{"id":26788,"date":"2025-07-31T18:15:24","date_gmt":"2025-07-31T15:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-zaman-damgasindan-milisaniyeleri-kaldirma\/"},"modified":"2025-07-31T18:15:24","modified_gmt":"2025-07-31T15:15:24","slug":"postgresql-zaman-damgasindan-milisaniyeleri-kaldirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-zaman-damgasindan-milisaniyeleri-kaldirma\/","title":{"rendered":"PostgreSQL: Zaman Damgas\u0131ndan Milisaniyeleri Kald\u0131rma"},"content":{"rendered":"<p># PostgreSQL&#8217;den Milisaniyeleri Silmek: Tam Bir K\u0131lavuz<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda zaman damgalar\u0131n\u0131 (timestamp) kullan\u0131yorsan\u0131z, bazen milisaniyeleri kald\u0131rma ihtiyac\u0131 duyabilirsiniz.  \u00d6rne\u011fin, raporlama amac\u0131yla daha temiz bir g\u00f6r\u00fcn\u00fcm elde etmek veya di\u011fer sistemlerle uyumlulu\u011fu sa\u011flamak i\u00e7in bu i\u015flemi ger\u00e7ekle\u015ftirmeniz gerekebilir. Bu makale, PostgreSQL&#8217;de milisaniyeleri zaman damgalar\u0131ndan nas\u0131l kald\u0131raca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in a\u00e7\u0131klayacakt\u0131r.  Farkl\u0131 y\u00f6ntemleri, performans optimizasyonlar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ele alaca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu k\u0131lavuz, PostgreSQL&#8217;de milisaniye silme i\u015flemini \u00f6\u011frenmenizi \u00fc\u00e7 a\u015famada ele al\u0131r:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel fonksiyonlar ve basit \u00f6rneklerle milisaniye silmeyi \u00f6\u011frenin.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve performans optimizasyon ipu\u00e7lar\u0131yla daha geli\u015fmi\u015f teknikleri ke\u015ffedin.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Performans analizi, karma\u015f\u0131k durumlar ve potansiyel sorunlar\u0131 inceleyin.<\/p>\n<p><strong>PostgreSQL Zaman Damgalar\u0131: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, zaman\u0131 temsil etmek i\u00e7in \u00e7e\u015fitli veri tipleri sunar. Bunlardan en yayg\u0131n kullan\u0131lan\u0131 <code class=\"language-\">timestamp without time zone<\/code> ve <code class=\"language-\">timestamp with time zone<\/code>&#8216;dur.  <code class=\"language-\">timestamp without time zone<\/code> lokal zaman\u0131 temsil ederken, <code class=\"language-\">timestamp with time zone<\/code> UTC zaman\u0131n\u0131 ve zaman dilimi bilgisini saklar.  Her iki tip de milisaniye hassasiyetine sahiptir. Bu makalede, her iki tip i\u00e7in de ge\u00e7erli y\u00f6ntemleri ele alaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL&#8217;de Milisaniyeleri Kald\u0131rman\u0131n Basit Y\u00f6ntemi: <code class=\"language-\">date_trunc()<\/code> Fonksiyonu<\/strong><\/p>\n<p>PostgreSQL&#8217;in <code class=\"language-\">date_trunc()<\/code> fonksiyonu, zaman damgalar\u0131n\u0131 belirli bir zaman birimine yuvarlamaya yarar. Milisaniyeleri kald\u0131rmak i\u00e7in, bu fonksiyonu saniye birimiyle birlikte kullanabiliriz.