{"id":25707,"date":"2025-07-12T06:15:24","date_gmt":"2025-07-12T03:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-eksik-tarihleri-doldurma\/"},"modified":"2025-07-12T06:15:24","modified_gmt":"2025-07-12T03:15:24","slug":"postgresql-eksik-tarihleri-doldurma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-eksik-tarihleri-doldurma\/","title":{"rendered":"PostgreSQL: Eksik Tarihleri Doldurma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Eksik Tarihleri Doldurma: Tam Bir Rehber<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda zaman serisi verileriyle \u00e7al\u0131\u015f\u0131yorsan\u0131z, eksik tarihlerle kar\u015f\u0131la\u015fman\u0131z olduk\u00e7a olas\u0131d\u0131r.  \u00d6rne\u011fin, g\u00fcnl\u00fck sat\u0131\u015f verilerinizde baz\u0131 g\u00fcnlerin kayd\u0131 olmayabilir veya sens\u00f6r verilerinizde veri kayb\u0131 ya\u015fanm\u0131\u015f olabilir. Bu eksik veriler, analizlerinizi yanl\u0131\u015f y\u00f6nlendirebilir ve raporlamalar\u0131n\u0131zda hatalara yol a\u00e7abilir. Bu makalede, PostgreSQL&#8217;de eksik tarihleri nas\u0131l dolduraca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar kapsayan kapsaml\u0131 bir rehber sunaca\u011f\u0131z.  Eksik verilerle nas\u0131l ba\u015fa \u00e7\u0131kaca\u011f\u0131n\u0131z\u0131, performans optimizasyonunu ve olas\u0131 sorunlar\u0131 ele alaca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in ad\u0131m ad\u0131m bir yol haritas\u0131 sunmaktad\u0131r:<\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong>  Temel <code class=\"language-\">generate_series<\/code> fonksiyonu ile eksik tarihleri doldurma. Basit bir \u00f6rnek ve a\u00e7\u0131klamalar.<br \/>\n* <strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, <code class=\"language-\">LEFT JOIN<\/code> ve <code class=\"language-\">COALESCE<\/code> fonksiyonlar\u0131n\u0131n kullan\u0131m\u0131, performans optimizasyonu ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri Seviye:<\/strong>  Karma\u015f\u0131k senaryolar, performans analizi, <code class=\"language-\">WINDOW<\/code> fonksiyonlar\u0131, edge case&#8217;ler ve olas\u0131 hatalar\u0131n giderilmesi.<\/p>\n<p><strong>PostgreSQL&#8217;de Eksik Tarihleri Doldurmak \u0130\u00e7in Temel Kavramlar<\/strong><\/p>\n<p>Zaman serisi verileriyle \u00e7al\u0131\u015f\u0131rken eksik verilerle kar\u015f\u0131la\u015fmak yayg\u0131nd\u0131r.  PostgreSQL, bu sorunu \u00e7\u00f6zmek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler sunar.  Temel olarak, eksik tarihleri doldurmak i\u00e7in \u00f6ncelikle t\u00fcm olas\u0131 tarihleri \u00fcretmeniz ve ard\u0131ndan bu tarihleri mevcut verilerinizle birle\u015ftirmeniz gerekir.  Bu i\u015flemde genellikle <code class=\"language-\">generate_series<\/code> fonksiyonu ve <code class=\"language-\">LEFT JOIN<\/code> kullan\u0131l\u0131r. <code class=\"language-\">generate_series<\/code> fonksiyonu, belirtilen bir aral\u0131kta d\u00fczenli aral\u0131klarla de\u011ferler \u00fcretir. <code class=\"language-\">LEFT JOIN<\/code> ise sol taraftaki tablodaki t\u00fcm sat\u0131rlar\u0131 korur ve sa\u011f taraftaki tablodan e\u015fle\u015fen sat\u0131rlar varsa onlar\u0131 birle\u015ftirir, yoksa NULL de\u011ferler \u00fcretir.  <code class=\"language-\">COALESCE<\/code> fonksiyonu ise NULL de\u011ferleri belirledi\u011finiz bir de\u011ferle de\u011fi\u015ftirir.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r? Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>Diyelim ki, g\u00fcnl\u00fck sat\u0131\u015f verilerinizi tutan bir <code class=\"language-\">sales<\/code> tablonuz var:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE sales (\n    sale_date DATE,\n    sales_amount NUMERIC\n);\n\nINSERT INTO sales (sale_date, sales_amount) VALUES\n('2024-01-01', 100),\n('2024-01-03', 150),\n('2024-01-05', 200);<\/code><\/pre>\n<p>G\u00f6r\u00fcld\u00fc\u011f\u00fc gibi, 2024-01-02 ve 2024-01-04 tarihlerinde sat\u0131\u015f verisi eksik.  