{"id":26842,"date":"2025-08-01T15:15:24","date_gmt":"2025-08-01T12:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-ogelerin-sayisina-gore-siralama-orneklerle\/"},"modified":"2025-08-01T15:15:24","modified_gmt":"2025-08-01T12:15:24","slug":"postgresqlde-ogelerin-sayisina-gore-siralama-orneklerle","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-ogelerin-sayisina-gore-siralama-orneklerle\/","title":{"rendered":"PostgreSQL&#8217;de \u00d6\u011felerin Say\u0131s\u0131na G\u00f6re S\u0131ralama (\u00d6rneklerle)"},"content":{"rendered":"<p># PostgreSQL&#8217;de COUNT ile S\u0131ralama: Ad\u0131m Ad\u0131m K\u0131lavuz<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda s\u0131k\u00e7a kar\u015f\u0131la\u015ft\u0131\u011f\u0131n\u0131z bir sorun var m\u0131?  \u00d6rne\u011fin, hangi \u00fcr\u00fcn\u00fcn en \u00e7ok sat\u0131ld\u0131\u011f\u0131n\u0131, hangi \u015fehirden en fazla sipari\u015f geldi\u011fini veya hangi yazar\u0131n en \u00e7ok kitap yazd\u0131\u011f\u0131n\u0131 h\u0131zl\u0131ca bulmak istiyorsunuz.  \u0130\u015fte bu noktada PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc <code class=\"language-\">COUNT()<\/code> fonksiyonu ve <code class=\"language-\">ORDER BY<\/code> klavuzu devreye giriyor. Bu makalede, PostgreSQL&#8217;de verileri say\u0131m\u0131na g\u00f6re s\u0131ralamay\u0131 ad\u0131m ad\u0131m, yeni ba\u015flayanlardan uzmanlara kadar herkesin anlayabilece\u011fi \u015fekilde ele alaca\u011f\u0131z.  Verimlili\u011fi art\u0131racak optimizasyon tekniklerini ve kar\u015f\u0131la\u015fabilece\u011finiz zorluklar\u0131 da detayl\u0131 olarak inceleyece\u011fiz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, PostgreSQL&#8217;de COUNT ile s\u0131ralama i\u015flemini \u00fc\u00e7 seviyede ele al\u0131yor:<\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> Temel kavramlar, basit \u00f6rnekler ve ad\u0131m ad\u0131m a\u00e7\u0131klamalar.<br \/>\n* <strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, optimizasyon ipu\u00e7lar\u0131 ve performans art\u0131r\u0131c\u0131 teknikler.<br \/>\n* <strong>\u0130leri Seviye:<\/strong> Performans analizi, karma\u015f\u0131k sorgular ve beklenmedik durumlar (edge case&#8217;ler).<\/p>\n<p><strong>PostgreSQL&#8217;de COUNT Fonksiyonu Nedir?<\/strong><\/p>\n<p><code class=\"language-\">COUNT()<\/code> fonksiyonu, bir tablo veya sorgunun sonucunda bulunan sat\u0131r say\u0131s\u0131n\u0131 belirlemek i\u00e7in kullan\u0131l\u0131r.  <code class=\"language-\">COUNT(*)<\/code>, t\u00fcm sat\u0131rlar\u0131 sayarken, <code class=\"language-\">COUNT(column_name)<\/code> belirtilen s\u00fct\u00fcndaki NULL olmayan de\u011ferleri sayar.  Bu fonksiyon, veritaban\u0131n\u0131zda bulunan verilerin istatistiksel analizini yapmak ve veriye dayal\u0131 kararlar almak i\u00e7in olduk\u00e7a \u00f6nemlidir. \u00d6rne\u011fin, bir e-ticaret sitesindeki \u00fcr\u00fcnlerin sat\u0131\u015f say\u0131lar\u0131n\u0131, bir sosyal medya platformundaki kullan\u0131c\u0131lar\u0131n takip\u00e7i say\u0131lar\u0131n\u0131 veya bir blogdaki yaz\u0131lara gelen yorum say\u0131lar\u0131n\u0131 belirlemek i\u00e7in kullan\u0131labilir.  <code class=\"language-\">COUNT()<\/code> fonksiyonu genellikle <code class=\"language-\">GROUP BY<\/code> klavuzu ile birlikte kullan\u0131l\u0131r, b\u00f6ylece gruplar halinde sat\u0131r say\u0131mlar\u0131 elde edilebilir.