{"id":25948,"date":"2025-07-16T09:15:24","date_gmt":"2025-07-16T06:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-alfanumerik-degerleri-siralama\/"},"modified":"2025-07-16T09:15:24","modified_gmt":"2025-07-16T06:15:24","slug":"postgresql-alfanumerik-degerleri-siralama","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-alfanumerik-degerleri-siralama\/","title":{"rendered":"PostgreSQL: Alfan\u00fcmerik De\u011ferleri S\u0131ralama"},"content":{"rendered":"<p># PostgreSQL&#8217;de Alfan\u00fcmerik De\u011ferleri S\u0131ralama<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda alfan\u00fcmerik verileri (\u00f6rne\u011fin, \u00fcr\u00fcn kodlar\u0131, sipari\u015f numaralar\u0131, kar\u0131\u015f\u0131k metinler) do\u011fru bir \u015fekilde s\u0131ralamak m\u0131 istiyorsunuz?  Yanl\u0131\u015f s\u0131ralama, raporlamalarda hatalara, verilerin yanl\u0131\u015f yorumlanmas\u0131na ve i\u015f s\u00fcre\u00e7lerinde aksakl\u0131klara yol a\u00e7abilir. Bu makale, PostgreSQL&#8217;de alfan\u00fcmerik de\u011ferleri etkili ve do\u011fru bir \u015fekilde s\u0131ralamak i\u00e7in ad\u0131m ad\u0131m bir rehber sunuyor.  Ba\u015flang\u0131\u00e7 seviyesinden ileri d\u00fczeye kadar, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle desteklenmi\u015f pratik \u00e7\u00f6z\u00fcmler ve performans optimizasyonu ipu\u00e7lar\u0131 bulacaks\u0131n\u0131z.<\/p>\n<p><strong>PostgreSQL&#8217;de Alfan\u00fcmerik S\u0131ralama: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, varsay\u0131lan olarak, alfan\u00fcmerik de\u011ferleri alfabetik olarak s\u0131ralar. Ancak, bu s\u0131ralama, say\u0131sal bile\u015fenler i\u00e7eren de\u011ferlerde beklenmedik sonu\u00e7lar do\u011furabilir. \u00d6rne\u011fin, &#8220;A10&#8221;, &#8220;A2&#8243;den \u00f6nce s\u0131ralan\u0131r \u00e7\u00fcnk\u00fc karakter kar\u015f\u0131la\u015ft\u0131rmas\u0131 yap\u0131l\u0131r.  Bu durum, \u00fcr\u00fcn kodlar\u0131 gibi say\u0131sal bir anlam ifade eden alfan\u00fcmerik verilerde sorunlara neden olur.  Bu problemi \u00e7\u00f6zmek i\u00e7in, do\u011fru s\u0131ralama fonksiyonlar\u0131n\u0131 ve tekniklerini kullanmak gerekir.  Bu fonksiyonlar, verilerin yap\u0131s\u0131na ve s\u0131ralama gereksinimlerine g\u00f6re de\u011fi\u015febilir.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama: Ad\u0131m Ad\u0131m Uygulama Rehberi (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>Yeni ba\u015flayanlar i\u00e7in, basit bir \u00f6rnek \u00fczerinden alfan\u00fcmerik s\u0131ralamay\u0131 ele alal\u0131m.  A\u015fa\u011f\u0131daki tabloda, \u00fcr\u00fcn kodlar\u0131 ve isimleri bulunmaktad\u0131r:<\/p>\n<p>| \u00dcr\u00fcn Kodu | \u00dcr\u00fcn Ad\u0131 |<br \/>\n|&#8212;|&#8212;|<br \/>\n| A10 | \u00dcr\u00fcn A10 |<br \/>\n| A2 | \u00dcr\u00fcn A2 |<br \/>\n| B5 | \u00dcr\u00fcn B5 |<br \/>\n| A1 | \u00dcr\u00fcn A1 |<br \/>\n| C20 | \u00dcr\u00fcn C20 |<\/p>\n<p>Bu verileri \u00fcr\u00fcn koduna g\u00f6re s\u0131ralamak i\u00e7in a\u015fa\u011f\u0131daki SQL sorgusunu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM urunler ORDER BY urun_kodu;<\/code><\/pre>\n<p>Bu sorgu, varsay\u0131lan s\u0131ralama davran\u0131\u015f\u0131yla \u00e7al\u0131\u015f\u0131r ve beklenmedik bir sonu\u00e7 verir: A1, A10, A2, B5, C20.  Do\u011fru s\u0131ralamay\u0131 elde etmek i\u00e7in, say\u0131sal k\u0131sm\u0131 ay\u0131r\u0131p say\u0131sal olarak s\u0131ralamam\u0131z gerekir.  Bunun i\u00e7in, <code class=\"language-\">substring<\/code> ve <code class=\"language-\">CAST<\/code> fonksiyonlar\u0131n\u0131 kullanabiliriz.