{"id":26804,"date":"2025-08-01T00:15:24","date_gmt":"2025-07-31T21:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-diziyi-satirlara-donusturme\/"},"modified":"2025-08-01T00:15:24","modified_gmt":"2025-07-31T21:15:24","slug":"postgresql-diziyi-satirlara-donusturme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-diziyi-satirlara-donusturme\/","title":{"rendered":"PostgreSQL: Diziyi Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme"},"content":{"rendered":"<p># PostgreSQL Dizileri Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme: Ad\u0131m Ad\u0131m Rehber<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda dizi tipinde saklad\u0131\u011f\u0131n\u0131z verileri analiz etmek veya i\u015flemek mi istiyorsunuz?  Tek bir s\u00fctunda birden fazla de\u011feri tutan dizi verilerinin, her bir de\u011ferin ayr\u0131 bir sat\u0131rda yer ald\u0131\u011f\u0131 bir tabloya d\u00f6n\u00fc\u015ft\u00fcr\u00fclmesi, veri analizi ve raporlama i\u00e7in hayati \u00f6nem ta\u015f\u0131r.  Bu makale, PostgreSQL&#8217;de dizi verilerini sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrmenin farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rneklerini ad\u0131m ad\u0131m ele alarak, yeni ba\u015flayanlardan uzman seviyesine kadar herkese rehberlik edecektir.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu rehber, PostgreSQL dizi sat\u0131r d\u00f6n\u00fc\u015f\u00fcm\u00fcn\u00fc \u00fc\u00e7 seviyede ele almaktad\u0131r:<\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> Temel <code class=\"language-\">unnest()<\/code> fonksiyonu ile basit \u00f6rnekler.<br \/>\n* <strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, birden fazla s\u00fctunlu diziler ve optimizasyon teknikleri.<br \/>\n* <strong>\u0130leri Seviye:<\/strong> Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri ve karma\u015f\u0131k senaryolar i\u00e7in \u00e7\u00f6z\u00fcmler.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Verileri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, veritaban\u0131 y\u00f6netim sistemlerinde yayg\u0131n olarak kullan\u0131lan bir dizi veri tipi sunar.  Bu diziler, tek bir s\u00fctunda birden fazla de\u011feri virg\u00fcl (,) veya ba\u015fka bir ay\u0131r\u0131c\u0131 ile ayr\u0131lm\u0131\u015f olarak saklaman\u0131za olanak tan\u0131r. \u00d6rne\u011fin, bir kullan\u0131c\u0131n\u0131n sevdi\u011fi renkleri <code class=\"language-\">{\"k\u0131rm\u0131z\u0131\",\"ye\u015fil\",\"mavi\"}<\/code> \u015feklinde bir dizi olarak saklayabilirsiniz. Ancak, bu verileri analiz etmek veya raporlamak i\u00e7in her bir rengin ayr\u0131 bir sat\u0131rda olmas\u0131 gerekir.  Bu noktada diziyi sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrme ihtiyac\u0131 ortaya \u00e7\u0131kar.<\/p>\n<p><strong>PostgreSQL Dizilerini Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme: Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>En basit y\u00f6ntem, <code class=\"language-\">unnest()<\/code> fonksiyonunu kullanmakt\u0131r.  Bu fonksiyon, bir diziyi tek bir s\u00fctunlu bir sat\u0131r k\u00fcmesine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.