<\/p>\n<p><strong>PostgreSQL&#8217;de ORDER BY Klavuzu ile S\u0131ralama<\/strong><\/p>\n<p><code class=\"language-\">ORDER BY<\/code> klavuzu, bir sorgu sonucunu belirli bir veya birden fazla s\u00fctuna g\u00f6re s\u0131ralaman\u0131z\u0131 sa\u011flar.  S\u0131ralama <code class=\"language-\">ASC<\/code> (artan) veya <code class=\"language-\">DESC<\/code> (azalan) olarak yap\u0131labilir.  Varsay\u0131lan s\u0131ralama <code class=\"language-\">ASC<\/code>&#8216;dir.  <code class=\"language-\">ORDER BY<\/code> klavuzu, <code class=\"language-\">COUNT()<\/code> fonksiyonu ile birlikte kullan\u0131ld\u0131\u011f\u0131nda, verileri say\u0131mlar\u0131na g\u00f6re s\u0131ralamam\u0131z\u0131 sa\u011flar.  \u00d6rne\u011fin, en \u00e7ok sat\u0131lan \u00fcr\u00fcnleri bulmak i\u00e7in <code class=\"language-\">COUNT()<\/code> ile \u00fcr\u00fcn sat\u0131\u015flar\u0131n\u0131 say\u0131p, <code class=\"language-\">ORDER BY<\/code> ile bu say\u0131mlar\u0131 azalan s\u0131rada s\u0131ralayabiliriz.<\/p>\n<p><strong>PostgreSQL&#8217;de COUNT ile S\u0131ralama: Basit Bir \u00d6rnek (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>Diyelim ki, bir &#8220;\u00fcr\u00fcnler&#8221; tablomuz var ve bu tabloda her \u00fcr\u00fcn\u00fcn ad\u0131 ve sat\u0131lan miktar\u0131 bilgisi bulunuyor.  En \u00e7ok sat\u0131lan \u00fcr\u00fcn\u00fc bulmak i\u00e7in \u015fu sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT product_name, COUNT(*) AS total_sales\nFROM urunler\nGROUP BY product_name\nORDER BY total_sales DESC\nLIMIT 1;<\/code><\/pre>\n<p>Bu sorgu, \u00f6nce <code class=\"language-\">GROUP BY product_name<\/code> ile her \u00fcr\u00fcn i\u00e7in sat\u0131lan miktarlar\u0131 sayar. Sonra <code class=\"language-\">ORDER BY total_sales DESC<\/code> ile bu say\u0131lar\u0131 azalan s\u0131rada s\u0131ralar ve <code class=\"language-\">LIMIT 1<\/code> ile sadece en \u00fcst s\u0131radaki \u00fcr\u00fcn\u00fc (en \u00e7ok sat\u0131lan\u0131) getirir.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>Bir online kitap\u00e7\u0131 d\u00fc\u015f\u00fcn\u00fcn.  Her kitap i\u00e7in sat\u0131\u015f say\u0131s\u0131n\u0131 ve yazar\u0131n\u0131 i\u00e7eren bir tablo var.  Hangi yazar\u0131n en \u00e7ok kitab\u0131 sat\u0131ld\u0131\u011f\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT yazar_adi, COUNT(*) AS toplam_satis\nFROM kitaplar\nGROUP BY yazar_adi\nORDER BY toplam_satis DESC;<\/code><\/pre>\n<p>Bu sorgu, her yazar\u0131n toplam sat\u0131\u015f say\u0131s\u0131n\u0131 hesaplar ve bu say\u0131lara g\u00f6re azalan s\u0131rada s\u0131ralar.  Ancak, milyonlarca kay\u0131d\u0131 olan b\u00fcy\u00fck bir veritaban\u0131nda bu sorgu yava\u015f olabilir.  Performans\u0131 art\u0131rmak i\u00e7in \u015funlar\u0131 yapabiliriz:<\/p>\n<p>* <strong>\u0130ndex Kullan\u0131m\u0131:<\/strong> <code class=\"language-\">yazar_adi<\/code> s\u00fctununa bir indeks eklemek sorgu h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>WHERE Klavuzu:<\/strong>  Belirli bir tarih aral\u0131\u011f\u0131ndaki sat\u0131\u015flar\u0131 sorgulamak i\u00e7in <code class=\"language-\">WHERE<\/code> klavuzu kullanabiliriz. \u00d6rne\u011fin, son bir aydaki en \u00e7ok satan yazar\u0131 bulmak i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT yazar_adi, COUNT(*) AS toplam_satis\n    FROM kitaplar\n    WHERE satis_tarihi &gt;= NOW() - INTERVAL '1 month'\n    GROUP BY yazar_adi\n    ORDER BY toplam_satis DESC;<\/code><\/pre>\n<p>* <strong>Analitik Fonksiyonlar:<\/strong>  Daha karma\u015f\u0131k s\u0131ralama ve say\u0131m i\u015flemleri i\u00e7in pencere fonksiyonlar\u0131 (window functions) kullanabiliriz.  \u00d6rne\u011fin, her yazar\u0131n toplam sat\u0131\u015f say\u0131s\u0131n\u0131 ve genel s\u0131ralamadaki yerini g\u00f6steren bir sorgu:<\/p>\n<pre class=\"language-sql\"><code>SELECT yazar_adi, COUNT(*) AS toplam_satis, RANK() OVER (ORDER BY COUNT(*) DESC) AS sira\n    FROM kitaplar\n    GROUP BY yazar_adi\n    ORDER BY sira;<\/code><\/pre>\n<p><strong>Performans Analizi ve Edge Case&#8217;ler (\u0130leri Seviye)<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck veri setlerinde, <code class=\"language-\">COUNT(*)<\/code> i\u015flemi performans\u0131 etkileyebilir.  Bu durumlarda, <code class=\"language-\">COUNT(1)<\/code> kullanmak daha verimli olabilir \u00e7\u00fcnk\u00fc <code class=\"language-\">COUNT(*)<\/code> t\u00fcm s\u00fctunlar\u0131 kontrol ederken <code class=\"language-\">COUNT(1)<\/code> sadece bir sabit de\u011fer kontrol eder.  Ancak fark genellikle \u00e7ok k\u00fc\u00e7\u00fck olacakt\u0131r.  Daha \u00f6nemli olan, do\u011fru indeksleri kullanmak ve <code class=\"language-\">WHERE<\/code> klavuzunu verimli \u015fekilde kullanmakt\u0131r.<\/p>\n<p><code class=\"language-\">ORDER BY<\/code> klavuzu ile birlikte kullan\u0131lan <code class=\"language-\">LIMIT<\/code> klavuzu, sorgu sonucunu k\u0131s\u0131tlayarak performans\u0131 art\u0131rabilir.  Ancak, <code class=\"language-\">OFFSET<\/code> klavuzu ile birlikte kullan\u0131ld\u0131\u011f\u0131nda performans d\u00fc\u015f\u00fc\u015f\u00fcne neden olabilir.  B\u00fcy\u00fck veri setlerinde, <code class=\"language-\">OFFSET<\/code> yerine ba\u015fka y\u00f6ntemler kullanmak daha verimli olabilir.<\/p>\n<p>Baz\u0131 durumlarda, <code class=\"language-\">NULL<\/code> de\u011ferlerin nas\u0131l ele al\u0131naca\u011f\u0131 \u00f6nemlidir.  <code class=\"language-\">COUNT(column_name)<\/code> NULL de\u011ferleri saymaz.  E\u011fer NULL de\u011ferleri de saymak istiyorsan\u0131z, <code class=\"language-\">COUNT(*)<\/code> kullanmal\u0131s\u0131n\u0131z.<\/p>\n<p><strong>PostgreSQL COUNT ile S\u0131ralama: Karma\u015f\u0131k Bir Senaryo<\/strong><\/p>\n<p>Bir sosyal medya platformunda kullan\u0131c\u0131lar\u0131n g\u00f6nderilerine yap\u0131lan be\u011feni say\u0131s\u0131n\u0131 s\u0131ralayal\u0131m.  Kullan\u0131c\u0131lar\u0131n birden fazla g\u00f6nderisi olabilir.  Her g\u00f6nderinin be\u011feni say\u0131s\u0131 <code class=\"language-\">begeni_sayisi<\/code> s\u00fctununda bulunuyor ve kullan\u0131c\u0131 bilgileri <code class=\"language-\">kullanicilar<\/code> tablosunda bulunuyor.<\/p>\n<pre class=\"language-sql\"><code>SELECT k.kullanici_adi, SUM(g.begeni_sayisi) AS toplam_begeni\nFROM kullanicilar k\nJOIN gonderiler g ON k.kullanici_id = g.kullanici_id\nGROUP BY k.kullanici_adi\nORDER BY toplam_begeni DESC;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">JOIN<\/code> i\u015flemi ile iki tabloyu birle\u015ftirir ve her kullan\u0131c\u0131n\u0131n toplam be\u011feni say\u0131s\u0131n\u0131 hesaplar.  Sonu\u00e7lar, toplam be\u011feni say\u0131s\u0131na g\u00f6re azalan s\u0131rada s\u0131ralan\u0131r.  