{"id":27903,"date":"2025-08-20T15:15:20","date_gmt":"2025-08-20T12:15:20","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-tablodan-satir-araligi-nasil-secilir\/"},"modified":"2025-08-20T15:15:20","modified_gmt":"2025-08-20T12:15:20","slug":"postgresql-tablodan-satir-araligi-nasil-secilir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-tablodan-satir-araligi-nasil-secilir\/","title":{"rendered":"PostgreSQL: Tablodan Sat\u0131r Aral\u0131\u011f\u0131 Nas\u0131l Se\u00e7ilir"},"content":{"rendered":"<p># PostgreSQL&#8217;de Sat\u0131r Aral\u0131\u011f\u0131 Se\u00e7imi: Ba\u015ftan U\u00e7ta Bir Rehber<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda milyonlarca sat\u0131r\u0131n\u0131z oldu\u011funu ve bu sat\u0131rlardan sadece belirli bir aral\u0131\u011f\u0131 se\u00e7meniz gerekti\u011fini hayal edin.  Bu i\u015flem, b\u00fcy\u00fck veritabanlar\u0131nda performans a\u00e7\u0131s\u0131ndan kritik \u00f6neme sahiptir.  Yanl\u0131\u015f yakla\u015f\u0131m, sorgu s\u00fcresini katlanarak art\u0131rabilir ve uygulaman\u0131z\u0131n yava\u015flamas\u0131na neden olabilir.  Bu makale, PostgreSQL&#8217;de sat\u0131r aral\u0131\u011f\u0131 se\u00e7imini ad\u0131m ad\u0131m, yeni ba\u015flayanlardan uzmanlara kadar herkes i\u00e7in a\u00e7\u0131klayacak, ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon teknikleri sunacakt\u0131r.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> <code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> kullan\u0131m\u0131, basit kod \u00f6rnekleri.<br \/>\n* <strong>Orta:<\/strong> Ger\u00e7ek hayat senaryolar\u0131, <code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonu, optimizasyon ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri D\u00fczey:<\/strong> Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in stratejiler, <code class=\"language-\">FETCH<\/code> kullan\u0131m\u0131, edge case&#8217;ler.<\/p>\n<p><strong>PostgreSQL&#8217;de Sat\u0131r Aral\u0131\u011f\u0131 Se\u00e7imi Nas\u0131l Yap\u0131l\u0131r? (Temel Kavramlar)<\/strong><\/p>\n<p>PostgreSQL, veritaban\u0131ndan veri \u00e7ekerken sat\u0131rlar\u0131 belirli bir aral\u0131kta se\u00e7mek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler sunar.  En temel y\u00f6ntem, <code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> maddelerini kullanmakt\u0131r.  <code class=\"language-\">LIMIT<\/code>, d\u00f6nd\u00fcr\u00fclecek sat\u0131r say\u0131s\u0131n\u0131 s\u0131n\u0131rlar; <code class=\"language-\">OFFSET<\/code>, at\u0131lacak sat\u0131r say\u0131s\u0131n\u0131 belirtir.<\/p>\n<p>\u00d6rne\u011fin, bir <code class=\"language-\">urunler<\/code> tablosundan 10. sat\u0131rdan ba\u015flayarak 5 sat\u0131r se\u00e7mek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT *\nFROM urunler\nORDER BY urun_id\nLIMIT 5 OFFSET 9;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_id<\/code> s\u00fctununa g\u00f6re s\u0131raland\u0131ktan sonra 10. sat\u0131rdan (0&#8217;dan ba\u015flayan indeksleme nedeniyle <code class=\"language-\">OFFSET 9<\/code>) ba\u015flayarak 5 sat\u0131r d\u00f6nd\u00fcr\u00fcr.  <code class=\"language-\">ORDER BY<\/code> maddesi, sat\u0131rlar\u0131n s\u0131ralanmas\u0131n\u0131 sa\u011flar; aksi takdirde, <code class=\"language-\">OFFSET<\/code> ve <code class=\"language-\">LIMIT<\/code>&#8216;in davran\u0131\u015f\u0131 belirsiz olabilir.<\/p>\n<p><strong>LIMIT ve OFFSET Kullan\u0131m\u0131: Ad\u0131m Ad\u0131m Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p>\u015eimdi, daha detayl\u0131 bir \u00f6rnek \u00fczerinden ilerleyelim.  