<\/p>\n<p><strong>\u00d6rnek:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki tabloda, her kullan\u0131c\u0131n\u0131n sevdi\u011fi meyveler dizi olarak saklanmaktad\u0131r:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE users (\n    id SERIAL PRIMARY KEY,\n    fav_fruits TEXT[]\n);\n\nINSERT INTO users (fav_fruits) VALUES\n('{elma,armut,muz}'),\n('{\u00e7ilek,kiraz}'),\n('{elma,\u00fcz\u00fcm}');<\/code><\/pre>\n<p>\u015eimdi, <code class=\"language-\">unnest()<\/code> fonksiyonunu kullanarak bu dizileri sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrelim:<\/p>\n<pre class=\"language-sql\"><code>SELECT id, unnest(fav_fruits) AS fruit\nFROM users;<\/code><\/pre>\n<p>Bu sorgu, her bir kullan\u0131c\u0131n\u0131n ID&#8217;si ve sevdi\u011fi her meyve i\u00e7in ayr\u0131 bir sat\u0131r d\u00f6nd\u00fcr\u00fcr.  Sonu\u00e7 a\u015fa\u011f\u0131daki gibi olacakt\u0131r:<\/p>\n<p>| id | fruit |<br \/>\n|&#8212;|&#8212;|<br \/>\n| 1 | elma |<br \/>\n| 1 | armut |<br \/>\n| 1 | muz |<br \/>\n| 2 | \u00e7ilek |<br \/>\n| 2 | kiraz |<br \/>\n| 3 | elma |<br \/>\n| 3 | \u00fcz\u00fcm |<\/p>\n<p><strong>Birden Fazla S\u00fctunlu Dizileri Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme: Orta Seviye<\/strong><\/p>\n<p>E\u011fer dizileriniz birden fazla s\u00fctunu temsil ediyorsa, <code class=\"language-\">unnest()<\/code> fonksiyonunu daha karma\u015f\u0131k bir \u015fekilde kullanman\u0131z gerekebilir.  \u00d6rne\u011fin, her kullan\u0131c\u0131n\u0131n sevdi\u011fi meyveler ve renkleri i\u00e7eren bir dizi d\u00fc\u015f\u00fcn\u00fcn:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE users_complex (\n    id SERIAL PRIMARY KEY,\n    fav_items TEXT[][]\n);\n\nINSERT INTO users_complex (fav_items) VALUES\n('{{&quot;elma&quot;,&quot;k\u0131rm\u0131z\u0131&quot;},{&quot;armut&quot;,&quot;ye\u015fil&quot;}}'),\n('{{&quot;\u00e7ilek&quot;,&quot;k\u0131rm\u0131z\u0131&quot;},{&quot;muz&quot;,&quot;sar\u0131&quot;}}');<\/code><\/pre>\n<p>Bu durumda, her bir i\u00e7 diziyi ayr\u0131 ayr\u0131 i\u015fleyerek sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrmemiz gerekir:<\/p>\n<pre class=\"language-sql\"><code>SELECT id, unnest(fav_items) AS item_array\nFROM users_complex;<\/code><\/pre>\n<p>Bu, her kullan\u0131c\u0131n\u0131n <code class=\"language-\">fav_items<\/code> dizisinin bir sat\u0131ra d\u00f6n\u00fc\u015ft\u00fcr\u00fclm\u00fc\u015f halini verir.  Daha sonra, <code class=\"language-\">item_array<\/code> dizisinin i\u00e7ini a\u00e7mak i\u00e7in bir alt sorgu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT id, unnest(item_array) as item FROM (\nSELECT id, unnest(fav_items) AS item_array\nFROM users_complex\n) as subquery;<\/code><\/pre>\n<p>Daha sonra, her bir \u00f6\u011feyi ayr\u0131 s\u00fctunlara ay\u0131rmak i\u00e7in <code class=\"language-\">unnest()<\/code>&#8216;i tekrar kullanabilirsiniz ancak bu y\u00f6ntem olduk\u00e7a karma\u015f\u0131kt\u0131r. Daha verimli bir y\u00f6ntem, PostgreSQL&#8217;in sa\u011flad\u0131\u011f\u0131 <code class=\"language-\">jsonb<\/code> veri tipi kullanarak dizileri daha yap\u0131land\u0131r\u0131lm\u0131\u015f bir \u015fekilde saklamakt\u0131r. Bu, verileri daha kolay ve verimli bir \u015fekilde i\u015fleme olana\u011f\u0131 sa\u011flar.