{"id":26850,"date":"2025-08-01T18:15:23","date_gmt":"2025-08-01T15:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-null-degerleri-sonda-siralayarak-order-by-kullanimi\/"},"modified":"2025-08-01T18:15:23","modified_gmt":"2025-08-01T15:15:23","slug":"postgresql-null-degerleri-sonda-siralayarak-order-by-kullanimi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-null-degerleri-sonda-siralayarak-order-by-kullanimi\/","title":{"rendered":"PostgreSQL: NULL De\u011ferleri Sonda S\u0131ralayarak ORDER BY Kullan\u0131m\u0131"},"content":{"rendered":"<p># PostgreSQL&#8217;de NULL De\u011ferlerini Sona Alma: ORDER BY Kullan\u0131m\u0131<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda s\u0131ralamalar yaparken NULL de\u011ferlerinin nas\u0131l ele al\u0131naca\u011f\u0131n\u0131 merak ediyor musunuz?  NULL de\u011ferler, veritaban\u0131n\u0131zda eksik veya bilinmeyen verileri temsil eder ve varsay\u0131lan s\u0131ralama davran\u0131\u015flar\u0131 bazen beklenmedik sonu\u00e7lara yol a\u00e7abilir. Bu makalede, PostgreSQL&#8217;de <code class=\"language-\">ORDER BY<\/code> kullanarak NULL de\u011ferlerini listenin sonuna nas\u0131l yerle\u015ftirebilece\u011finizi ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve performans optimizasyon teknikleriyle a\u00e7\u0131klayaca\u011f\u0131z.  Veritaban\u0131 sorgulamalar\u0131n\u0131z\u0131n daha verimli ve anla\u015f\u0131l\u0131r olmas\u0131n\u0131 sa\u011flayacak bu rehber, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in faydal\u0131 olacakt\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de NULL De\u011ferlerini Anlamak<\/strong><\/p>\n<p>Veritaban\u0131 i\u015flemlerinde NULL, bir de\u011ferin olmad\u0131\u011f\u0131n\u0131 veya bilinmedi\u011fini g\u00f6steren \u00f6zel bir de\u011ferdir.  <code class=\"language-\">ORDER BY<\/code> c\u00fcmleci\u011finde, NULL de\u011ferler varsay\u0131lan olarak en ba\u015fta ya da en sonda de\u011fil, veritaban\u0131 sisteminin belirledi\u011fi bir yerde s\u0131ralan\u0131r. Bu da beklenmedik sonu\u00e7lara yol a\u00e7abilir, \u00f6zellikle de s\u0131ralaman\u0131n mant\u0131ksal bir s\u0131ray\u0131 takip etmesini bekledi\u011finiz durumlarda.  \u00d6rne\u011fin, bir m\u00fc\u015fteri listesini alfabetik olarak s\u0131ralamak istedi\u011finizde, NULL isim de\u011ferlerine sahip kay\u0131tlar\u0131n s\u0131ralaman\u0131n neresinde yer alaca\u011f\u0131 belirsizdir. Bu belirsizli\u011fi ortadan kald\u0131rmak ve daha tutarl\u0131 sonu\u00e7lar elde etmek i\u00e7in <code class=\"language-\">ORDER BY<\/code> c\u00fcmleci\u011finde \u00f6zel teknikler kullanmam\u0131z gerekir.<\/p>\n<p><strong>PostgreSQL&#8217;de NULL De\u011ferlerini Sona Alma: Temel Teknikler<\/strong><\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong><\/p>\n<p><strong>Ad\u0131m 1:<\/strong> Basit bir tablo olu\u015ftural\u0131m ve i\u00e7ine baz\u0131 veriler ekleyelim.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE urunler (\n    urun_adi TEXT,\n    fiyat NUMERIC\n);\n\nINSERT INTO urunler (urun_adi, fiyat) VALUES\n('Masa', 500),\n('Sandalye', 150),\n(NULL, 200),\n('Dolap', 800),\n('Lamba', 75),\n(NULL, 300);<\/code><\/pre>\n<p><strong>Ad\u0131m 2:<\/strong>  <code class=\"language-\">ORDER BY<\/code> c\u00fcmlesini kullanarak <code class=\"language-\">urun_adi<\/code> s\u00fctununa g\u00f6re s\u0131ralayal\u0131m. NULL de\u011ferlerinin s\u0131ralaman\u0131n ba\u015f\u0131nda oldu\u011funu g\u00f6receksiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat FROM urunler ORDER BY urun_adi;<\/code><\/pre>\n<p><strong>Ad\u0131m 3:<\/strong> NULL de\u011ferlerini sona almak i\u00e7in <code class=\"language-\">CASE<\/code> ifadesini kullan\u0131n.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat FROM urunler ORDER BY CASE WHEN urun_adi IS NULL THEN 1 ELSE 0 END, urun_adi;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urun_adi<\/code> NULL ise 1, de\u011filse 0 d\u00f6nd\u00fcrerek NULL de\u011ferlerini s\u0131ralamada sona koyar.