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama: Geli\u015fmi\u015f Teknikler (Orta Seviye)<\/strong><\/p>\n<p>Daha karma\u015f\u0131k alfan\u00fcmerik verileri s\u0131ralamak i\u00e7in, daha geli\u015fmi\u015f teknikler kullanmam\u0131z gerekebilir. \u00d6rne\u011fin, \u00fcr\u00fcn kodlar\u0131 harf ve say\u0131sal k\u0131s\u0131mlardan olu\u015fabilir ve harf k\u0131sm\u0131 da farkl\u0131 uzunluklara sahip olabilir. Bu durumda, <code class=\"language-\">substring<\/code>, <code class=\"language-\">CAST<\/code> ve <code class=\"language-\">CASE<\/code> gibi fonksiyonlar\u0131 birle\u015ftirerek daha karma\u015f\u0131k s\u0131ralama ko\u015fullar\u0131 olu\u015fturabiliriz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi:<\/strong>  Bir e-ticaret sitesinin sipari\u015f numaralar\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcn.  Sipari\u015f numaralar\u0131 &#8220;ORDER-20231027-123&#8221; gibi bir formatta olabilir.  Bu numaralar\u0131 do\u011fru bir \u015fekilde s\u0131ralamak i\u00e7in, tarih k\u0131sm\u0131n\u0131 ve say\u0131sal k\u0131sm\u0131 ayr\u0131 ayr\u0131 s\u0131ralamam\u0131z gerekir.<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM siparisler\nORDER BY \n    CAST(substring(siparis_numarasi FROM 'ORDER-(\\d{8})-(\\d+)') AS DATE),\n    CAST(substring(siparis_numarasi FROM 'ORDER-\\d{8}-(\\d+)') AS INTEGER);<\/code><\/pre>\n<p>Bu sorgu, \u00f6nce tarih k\u0131sm\u0131n\u0131, sonra say\u0131sal k\u0131sm\u0131 s\u0131ralayarak do\u011fru s\u0131ralmay\u0131 sa\u011flar.  Bu \u00f6rnekte,  <code class=\"language-\">substring<\/code> fonksiyonu ile tarih ve say\u0131sal k\u0131s\u0131mlar ayr\u0131l\u0131r ve <code class=\"language-\">CAST<\/code> fonksiyonu ile do\u011fru veri tipine d\u00f6n\u00fc\u015ft\u00fcr\u00fclerek s\u0131ralama i\u015flemi ger\u00e7ekle\u015ftirilir.  [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesinden daha fazla PostgreSQL optimizasyon tekni\u011fi \u00f6\u011frenebilirsiniz.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama: Performans Optimizasyonu (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, alfan\u00fcmerik s\u0131ralama performans\u0131 \u00f6nemli bir fakt\u00f6rd\u00fcr.  Veri tiplerini do\u011fru se\u00e7mek, uygun indeksler olu\u015fturmak ve SQL sorgular\u0131n\u0131 optimize etmek performans\u0131 art\u0131r\u0131r.<\/p>\n<p><strong>Performans Analizi:<\/strong>  S\u0131ralama sorgular\u0131n\u0131n performans\u0131n\u0131 analiz etmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanabiliriz. Bu komut, sorgu y\u00fcr\u00fctme plan\u0131n\u0131 ve y\u00fcr\u00fctme s\u00fcresini g\u00f6sterir.  Yava\u015f \u00e7al\u0131\u015fan sorgular\u0131 tespit edip optimize edebiliriz.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong>  Alfan\u00fcmerik verilerde bo\u015f de\u011ferler, \u00f6zel karakterler veya farkl\u0131 dil deste\u011fi gibi durumlar performans\u0131 etkileyebilir.  Bu durumlar\u0131 ele almak i\u00e7in, <code class=\"language-\">NULLS FIRST<\/code> veya <code class=\"language-\">NULLS LAST<\/code> gibi se\u00e7enekleri kullanabilir ve collation ayarlar\u0131n\u0131 do\u011fru \u015fekilde yap\u0131land\u0131rabiliriz.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama:  COLLATE Kullan\u0131m\u0131<\/strong><\/p>\n<p>PostgreSQL, farkl\u0131 diller i\u00e7in farkl\u0131 s\u0131ralama kurallar\u0131 (collation) sunar.  <code class=\"language-\">COLLATE<\/code> anahtar kelimesi ile s\u0131ralama i\u015fleminde kullan\u0131lacak collation&#8217;\u0131 belirleyebilirsiniz. \u00d6rne\u011fin, T\u00fcrk\u00e7e karakterleri do\u011fru bir \u015fekilde s\u0131ralamak i\u00e7in <code class=\"language-\">tr_TR.UTF8<\/code> collation&#8217;\u0131n\u0131 kullanabilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM urunler ORDER BY urun_kodu COLLATE tr_TR.UTF8;<\/code><\/pre>\n<p>Bu, T\u00fcrk\u00e7e karakterlerin do\u011fru s\u0131ralamas\u0131n\u0131 sa\u011flar.