<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki SQL sorgusu, <code class=\"language-\">timestamp<\/code> s\u00fctunundaki milisaniyeleri saniyeye yuvarlayarak siler:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('second', timestamp_column) FROM your_table;<\/code><\/pre>\n<p><code class=\"language-\">your_table<\/code> tablonuzun ad\u0131n\u0131 ve <code class=\"language-\">timestamp_column<\/code> s\u00fctununuzun ad\u0131n\u0131 de\u011fi\u015ftirmeyi unutmay\u0131n.  \u00d6rne\u011fin, <code class=\"language-\">orders<\/code> adl\u0131 bir tablomuz ve <code class=\"language-\">order_date<\/code> adl\u0131 bir zaman damgas\u0131 s\u00fctunumuz varsa sorgu \u015fu \u015fekilde olur:<\/p>\n<pre class=\"language-sql\"><code>SELECT date_trunc('second', order_date) FROM orders;<\/code><\/pre>\n<p>Bu sorgu, her sat\u0131rdaki <code class=\"language-\">order_date<\/code> s\u00fctunundaki milisaniyeleri silerek saniyeye yuvarlanm\u0131\u015f bir zaman damgas\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p>Ger\u00e7ek bir senaryo olarak, bir e-ticaret sitesinin sipari\u015f tarihlerini raporlarken milisaniyeleri g\u00f6rmezden gelmek istedi\u011fimizi d\u00fc\u015f\u00fcnelim.  <code class=\"language-\">orders<\/code> tablosunda <code class=\"language-\">order_date<\/code> s\u00fctunu bulunmaktad\u0131r.  Bu s\u00fctunun milisaniyelerden ar\u0131nd\u0131r\u0131lm\u0131\u015f versiyonunu yeni bir s\u00fctun olarak eklemek i\u00e7in a\u015fa\u011f\u0131daki sorgular\u0131 kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>ALTER TABLE orders ADD COLUMN order_date_truncated timestamp without time zone;\n\nUPDATE orders SET order_date_truncated = date_trunc('second', order_date);<\/code><\/pre>\n<p>\u0130lk sorgu, <code class=\"language-\">order_date_truncated<\/code> ad\u0131nda yeni bir s\u00fctun ekler. \u0130kinci sorgu ise, mevcut <code class=\"language-\">order_date<\/code> s\u00fctunundan milisaniyeleri silerek yeni s\u00fctuna de\u011ferleri atar.  Bu yakla\u015f\u0131m, orijinal verileri korurken, raporlama i\u00e7in temizlenmi\u015f verileri de sa\u011flar.<\/p>\n<p><strong>Daha Geli\u015fmi\u015f Teknikler:  <code class=\"language-\">to_char()<\/code> Fonksiyonu ile Bi\u00e7imlendirme<\/strong><\/p>\n<p><code class=\"language-\">date_trunc()<\/code> fonksiyonu milisaniyeleri silerken, zaman damgas\u0131n\u0131 saniyeye yuvarlar. E\u011fer tam olarak milisaniyelerden ar\u0131nd\u0131r\u0131lm\u0131\u015f bir string temsiline ihtiyac\u0131n\u0131z varsa, <code class=\"language-\">to_char()<\/code> fonksiyonunu kullanabilirsiniz.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p><code class=\"language-\">to_char()<\/code> fonksiyonu, zaman damgas\u0131n\u0131 belirli bir formatta string olarak d\u00f6nd\u00fcr\u00fcr. Milisaniyeleri g\u00f6stermeyen bir format belirleyerek, milisaniyeleri etkili bir \u015fekilde kald\u0131rabiliriz.<\/p>\n<pre class=\"language-sql\"><code>SELECT to_char(timestamp_column, 'YYYY-MM-DD HH24:MI:SS') FROM your_table;<\/code><\/pre>\n<p>Bu sorgu, zaman damgas\u0131n\u0131 <code class=\"language-\">YYYY-MM-DD HH24:MI:SS<\/code> format\u0131nda bir string olarak d\u00f6nd\u00fcr\u00fcr, milisaniyeler dahil de\u011fildir.  Bu y\u00f6ntem, veriyi raporlama veya d\u0131\u015f sistemlere aktarma gibi durumlarda kullan\u0131\u015fl\u0131 olabilir.  