<\/p>\n<p><strong>Orta Seviye:<\/strong><\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi:<\/strong> Bir e-ticaret sitesindeki \u00fcr\u00fcnlerin fiyat\u0131na g\u00f6re s\u0131ralanmas\u0131. Fiyat\u0131 girilmemi\u015f (NULL) \u00fcr\u00fcnlerin listenin sonunda g\u00f6r\u00fcnmesi isteniyor.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat FROM urunler ORDER BY CASE WHEN fiyat IS NULL THEN 1 ELSE 0 END, fiyat;<\/code><\/pre>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong>  Karma\u015f\u0131k sorgularda,  <code class=\"language-\">CASE<\/code> ifadesinin performans\u0131n\u0131 etkileyebilece\u011fini unutmay\u0131n. B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in indeksleme kullanmak performans\u0131 art\u0131rabilir.  <code class=\"language-\">fiyat<\/code> s\u00fctununa bir indeks eklemek bu sorguyu h\u0131zland\u0131rabilir.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong><\/p>\n<p><strong>Performans Analizi:<\/strong>  \u00c7ok b\u00fcy\u00fck tablolar \u00fczerinde <code class=\"language-\">CASE<\/code> kullan\u0131m\u0131 performans sorunlar\u0131na yol a\u00e7abilir.  Bu durumda, <code class=\"language-\">NULLS LAST<\/code>  kullan\u0131m\u0131 daha verimli olabilir (PostgreSQL 14 ve \u00fczeri s\u00fcr\u00fcmlerinde).<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat FROM urunler ORDER BY urun_adi NULLS LAST;<\/code><\/pre>\n<p><strong>Edge Caseler:<\/strong> Birden fazla s\u00fctuna g\u00f6re s\u0131ralama yaparken <code class=\"language-\">NULLS LAST<\/code>  her s\u00fctun i\u00e7in ayr\u0131 ayr\u0131 uygulanmal\u0131d\u0131r.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat FROM urunler ORDER BY urun_adi NULLS LAST, fiyat NULLS LAST;<\/code><\/pre>\n<p><strong>Performans Optimizasyonu:<\/strong>  \u0130ndeksleme, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in kritik \u00f6neme sahiptir.  S\u0131ralama yap\u0131lacak s\u00fctunlara uygun indeksler eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresinden PostgreSQL performans optimizasyonu hakk\u0131nda daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>NULL De\u011ferlerini Sona Alma: Geli\u015fmi\u015f Teknikler ve Vaka Analizleri<\/strong><\/p>\n<p>Birden fazla s\u00fctuna g\u00f6re s\u0131ralama yaparken NULL de\u011ferlerini nas\u0131l y\u00f6netece\u011finizi ele alal\u0131m. \u00d6rne\u011fin, bir m\u00fc\u015fteri tablosunda hem isim hem de soyad\u0131 s\u00fctunlar\u0131na g\u00f6re s\u0131ralama yapmak istedi\u011finizi d\u00fc\u015f\u00fcn\u00fcn.  Baz\u0131 m\u00fc\u015fterilerde isim veya soyad\u0131 eksik olabilir (NULL).  Bu durumda, \u00f6nce isim s\u00fctununa g\u00f6re, sonra soyad\u0131 s\u00fctununa g\u00f6re s\u0131ralama yaparak ve her iki s\u00fctun i\u00e7in de <code class=\"language-\">NULLS LAST<\/code> kullanarak NULL de\u011ferlerini sona alabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT isim, soyad, email FROM musteriler ORDER BY isim NULLS LAST, soyad NULLS LAST;<\/code><\/pre>\n<p>Bir di\u011fer senaryo ise, bir \u00fcr\u00fcn tablosunda \u00f6nce kategoriye, sonra fiyata g\u00f6re s\u0131ralama yapmakt\u0131r.  Baz\u0131 \u00fcr\u00fcnlerin kategorisi veya fiyat\u0131 eksik olabilir.  Bu durumda da benzer bir yakla\u015f\u0131m kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, kategori, fiyat FROM urunler ORDER BY kategori NULLS LAST, fiyat NULLS LAST;<\/code><\/pre>\n<p>Bu \u00f6rnekler, <code class=\"language-\">NULLS LAST<\/code> kullanarak karma\u015f\u0131k s\u0131ralama senaryolar\u0131nda bile NULL de\u011ferlerini kolayca y\u00f6netebilece\u011finizi g\u00f6stermektedir.<\/p>\n<p><strong>PostgreSQL&#8217;de NULL De\u011ferleri ile \u0130lgili Performans Optimizasyonu<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">ORDER BY<\/code> c\u00fcmlelerinde NULL de\u011ferlerinin i\u015flenmesi performans\u0131 etkileyebilir.  