Bu sorgu, b\u00fcy\u00fck veri setlerinde performans sorunlar\u0131na yol a\u00e7abilir, bu nedenle indeksler ve optimizasyon teknikleri \u00f6nemlidir.  \u00d6rne\u011fin, <code class=\"language-\">kullanici_id<\/code> s\u00fctunlar\u0131na indeks eklenmesi performans\u0131 art\u0131racakt\u0131r.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de <code class=\"language-\">COUNT()<\/code> ve <code class=\"language-\">ORDER BY<\/code> klavuzlar\u0131n\u0131 kullanarak verileri say\u0131mlar\u0131na g\u00f6re s\u0131ralamak, veritaban\u0131n\u0131zdaki verileri analiz etmek ve anlaml\u0131 sonu\u00e7lar \u00e7\u0131karmak i\u00e7in olduk\u00e7a g\u00fc\u00e7l\u00fc bir y\u00f6ntemdir.  Bu makalede, basit \u00f6rneklerden karma\u015f\u0131k senaryolara kadar farkl\u0131 durumlar\u0131 ele ald\u0131k ve performans optimizasyonu i\u00e7in ipu\u00e7lar\u0131 payla\u015ft\u0131k.  Do\u011fru indeksleme ve sorgu optimizasyonu, b\u00fcy\u00fck veri setlerinde bile h\u0131zl\u0131 ve verimli sonu\u00e7lar alman\u0131z\u0131 sa\u011flayacakt\u0131r. Daha fazla PostgreSQL performans optimizasyonu ipucu i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">COUNT(*)<\/code> ve <code class=\"language-\">COUNT(column_name)<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">COUNT(*)<\/code> t\u00fcm sat\u0131rlar\u0131 sayarken, <code class=\"language-\">COUNT(column_name)<\/code> belirtilen s\u00fctundaki NULL olmayan de\u011ferleri sayar.<\/p>\n<p>2. <strong><code class=\"language-\">ORDER BY<\/code> klavuzunda birden fazla s\u00fctun nas\u0131l kullan\u0131l\u0131r?<\/strong>  Birden fazla s\u00fctuna g\u00f6re s\u0131ralamak i\u00e7in virg\u00fclle ay\u0131rarak s\u00fctun adlar\u0131n\u0131 s\u0131ralayabilirsiniz.  \u00d6rne\u011fin, <code class=\"language-\">ORDER BY column1 ASC, column2 DESC<\/code>.<\/p>\n<p>3. <strong><code class=\"language-\">LIMIT<\/code> ve <code class=\"language-\">OFFSET<\/code> klavuzlar\u0131 ne i\u015fe yarar?<\/strong>  <code class=\"language-\">LIMIT<\/code>, sorgu sonucunda d\u00f6nd\u00fcr\u00fclecek sat\u0131r say\u0131s\u0131n\u0131 s\u0131n\u0131rlar. <code class=\"language-\">OFFSET<\/code>, ka\u00e7 sat\u0131r\u0131 atlayarak ba\u015flayaca\u011f\u0131n\u0131z\u0131 belirtir.<\/p>\n<p>4. <strong>PostgreSQL&#8217;de b\u00fcy\u00fck veri setlerinde performans\u0131 nas\u0131l art\u0131rabilirim?<\/strong>  Do\u011fru indeksleri kullanmak, <code class=\"language-\">WHERE<\/code> klavuzunu etkili bir \u015fekilde kullanmak ve gerekti\u011finde pencere fonksiyonlar\u0131 gibi optimizasyon tekniklerini uygulamak performans\u0131 art\u0131r\u0131r.<\/p>\n<p>5. <strong><code class=\"language-\">GROUP BY<\/code> klavuzu olmadan <code class=\"language-\">COUNT()<\/code> fonksiyonu kullan\u0131labilir mi?<\/strong>  Evet, <code class=\"language-\">GROUP BY<\/code> klavuzu olmadan <code class=\"language-\">COUNT()<\/code> fonksiyonu t\u00fcm tablodaki sat\u0131r say\u0131s\u0131n\u0131 verir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de COUNT ile S\u0131ralama: Ad\u0131m Ad\u0131m K\u0131lavuz PostgreSQL veritaban\u0131n\u0131zda s\u0131k\u00e7a kar\u015f\u0131la\u015ft\u0131\u011f\u0131n\u0131z bir sorun var m\u0131? \u00d6rne\u011fin, hangi&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-26842","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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