Ancak, bu string de\u011ferleri tekrar zaman damgas\u0131 olarak kullanmak isterseniz, <code class=\"language-\">to_timestamp()<\/code> fonksiyonunu kullanman\u0131z gerekecektir.<\/p>\n<p><strong>Performans Optimizasyonu ve \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p><strong>\u0130leri Seviye:<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">date_trunc()<\/code> veya <code class=\"language-\">to_char()<\/code> fonksiyonlar\u0131n\u0131n performans\u0131 \u00f6nemli olabilir.  \u0130ndeks kullan\u0131m\u0131 performans\u0131 art\u0131rabilir.  E\u011fer bu fonksiyonlar\u0131 s\u0131kl\u0131kla kullan\u0131yorsan\u0131z, indekslemeyi d\u00fc\u015f\u00fcn\u00fcn.  Ancak, fonksiyonel indeksler olu\u015fturmak, indeks boyutunu art\u0131rabilir ve disk kullan\u0131m\u0131n\u0131 art\u0131rabilir.  Bu nedenle, indeks olu\u015fturmadan \u00f6nce dikkatlice performans testleri yapmal\u0131s\u0131n\u0131z.<\/p>\n<p>Ayr\u0131ca,  <code class=\"language-\">date_trunc()<\/code> ve <code class=\"language-\">to_char()<\/code> fonksiyonlar\u0131n\u0131 <code class=\"language-\">WHERE<\/code> c\u00fcmlesinde kullan\u0131rken performans d\u00fc\u015f\u00fc\u015f\u00fc ya\u015fayabilirsiniz.  Bu gibi durumlarda,  gerekiyorsa, \u00f6nceden hesaplanm\u0131\u015f de\u011ferleri saklayarak performans\u0131 iyile\u015ftirebilirsiniz.  \u00d6rne\u011fin,  <code class=\"language-\">order_date_truncated<\/code> s\u00fctununu \u00f6nceden hesaplayarak,  sorgu performans\u0131n\u0131 art\u0131rabilirsiniz.<\/p>\n<p><strong>Karma\u015f\u0131k Durumlar ve  Edge Case&#8217;ler<\/strong><\/p>\n<p><strong>\u0130leri Seviye:<\/strong><\/p>\n<p>Zaman dilimi ayarlar\u0131n\u0131z\u0131n sorgular\u0131n\u0131z\u0131n sonu\u00e7lar\u0131n\u0131 nas\u0131l etkiledi\u011fini anlamak \u00f6nemlidir. <code class=\"language-\">timestamp with time zone<\/code> kullan\u0131yorsan\u0131z, milisaniyeleri kald\u0131rd\u0131ktan sonra zaman dilimi bilgilerini korudu\u011funuzdan emin olun.  Aktif zaman dilimi ayarlar\u0131n\u0131z\u0131n sorgular\u0131n\u0131z\u0131n sonu\u00e7lar\u0131n\u0131 etkileyebilece\u011fini unutmay\u0131n.<\/p>\n<p>Ayr\u0131ca, farkl\u0131 zaman dilimlerinden gelen zaman damgalar\u0131n\u0131 birle\u015ftirdi\u011finizde, milisaniye silme i\u015fleminin sonu\u00e7lar\u0131n\u0131 dikkatlice de\u011ferlendirin.  Zaman dilimi d\u00f6n\u00fc\u015f\u00fcmlerinin milisaniyeleri nas\u0131l etkileyebilece\u011fini anlamak \u00f6nemlidir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131<\/strong><\/p>\n<p>Bir e-ticaret sitesinin g\u00fcnl\u00fck sat\u0131\u015f raporlar\u0131n\u0131 olu\u015fturmas\u0131 gerekti\u011fini d\u00fc\u015f\u00fcn\u00fcn. Milisaniyeler raporlamada gerekli de\u011fildir ve hatta raporun okunabilirli\u011fini azaltabilir.  <code class=\"language-\">date_trunc()<\/code> fonksiyonu kullanarak milisaniyeleri kald\u0131rarak daha temiz ve okunabilir bir rapor olu\u015fturabilirsiniz.<\/p>\n<p>Bir ba\u015fka \u00f6rnek olarak, bir lojistik \u015firketinin teslimat s\u00fcrelerini analiz etti\u011fini d\u00fc\u015f\u00fcnelim.  Teslimat zamanlar\u0131n\u0131 saniye hassasiyetinde kaydeden bir sistemleri oldu\u011funu varsayal\u0131m.  