Performans\u0131 optimize etmek i\u00e7in a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131n\u0131 kullanabilirsiniz:<\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong> S\u0131ralama yap\u0131lan s\u00fctunlara uygun indeksler olu\u015fturmak, sorgu s\u00fcresini \u00f6nemli \u00f6l\u00e7\u00fcde azaltabilir.  \u00d6zellikle b\u00fcy\u00fck tablolar i\u00e7in indeksleme olmazsa olmazd\u0131r.<br \/>\n* <strong>WHERE c\u00fcmleci\u011fi:<\/strong>  S\u0131ralama yapmadan \u00f6nce <code class=\"language-\">WHERE<\/code> c\u00fcmleci\u011fi kullanarak veri k\u00fcmesini filtreleyerek, s\u0131ralama i\u015fleminin daha az veri \u00fczerinde yap\u0131lmas\u0131 sa\u011flanabilir.<br \/>\n* <strong>PART\u0130T\u0130ON:<\/strong> B\u00fcy\u00fck tablolar\u0131 mant\u0131kl\u0131 par\u00e7alara b\u00f6lmek (partitioning),  s\u0131ralama i\u015flemini daha h\u0131zl\u0131 hale getirebilir.<br \/>\n* <strong>Analiz:<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutuyla sorgu plan\u0131n\u0131 inceleyerek, performans darbo\u011fazlar\u0131n\u0131 tespit edebilir ve optimizasyon stratejileri geli\u015ftirebilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de <code class=\"language-\">ORDER BY<\/code> c\u00fcmleci\u011fi ile NULL de\u011ferlerini sona almak i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  <code class=\"language-\">CASE<\/code> ifadesi basit durumlarda yeterli olurken,  <code class=\"language-\">NULLS LAST<\/code> \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in daha verimli bir \u00e7\u00f6z\u00fcmd\u00fcr.  Performans optimizasyonu i\u00e7in indeksleme, <code class=\"language-\">WHERE<\/code> c\u00fcmleci\u011fi ve tabloyu b\u00f6lme gibi teknikler kullan\u0131lmal\u0131d\u0131r.  Uygun teknikleri se\u00e7erek, veritaban\u0131 sorgular\u0131n\u0131z\u0131n daha h\u0131zl\u0131 ve daha verimli \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flayabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">NULLS LAST<\/code> t\u00fcm PostgreSQL s\u00fcr\u00fcmlerinde destekleniyor mu?<\/strong> Hay\u0131r, <code class=\"language-\">NULLS LAST<\/code>  PostgreSQL 14 ve \u00fczeri s\u00fcr\u00fcmlerinde desteklenir. Daha eski s\u00fcr\u00fcmler i\u00e7in <code class=\"language-\">CASE<\/code> ifadesini kullanman\u0131z gerekir.<\/p>\n<p>2. <strong>Birden fazla s\u00fctuna g\u00f6re s\u0131ralama yaparken <code class=\"language-\">NULLS LAST<\/code> nas\u0131l kullan\u0131l\u0131r?<\/strong> Her s\u00fctun i\u00e7in ayr\u0131 ayr\u0131 <code class=\"language-\">NULLS LAST<\/code> belirtmelisiniz.<\/p>\n<p>3. <strong><code class=\"language-\">NULLS LAST<\/code> kullan\u0131m\u0131 performans\u0131 nas\u0131l etkiler?<\/strong> Genellikle <code class=\"language-\">CASE<\/code> ifadesine g\u00f6re daha verimlidir, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in.<\/p>\n<p>4. <strong>NULL de\u011ferlerini ba\u015fta g\u00f6stermek i\u00e7in nas\u0131l bir y\u00f6ntem kullan\u0131l\u0131r?<\/strong> <code class=\"language-\">NULLS FIRST<\/code>  (PostgreSQL 14 ve \u00fczeri) veya <code class=\"language-\">CASE<\/code> ifadesinde s\u0131ralaman\u0131z\u0131 buna g\u00f6re d\u00fczenleyebilirsiniz.<\/p>\n<p>5. <strong>PostgreSQL performans optimizasyonu hakk\u0131nda daha fazla bilgi nerede bulabilirim?<\/strong>  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de NULL De\u011ferlerini Sona Alma: ORDER BY Kullan\u0131m\u0131 PostgreSQL veritaban\u0131n\u0131zda s\u0131ralamalar yaparken NULL de\u011ferlerinin nas\u0131l ele al\u0131naca\u011f\u0131n\u0131&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-26850","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PostgreSQL: NULL De\u011ferleri Sonda S\u0131ralayarak ORDER BY Kullan\u0131m\u0131<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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