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131 ve Vaka \u00c7al\u0131\u015fmalar\u0131: E-Ticaret \u00d6rne\u011fi<\/strong><\/p>\n<p>Bir e-ticaret sitesinin kullan\u0131c\u0131 sipari\u015flerini d\u00fc\u015f\u00fcn\u00fcn.  Her sipari\u015f, birden fazla \u00fcr\u00fcn i\u00e7erebilir ve bu \u00fcr\u00fcnler bir dizi olarak saklanabilir.  \u00d6rne\u011fin, <code class=\"language-\">{\"\u00fcr\u00fcn1\", \"\u00fcr\u00fcn2\", \"\u00fcr\u00fcn3\"}<\/code> gibi.  Bu dizileri sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrerek, her sipari\u015fin ayr\u0131nt\u0131lar\u0131n\u0131 daha kolay analiz edebiliriz.  Bu, hangi \u00fcr\u00fcnlerin en \u00e7ok sat\u0131ld\u0131\u011f\u0131n\u0131, hangi \u00fcr\u00fcnlerin birlikte sat\u0131n al\u0131nd\u0131\u011f\u0131n\u0131 vb. belirlemek i\u00e7in kullan\u0131labilecek veriler sa\u011flar.<\/p>\n<p><strong>Performans Optimizasyonu ve B\u00fcy\u00fck Veri K\u00fcmeleri<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in <code class=\"language-\">unnest()<\/code> fonksiyonunun performans\u0131 d\u00fc\u015febilir.  Performans\u0131 iyile\u015ftirmek i\u00e7in a\u015fa\u011f\u0131daki y\u00f6ntemleri deneyebilirsiniz:<\/p>\n<p>* <strong>\u0130ndeksleme:<\/strong> Dizi s\u00fctununa indeks eklemek, <code class=\"language-\">unnest()<\/code> i\u015fleminin h\u0131z\u0131n\u0131 art\u0131rabilir. Ancak, dizi s\u00fctunlar\u0131na indeksleme her zaman etkili olmayabilir.<br \/>\n* <strong>Materyalize G\u00f6r\u00fcn\u00fcmler:<\/strong>  S\u0131k\u00e7a kullan\u0131lan dizi-sat\u0131r d\u00f6n\u00fc\u015f\u00fcm sorgular\u0131n\u0131 materyalize g\u00f6r\u00fcn\u00fcmler olarak kaydederek performans\u0131 art\u0131rabilirsiniz.  Bu, sorgunun her seferinde yeniden hesaplanmas\u0131n\u0131 \u00f6nler.<br \/>\n* <strong>Par\u00e7al\u0131 \u0130\u015fleme:<\/strong> \u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, veriyi daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lerek ve her par\u00e7ay\u0131 ayr\u0131 ayr\u0131 i\u015fleyerek performans\u0131 iyile\u015ftirebilirsiniz.<\/p>\n<p><strong>PostgreSQL Dizilerini Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme: \u0130leri D\u00fczey Teknikler ve Edge Case&#8217;ler<\/strong><\/p>\n<p>Baz\u0131 durumlarda, diziler bo\u015f olabilir veya farkl\u0131 uzunluklarda olabilir.  Bu durumlar i\u00e7in, NULL de\u011ferlerini ele almak ve sorgular\u0131n\u0131z\u0131 buna g\u00f6re ayarlamak \u00f6nemlidir.  \u00d6rne\u011fin, bo\u015f diziler i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanabilirsiniz.<\/p>\n<p>Ayr\u0131ca, \u00e7ok boyutlu dizilerle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">unnest()<\/code> fonksiyonunu birden fazla kez kullanman\u0131z gerekebilir.  Bu, sorgu karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 art\u0131rabilir, bu y\u00fczden dikkatli planlama ve test gereklidir.  Performans analizi i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu plan\u0131n\u0131z\u0131 inceleyebilirsiniz.  