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama:  Fonksiyonel Yakla\u015f\u0131mlar<\/strong><\/p>\n<p>Karma\u015f\u0131k s\u0131ralama gereksinimleri i\u00e7in, kendi \u00f6zel s\u0131ralama fonksiyonlar\u0131n\u0131z\u0131 olu\u015fturabilirsiniz.  Bu fonksiyonlar, verilerin yap\u0131s\u0131na \u00f6zel olarak tasarlanabilir ve performans\u0131 art\u0131rabilir.  \u00d6rne\u011fin, bir \u00fcr\u00fcn kodunun \u00f6nce harf k\u0131sm\u0131n\u0131, sonra say\u0131sal k\u0131sm\u0131n\u0131 ayr\u0131 ayr\u0131 de\u011ferlendiren bir fonksiyon yazabilirsiniz.<\/p>\n<p><strong>PostgreSQL Alfan\u00fcmerik S\u0131ralama: \u0130ndeksleme ve Optimizasyon<\/strong><\/p>\n<p>Veri setiniz b\u00fcy\u00fckse, s\u0131ralama i\u015fleminin performans\u0131n\u0131 art\u0131rmak i\u00e7in indeksleme \u00e7ok \u00f6nemlidir.  S\u0131ralama i\u015fleminde kullan\u0131lan s\u00fctunlara indeks olu\u015fturarak, veritaban\u0131n\u0131n s\u0131ralama i\u015flemini daha h\u0131zl\u0131 ger\u00e7ekle\u015ftirmesini sa\u011flayabilirsiniz.  Ancak, indekslerin boyutunu ve bak\u0131m maliyetini de g\u00f6z \u00f6n\u00fcnde bulundurmal\u0131s\u0131n\u0131z.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de alfan\u00fcmerik de\u011ferleri do\u011fru ve etkili bir \u015fekilde s\u0131ralamak, verilerin do\u011fru yorumlanmas\u0131 ve i\u015f s\u00fcre\u00e7lerinin verimlili\u011fi i\u00e7in hayati \u00f6nem ta\u015f\u0131r.  Bu makalede ele al\u0131nan teknikleri kullanarak, farkl\u0131 karma\u015f\u0131kl\u0131k seviyelerindeki alfan\u00fcmerik s\u0131ralama problemlerini \u00e7\u00f6zebilirsiniz.  Unutmay\u0131n ki, performans optimizasyonu i\u00e7in do\u011fru indeksleme ve SQL sorgu optimizasyonu tekniklerini uygulamak \u00f6nemlidir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>PostgreSQL&#8217;de hangi veri tipleri alfan\u00fcmerik de\u011ferler i\u00e7in uygundur?<\/strong>  <code class=\"language-\">TEXT<\/code>, <code class=\"language-\">VARCHAR<\/code>, <code class=\"language-\">CHARACTER VARYING<\/code> gibi veri tipleri alfan\u00fcmerik de\u011ferler i\u00e7in uygundur.<\/p>\n<p>2. <strong>Bo\u015f de\u011ferleri nas\u0131l s\u0131ralayabilirim?<\/strong> <code class=\"language-\">NULLS FIRST<\/code> veya <code class=\"language-\">NULLS LAST<\/code> se\u00e7eneklerini kullanarak bo\u015f de\u011ferlerin s\u0131ralama s\u0131ras\u0131n\u0131 belirleyebilirsiniz.<\/p>\n<p>3. <strong>Farkl\u0131 dillerdeki karakterleri nas\u0131l do\u011fru s\u0131ralar\u0131m?<\/strong>  <code class=\"language-\">COLLATE<\/code> anahtar kelimesi ile ilgili dilin collation&#8217;\u0131n\u0131 belirleyebilirsiniz.<\/p>\n<p>4. <strong>Performans sorunlar\u0131yla kar\u015f\u0131la\u015ft\u0131\u011f\u0131mda ne yapmal\u0131y\u0131m?<\/strong> <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu y\u00fcr\u00fctme plan\u0131n\u0131 analiz edin ve gerekli optimizasyonlar\u0131 yap\u0131n.<\/p>\n<p>5. <strong>Karma\u015f\u0131k s\u0131ralama gereksinimleri i\u00e7in ne yapabilirim?<\/strong>  Kendi \u00f6zel s\u0131ralama fonksiyonlar\u0131n\u0131z\u0131 olu\u015fturabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Alfan\u00fcmerik De\u011ferleri S\u0131ralama PostgreSQL veritaban\u0131n\u0131zda alfan\u00fcmerik verileri (\u00f6rne\u011fin, \u00fcr\u00fcn kodlar\u0131, sipari\u015f numaralar\u0131, kar\u0131\u015f\u0131k metinler) do\u011fru bir&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-25948","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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