Bu eksik tarihleri 0 sat\u0131\u015f miktar\u0131yla doldural\u0131m:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    g.date,\n    COALESCE(s.sales_amount, 0) AS sales_amount\nFROM\n    generate_series('2024-01-01'::date, '2024-01-05'::date, '1 day'::interval) AS g(date)\nLEFT JOIN\n    sales s ON g.date = s.sale_date\nORDER BY\n    g.date;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">generate_series<\/code> ile 2024-01-01 ile 2024-01-05 aras\u0131ndaki t\u00fcm tarihleri \u00fcretir.  <code class=\"language-\">LEFT JOIN<\/code> ile <code class=\"language-\">sales<\/code> tablosunu birle\u015ftirir. Eksik tarihler i\u00e7in <code class=\"language-\">sales_amount<\/code> NULL olur, <code class=\"language-\">COALESCE<\/code> fonksiyonu bunu 0 ile de\u011fi\u015ftirir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: E-Ticaret Verileri Analizi<\/strong><\/p>\n<p>Bir e-ticaret \u015firketinde g\u00fcnl\u00fck sipari\u015f say\u0131lar\u0131n\u0131 analiz etmek istedi\u011finizi varsayal\u0131m.  Baz\u0131 g\u00fcnlerde sipari\u015f say\u0131s\u0131 0 olabilir, ancak bu g\u00fcnlerin veritaban\u0131nda kayd\u0131 olmayabilir.  A\u015fa\u011f\u0131daki sorgu, eksik tarihleri 0 sipari\u015f say\u0131s\u0131yla doldurarak tam bir zaman serisi olu\u015fturur:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    g.date,\n    COALESCE(COUNT(o.order_id), 0) AS order_count\nFROM\n    generate_series('2024-01-01'::date, '2024-01-31'::date, '1 day'::interval) AS g(date)\nLEFT JOIN\n    orders o ON g.date = o.order_date\nGROUP BY\n    g.date\nORDER BY\n    g.date;<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code class=\"language-\">orders<\/code> tablosunun <code class=\"language-\">order_date<\/code> s\u00fctunu sipari\u015f tarihlerini tutmaktad\u0131r. <code class=\"language-\">COUNT(o.order_id)<\/code> ile her tarih i\u00e7in sipari\u015f say\u0131s\u0131 hesaplan\u0131r ve eksik tarihler i\u00e7in 0 olarak g\u00f6sterilir.  Bu, daha do\u011fru ve kapsaml\u0131 bir analiz yapman\u0131za olanak tan\u0131r.<\/p>\n<p><strong>Performans Optimizasyonu \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, performans\u0131 optimize etmek \u00f6nemlidir.  \u0130\u015fte baz\u0131 ipu\u00e7lar\u0131:<\/p>\n<p>* <strong>\u0130ndex Kullan\u0131m\u0131:<\/strong> <code class=\"language-\">sale_date<\/code> ve <code class=\"language-\">order_date<\/code> gibi tarih s\u00fctunlar\u0131na index eklemek, sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>Tarih Aral\u0131\u011f\u0131n\u0131 S\u0131n\u0131rlama:<\/strong>  <code class=\"language-\">generate_series<\/code> fonksiyonunda m\u00fcmk\u00fcn oldu\u011funca dar bir tarih aral\u0131\u011f\u0131 belirleyin.<br \/>\n* <strong>Gerekli S\u00fctunlar\u0131 Se\u00e7in:<\/strong>  Sadece gerekli s\u00fctunlar\u0131 se\u00e7in, gereksiz s\u00fctunlar\u0131 se\u00e7mek sorgu s\u00fcresini uzatabilir.<br \/>\n* <strong>Materialized View&#8217;ler:<\/strong>  S\u0131k\u00e7a kullan\u0131lan sorgulamalar i\u00e7in materialized view olu\u015fturarak performans\u0131 iyile\u015ftirebilirsiniz.  [Fatih Soysal&#8217;\u0131n blogunda](https:\/\/fatihsoysal.com) materialized view&#8217;ler hakk\u0131nda daha fazla bilgi bulabilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler: WINDOW Fonksiyonlar\u0131 ve Karma\u015f\u0131k Senaryolar<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolarda, \u00f6rne\u011fin eksik verileri \u00f6nceki veya sonraki g\u00fcnlerin verileriyle doldurmak isteyebilirsiniz.  Bu durumda <code class=\"language-\">LAG<\/code> ve <code class=\"language-\">LEAD<\/code> gibi WINDOW fonksiyonlar\u0131n\u0131 kullanabilirsiniz.  \u00d6rne\u011fin, eksik sat\u0131\u015f verilerini \u00f6nceki g\u00fcn\u00fcn verileriyle doldurmak i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>WITH daily_sales AS (\n    SELECT\n        g.date,\n        COALESCE(s.sales_amount, 0) AS sales_amount\n    FROM\n        generate_series('2024-01-01'::date, '2024-01-05'::date, '1 day'::interval) AS g(date)\n    LEFT JOIN\n        sales s ON g.date = s.sale_date\n)\nSELECT\n    date,\n    COALESCE(sales_amount, LAG(sales_amount, 1, 0) OVER (ORDER BY date)) AS filled_sales_amount\nFROM daily_sales;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">LAG<\/code> fonksiyonunu kullanarak eksik <code class=\"language-\">sales_amount<\/code> de\u011ferlerini \u00f6nceki g\u00fcn\u00fcn de\u011ferleriyle doldurur.  <code class=\"language-\">LAG(sales_amount, 1, 0)<\/code>  bir \u00f6nceki sat\u0131rdaki <code class=\"language-\">sales_amount<\/code> de\u011ferini al\u0131r, e\u011fer yoksa 0 de\u011ferini kullan\u0131r.<\/p>\n<p><strong>Edge Case&#8217;ler ve Hatalar\u0131n Giderilmesi<\/strong><\/p>\n<p>* <strong>\u00c7ok b\u00fcy\u00fck tarih aral\u0131klar\u0131:<\/strong> \u00c7ok geni\u015f tarih aral\u0131klar\u0131 i\u00e7in <code class=\"language-\">generate_series<\/code> performans sorunlar\u0131na yol a\u00e7abilir. Bu durumda, tarih aral\u0131\u011f\u0131n\u0131 daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lmek veya alternatif y\u00f6ntemler kullanmak gerekebilir.<br \/>\n* <strong>Veri tipi uyumsuzlu\u011fu:<\/strong> <code class=\"language-\">generate_series<\/code> ve <code class=\"language-\">JOIN<\/code> i\u015flemlerinde veri tiplerinin uyumlu oldu\u011fundan emin olun.<br \/>\n* <strong>NULL de\u011ferlerin i\u015flenmesi:<\/strong>  <code class=\"language-\">COALESCE<\/code> veya benzer fonksiyonlar kullanarak NULL de\u011ferleri nas\u0131l i\u015fleyece\u011finizi dikkatlice belirleyin.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de eksik tarihleri doldurmak, zaman serisi verileriyle \u00e7al\u0131\u015f\u0131rken verimli ve do\u011fru analizler yapmak i\u00e7in \u00f6nemlidir.  Bu rehberde, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in \u00e7e\u015fitli y\u00f6ntemler ve ipu\u00e7lar\u0131 sunuldu.  Uygun y\u00f6ntemi se\u00e7erken veri b\u00fcy\u00fckl\u00fc\u011f\u00fc, performans gereksinimleri ve veri yap\u0131s\u0131 gibi fakt\u00f6rleri g\u00f6z \u00f6n\u00fcnde bulundurmak \u00f6nemlidir.  Unutmay\u0131n, do\u011fru yakla\u015f\u0131m verilerinizin \u00f6zelliklerine ve analiz hedeflerinize ba\u011fl\u0131d\u0131r. Daha fazla PostgreSQL ipucu ve teknikleri i\u00e7in [Fatih Soysal&#8217;\u0131n blogunu](https:\/\/fatihsoysal.com) ziyaret etmeyi unutmay\u0131n.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">generate_series<\/code> fonksiyonu ne kadar b\u00fcy\u00fck tarih aral\u0131klar\u0131 i\u00e7in kullan\u0131labilir?<\/strong>  Performans sorunlar\u0131 ya\u015famamak i\u00e7in b\u00fcy\u00fck tarih aral\u0131klar\u0131n\u0131 daha k\u00fc\u00e7\u00fck par\u00e7alara ay\u0131rmak \u00f6nerilir.<br \/>\n2. <strong>Eksik verileri tahmin etmek m\u00fcmk\u00fcn m\u00fc?<\/strong> Evet, ileri seviye teknikler kullanarak (\u00f6rne\u011fin, zaman serisi analizi modelleri) eksik verileri tahmin edebilirsiniz.<br \/>\n3. <strong>Eksik verilerin doldu\u011funu nas\u0131l do\u011frulayabilirim?<\/strong>  Dolmu\u015f verileri g\u00f6rselle\u015ftirerek veya eksik verilerin say\u0131s\u0131n\u0131 kontrol ederek do\u011frulayabilirsiniz.<br \/>\n4. <strong>Farkl\u0131 aral\u0131klarla (\u00f6rne\u011fin, haftal\u0131k, ayl\u0131k) eksik tarihleri nas\u0131l doldurabilirim?<\/strong> <code class=\"language-\">generate_series<\/code> fonksiyonunun \u00fc\u00e7\u00fcnc\u00fc parametresini (aral\u0131k) de\u011fi\u015ftirerek bunu yapabilirsiniz.<br \/>\n5. <strong>\u00c7ok say\u0131da tabloyla \u00e7al\u0131\u015f\u0131rken performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  Index kullan\u0131m\u0131, uygun JOIN t\u00fcrleri ve gerekli s\u00fctunlar\u0131n se\u00e7imi performans\u0131 art\u0131rabilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Eksik Tarihleri Doldurma: Tam Bir Rehber PostgreSQL veritaban\u0131n\u0131zda zaman serisi verileriyle \u00e7al\u0131\u015f\u0131yorsan\u0131z, eksik tarihlerle kar\u015f\u0131la\u015fman\u0131z olduk\u00e7a&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-25707","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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