Bir e-ticaret sitesinin \u00fcr\u00fcnlerini i\u00e7eren bir <code class=\"language-\">urunler<\/code> tablosu oldu\u011funu varsayal\u0131m.  Bu tabloda <code class=\"language-\">urun_id<\/code>, <code class=\"language-\">urun_adi<\/code>, <code class=\"language-\">fiyat<\/code> ve <code class=\"language-\">kategori<\/code> s\u00fctunlar\u0131 bulunmaktad\u0131r.  100. \u00fcr\u00fcnden ba\u015flayarak 20 \u00fcr\u00fcn\u00fcn bilgilerini almak istiyoruz.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_id, urun_adi, fiyat, kategori\nFROM urunler\nORDER BY urun_id\nLIMIT 20 OFFSET 99;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_id<\/code> s\u00fctununa g\u00f6re s\u0131ralanm\u0131\u015f \u00fcr\u00fcnlerden 100. \u00fcr\u00fcnden ba\u015flayarak 20 \u00fcr\u00fcn\u00fcn bilgilerini se\u00e7er.  <code class=\"language-\">OFFSET<\/code> de\u011feri, at\u0131lacak sat\u0131r say\u0131s\u0131n\u0131 g\u00f6sterir, bu nedenle 99 olarak belirtilmi\u015ftir.<\/p>\n<p><strong>Ger\u00e7ek Hayat Senaryolar\u0131: B\u00fcy\u00fck Veri K\u00fcmeleri ve Optimizasyon<\/strong><\/p>\n<p><code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> basit sorgulamalar i\u00e7in uygundur ancak b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans sorunlar\u0131na yol a\u00e7abilir.  PostgreSQL, <code class=\"language-\">OFFSET<\/code> maddesinden \u00f6nceki t\u00fcm sat\u0131rlar\u0131 okumak zorunda kal\u0131r, bu da b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in \u00e7ok zaman alabilir.  Bu sorunu \u00e7\u00f6zmek i\u00e7in daha verimli y\u00f6ntemler kullanmak gerekir.<\/p>\n<p>\u00d6rne\u011fin, bir blog sitesinin yaz\u0131lar\u0131n\u0131 i\u00e7eren bir <code class=\"language-\">yazilar<\/code> tablosu oldu\u011funu ve son 20 yaz\u0131y\u0131 almak istedi\u011fimizi d\u00fc\u015f\u00fcnelim.  <code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> yerine <code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonunu kullanarak daha performansl\u0131 bir sorgu yazabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT yazi_id, baslik, icerik\nFROM (\n    SELECT yazi_id, baslik, icerik, ROW_NUMBER() OVER (ORDER BY yazi_tarihi DESC) as rn\n    FROM yazilar\n) as ranked_yazilar\nWHERE rn BETWEEN 1 AND 20;<\/code><\/pre>\n<p>Bu sorgu, yaz\u0131lar\u0131 <code class=\"language-\">yazi_tarihi<\/code> s\u00fctununa g\u00f6re ters s\u0131ralar ve her yaz\u0131ya bir s\u0131ra numaras\u0131 atar.  Sonras\u0131nda, s\u0131ra numaras\u0131 1 ile 20 aras\u0131nda olan yaz\u0131lar\u0131 se\u00e7er.  Bu y\u00f6ntem, sadece gerekli sat\u0131rlar\u0131 okuyarak performans\u0131 art\u0131r\u0131r.  Daha fazla optimizasyon i\u00e7in indeksler kullanmay\u0131 da unutmay\u0131n.  <code class=\"language-\">yazi_tarihi<\/code> s\u00fctununa bir indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler: FETCH \u0130lk 20, Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>PostgreSQL 8.4 ve sonras\u0131nda <code class=\"language-\">FETCH<\/code> deyimi kullan\u0131labilir.  <code class=\"language-\">FETCH<\/code> deyimi, <code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> ile ayn\u0131 i\u015flevi g\u00f6r\u00fcr ancak daha okunakl\u0131 bir s\u00f6z dizimi sunar.<\/p>\n<pre class=\"language-sql\"><code>SELECT *\nFROM urunler\nORDER BY urun_id\nFETCH FIRST 20 ROWS ONLY;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_id<\/code> s\u00fctununa g\u00f6re s\u0131ralanm\u0131\u015f ilk 20 \u00fcr\u00fcn\u00fc se\u00e7er.  <code class=\"language-\">OFFSET<\/code> ile birlikte kullan\u0131ld\u0131\u011f\u0131nda daha karma\u015f\u0131k aral\u0131klar da se\u00e7ilebilir:<\/p>\n<pre class=\"language-sql\"><code>SELECT *\nFROM urunler\nORDER BY urun_id\nOFFSET 100 ROWS FETCH NEXT 20 ROWS ONLY;<\/code><\/pre>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans analizi \u00e7ok \u00f6nemlidir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 ve s\u00fcresini g\u00f6sterir, b\u00f6ylece performans darbo\u011fazlar\u0131n\u0131 belirleyebilirsiniz.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>EXPLAIN ANALYZE\nSELECT *\nFROM urunler\nORDER BY urun_id\nLIMIT 20 OFFSET 99;<\/code><\/pre>\n<p>Bu komut, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 ve s\u00fcresini g\u00f6stererek optimizasyon i\u00e7in gerekli bilgileri sa\u011flar.  <code class=\"language-\">fatihsoysal.com<\/code> sitesinde bu konuda daha detayl\u0131 bilgi bulabilirsiniz.  Ayr\u0131ca,  veri da\u011f\u0131l\u0131m\u0131 ve indeks kullan\u0131m\u0131 gibi fakt\u00f6rler performans\u0131 etkiler.  Edge case&#8217;ler, \u00f6rne\u011fin bo\u015f bir tabloda sorgu \u00e7al\u0131\u015ft\u0131rma gibi durumlar\u0131 ele almay\u0131 gerektirir.  Bu gibi durumlar\u0131 do\u011fru \u015fekilde ele almak i\u00e7in hata y\u00f6netimi mekanizmalar\u0131 kullanmak \u00f6nemlidir.<\/p>\n<p><strong>PostgreSQL&#8217;de Sat\u0131r Aral\u0131\u011f\u0131 Se\u00e7imi: Sonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular<\/strong><\/p>\n<p>PostgreSQL&#8217;de sat\u0131r aral\u0131\u011f\u0131 se\u00e7imi i\u00e7in farkl\u0131 y\u00f6ntemler mevcuttur.  <code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code>, basit sorgulamalar i\u00e7in uygundur, ancak b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans sorunlar\u0131na yol a\u00e7abilir.  <code class=\"language-\">ROW_NUMBER()<\/code> ve <code class=\"language-\">FETCH<\/code> gibi daha geli\u015fmi\u015f teknikler, performans\u0131 art\u0131rmak i\u00e7in kullan\u0131labilir.  Performans analizi ve uygun indeksleme, b\u00fcy\u00fck veritabanlar\u0131nda verimlili\u011fi sa\u011flamak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code>&#8216;in performans sorunlar\u0131na neden olmas\u0131 nas\u0131l \u00f6nlenebilir?<\/strong>  <code class=\"language-\">ROW_NUMBER()<\/code> fonksiyonu veya uygun indeksler kullanarak.<br \/>\n2. <strong>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in en uygun y\u00f6ntem hangisidir?<\/strong>  <code class=\"language-\">ROW_NUMBER()<\/code> veya <code class=\"language-\">FETCH<\/code> ile birlikte uygun indeksler kullanmak.<br \/>\n3. <strong><code class=\"language-\">OFFSET<\/code> de\u011feri \u00e7ok b\u00fcy\u00fck oldu\u011funda ne olur?<\/strong>  Sorgunun y\u00fcr\u00fct\u00fclmesi \u00e7ok uzun s\u00fcrebilir veya bellek yetersizli\u011fi hatas\u0131 alabilir.<br \/>\n4. <strong>S\u0131ralama \u00f6nemli de\u011filse ne yapmal\u0131y\u0131m?<\/strong>  <code class=\"language-\">ORDER BY<\/code> maddesini kullanmaktan ka\u00e7\u0131nabilirsiniz, ancak sonu\u00e7lar\u0131n s\u0131ras\u0131 belirsiz olacakt\u0131r.<br \/>\n5. <strong>Performans sorunlar\u0131n\u0131 nas\u0131l tespit edebilirim?<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu y\u00fcr\u00fctme plan\u0131n\u0131 inceleyebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Sat\u0131r Aral\u0131\u011f\u0131 Se\u00e7imi: Ba\u015ftan U\u00e7ta Bir Rehber PostgreSQL veritaban\u0131n\u0131zda milyonlarca sat\u0131r\u0131n\u0131z oldu\u011funu ve bu sat\u0131rlardan sadece&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-27903","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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