Milisaniyelerin analize etkisi ihmal edilebilir d\u00fczeyde olabilir.  Bu durumda, <code class=\"language-\">date_trunc()<\/code> kullanarak milisaniyeleri kald\u0131rarak verileri basitle\u015ftirebilir ve analizi h\u0131zland\u0131rabilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de milisaniyeleri zaman damgalar\u0131ndan kald\u0131rman\u0131n birka\u00e7 yolu vard\u0131r.  <code class=\"language-\">date_trunc()<\/code> ve <code class=\"language-\">to_char()<\/code> fonksiyonlar\u0131 en yayg\u0131n kullan\u0131lan y\u00f6ntemlerdir.  Ancak, performans ve do\u011fruluk i\u00e7in do\u011fru fonksiyonu se\u00e7mek ve olas\u0131 sorunlar\u0131 \u00f6nlemek i\u00e7in dikkatli olmak \u00f6nemlidir.  Bu makalede ele al\u0131nan y\u00f6ntemler ve ipu\u00e7lar\u0131, PostgreSQL&#8217;de zaman damgas\u0131 verileriyle daha etkin bir \u015fekilde \u00e7al\u0131\u015fman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">date_trunc()<\/code> fonksiyonu milisaniyeleri nas\u0131l yuvarlar?<\/strong>  <code class=\"language-\">date_trunc()<\/code> fonksiyonu milisaniyeleri a\u015fa\u011f\u0131 yuvarlar (0&#8217;a do\u011fru).<\/p>\n<p>2. <strong>Milisaniyeleri kald\u0131rd\u0131ktan sonra zaman damgas\u0131n\u0131 tekrar kullanabilir miyim?<\/strong>  <code class=\"language-\">date_trunc()<\/code> fonksiyonu ile elde edilen sonu\u00e7 yine bir zaman damgas\u0131d\u0131r ve do\u011frudan kullanabilirsiniz.  <code class=\"language-\">to_char()<\/code> ile string olarak elde ettiyseniz, <code class=\"language-\">to_timestamp()<\/code> fonksiyonu ile tekrar zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrmeniz gerekir.<\/p>\n<p>3. <strong>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans nas\u0131l iyile\u015ftirilebilir?<\/strong>  \u0130ndeksleme ve \u00f6nceden hesaplanm\u0131\u015f s\u00fctunlar kullanarak performans\u0131 iyile\u015ftirebilirsiniz.<\/p>\n<p>4. <strong>Farkl\u0131 zaman dilimlerinden gelen zaman damgalar\u0131yla nas\u0131l \u00e7al\u0131\u015f\u0131r\u0131m?<\/strong>  Zaman dilimi ayarlar\u0131n\u0131z\u0131 do\u011fru \u015fekilde yap\u0131land\u0131r\u0131n ve zaman dilimi d\u00f6n\u00fc\u015f\u00fcmlerinin milisaniyeleri nas\u0131l etkileyebilece\u011fini anlay\u0131n.<\/p>\n<p>5. <strong>Hangi fonksiyonu kullanmal\u0131y\u0131m: <code class=\"language-\">date_trunc()<\/code> mu yoksa <code class=\"language-\">to_char()<\/code> m\u0131?<\/strong>  E\u011fer zaman damgas\u0131 olarak tutmaya devam edecekseniz <code class=\"language-\">date_trunc()<\/code> kullan\u0131n. E\u011fer string olarak saklayacaksan\u0131z veya d\u0131\u015f bir sisteme aktaracaksan\u0131z <code class=\"language-\">to_char()<\/code> kullan\u0131n.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;den Milisaniyeleri Silmek: Tam Bir K\u0131lavuz PostgreSQL veritaban\u0131n\u0131zda zaman damgalar\u0131n\u0131 (timestamp) kullan\u0131yorsan\u0131z, bazen milisaniyeleri kald\u0131rma ihtiyac\u0131 duyabilirsiniz.&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-26788","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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