Bu, sorguyu optimize etmenize yard\u0131mc\u0131 olur.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de dizi verilerini sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrmek, veri analizi ve raporlama i\u00e7in \u00f6nemli bir i\u015flemdir.  <code class=\"language-\">unnest()<\/code> fonksiyonu, bu i\u015flemi ger\u00e7ekle\u015ftirmenin en yayg\u0131n ve basit yoludur.  Ancak, b\u00fcy\u00fck veri k\u00fcmeleri veya karma\u015f\u0131k senaryolar i\u00e7in performans optimizasyonu ve ileri d\u00fczey teknikler gerekli olabilir.  Bu makalede ele al\u0131nan y\u00f6ntemler ve \u00f6rnekler, PostgreSQL&#8217;de dizi verilerini etkili bir \u015fekilde y\u00f6netmenize yard\u0131mc\u0131 olacakt\u0131r.  Uygulamaya \u00f6zel \u00e7\u00f6z\u00fcmler i\u00e7in,  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresindeki di\u011fer makalelerime g\u00f6z atabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">unnest()<\/code> fonksiyonu, bo\u015f dizilerle nas\u0131l ba\u015fa \u00e7\u0131kar?<\/strong>  <code class=\"language-\">unnest()<\/code> fonksiyonu, bo\u015f diziler i\u00e7in hi\u00e7bir sat\u0131r d\u00f6nd\u00fcrmez.  Bo\u015f dizileri ele almak i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanabilirsiniz.<\/p>\n<p>2. <strong>\u00c7ok boyutlu dizileri nas\u0131l sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrebilirim?<\/strong> \u00c7ok boyutlu diziler i\u00e7in, <code class=\"language-\">unnest()<\/code> fonksiyonunu birden fazla kez i\u00e7 i\u00e7e kullanman\u0131z gerekebilir veya alternatif olarak <code class=\"language-\">jsonb<\/code> veri tipini kullanarak daha yap\u0131land\u0131r\u0131lm\u0131\u015f bir yakla\u015f\u0131m izleyebilirsiniz.<\/p>\n<p>3. <strong>Performans\u0131 nas\u0131l optimize edebilirim?<\/strong> \u0130ndeksleme, materyalize g\u00f6r\u00fcn\u00fcmler ve par\u00e7al\u0131 i\u015fleme gibi y\u00f6ntemler performans\u0131 iyile\u015ftirmeye yard\u0131mc\u0131 olabilir.<\/p>\n<p>4. <strong>Hangi veri tipi dizi d\u00f6n\u00fc\u015f\u00fcm\u00fc i\u00e7in en uygunudur?<\/strong>  Veri yap\u0131n\u0131z\u0131n karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 ve performans gereksinimlerinizi g\u00f6z \u00f6n\u00fcnde bulundurarak karar vermeniz gerekir. Basit diziler i\u00e7in <code class=\"language-\">TEXT[]<\/code> yeterli olurken, karma\u015f\u0131k yap\u0131lar i\u00e7in <code class=\"language-\">jsonb<\/code> daha uygun olabilir.<\/p>\n<p>5. <strong>Dizi elemanlar\u0131 farkl\u0131 veri tiplerindeyse ne yapmal\u0131y\u0131m?<\/strong>  Bu durumda, <code class=\"language-\">unnest()<\/code>&#8216;i kullanmadan \u00f6nce her eleman\u0131 do\u011fru veri tipine d\u00f6n\u00fc\u015ft\u00fcrmeniz gerekebilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL Dizileri Sat\u0131rlara D\u00f6n\u00fc\u015ft\u00fcrme: Ad\u0131m Ad\u0131m Rehber PostgreSQL veritaban\u0131n\u0131zda dizi tipinde saklad\u0131\u011f\u0131n\u0131z verileri analiz etmek veya i\u015flemek&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-26804","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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