131r.  Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL e\u011fitimlerine](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p>## Sonu\u00e7<\/p>\n<p>Bu makalede, PostgreSQL&#8217;de bir tarihin g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 bulman\u0131n farkl\u0131 y\u00f6ntemlerini inceledik.  <code class=\"language-\">date_trunc()<\/code> fonksiyonu, bu i\u015flem i\u00e7in en yayg\u0131n ve etkili y\u00f6ntemdir.  Ancak, <code class=\"language-\">make_date()<\/code> ve <code class=\"language-\">make_timestamp()<\/code> fonksiyonlar\u0131 da kullan\u0131labilir.  Performans optimizasyonu i\u00e7in indeksler ve sorgu optimizasyonu teknikleri \u00f6nemlidir.  Ger\u00e7ek d\u00fcnya \u00f6rnekleri ve ileri teknikler ile PostgreSQL&#8217;de tarih manip\u00fclasyonunu daha iyi anlaman\u0131za yard\u0131mc\u0131 olmay\u0131 ama\u00e7lad\u0131k.<\/p>\n<p>**S\u0131k\u00e7a Sorulan Sorular:**<\/p>\n<p>1. <code class=\"language-\">date_trunc()<\/code> fonksiyonu hangi veri tiplerini destekler?  <code class=\"language-\">timestamp<\/code>, <code class=\"language-\">timestamptz<\/code> ve <code class=\"language-\">date<\/code> tiplerini destekler.<br \/>\n2. B\u00fcy\u00fck veri setlerinde performans\u0131 nas\u0131l optimize edebilirim?  \u0130ndeksler olu\u015fturun, fonksiyonel indeksleri kullan\u0131n, tablolar\u0131 par\u00e7alamay\u0131 d\u00fc\u015f\u00fcn\u00fcn ve sorguyu optimize edin.<br \/>\n3. <code class=\"language-\">NULL<\/code> de\u011ferleri olan tarih s\u00fctunlar\u0131n\u0131 nas\u0131l ele alabilirim?  <code class=\"language-\">COALESCE()<\/code> fonksiyonunu kullan\u0131n.<br \/>\n4. Farkl\u0131 zaman dilimlerini nas\u0131l y\u00f6netebilirim?  <code class=\"language-\">timestamp with time zone<\/code> veri tipini kullan\u0131n.<br \/>\n5. Daha karma\u015f\u0131k tarih hesaplamalar\u0131 i\u00e7in hangi fonksiyonlar\u0131 kullanabilirim?  <code class=\"language-\">EXTRACT()<\/code>, <code class=\"language-\">DATE_PART()<\/code>, <code class=\"language-\">AGE()<\/code> gibi fonksiyonlar\u0131 kullanabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de G\u00fcn\u00fcn Ba\u015flang\u0131c\u0131n\u0131 Nas\u0131l Buluruz? **Meta A\u00e7\u0131klamas\u0131:** PostgreSQL veritaban\u0131n\u0131zda bir tarihin g\u00fcn\u00fcn ba\u015flang\u0131c\u0131n\u0131 (00:00:00) nas\u0131l elde edersiniz?&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-25146","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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