{"id":25635,"date":"2025-07-10T06:15:33","date_gmt":"2025-07-10T03:15:33","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-how-to-find-union-of-two-arrays-ceviri\/"},"modified":"2025-07-10T06:15:33","modified_gmt":"2025-07-10T03:15:33","slug":"postgresql-how-to-find-union-of-two-arrays-ceviri","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-how-to-find-union-of-two-arrays-ceviri\/","title":{"rendered":"PostgreSQL: How to Find Union of Two Arrays (\u00c7eviri)"},"content":{"rendered":"<p># PostgreSQL&#8217;de \u0130ki Dizinin Birle\u015fimini Bulmak: Ad\u0131m Ad\u0131m K\u0131lavuz<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda iki diziyi birle\u015ftirmeniz mi gerekiyor?  \u00d6rne\u011fin, bir kullan\u0131c\u0131n\u0131n iki farkl\u0131 al\u0131\u015fveri\u015f sepetindeki \u00fcr\u00fcnlerini tek bir listede toplamak, ya da iki farkl\u0131 kaynaktan gelen veri k\u00fcmelerini birle\u015ftirmek istiyor olabilirsiniz. Bu makale, PostgreSQL&#8217;de iki dizinin birle\u015fimini bulman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonunu ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ad\u0131m ad\u0131m a\u00e7\u0131klayarak, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkese rehberlik edecektir.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> Temel <code class=\"language-\">unnest<\/code> fonksiyonu ile dizi birle\u015fimi, basit kod \u00f6rnekleri.<br \/>\n* <strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat senaryolar\u0131, <code class=\"language-\">array_append<\/code>, <code class=\"language-\">array_cat<\/code> fonksiyonlar\u0131 ve optimizasyon ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri Seviye:<\/strong> Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in \u00e7\u00f6z\u00fcmler ve kenar durumlar\u0131 (edge cases).<\/p>\n<p><strong>PostgreSQL Dizileriyle \u00c7al\u0131\u015fmaya Giri\u015f<\/strong><\/p>\n<p>PostgreSQL, veritaban\u0131 y\u00f6netim sistemlerinde yayg\u0131n olarak kullan\u0131lan g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Diziler, ayn\u0131 veri tipindeki birden fazla de\u011feri tek bir de\u011fi\u015fkende saklamay\u0131 sa\u011flar.  Bu, verileri daha verimli bir \u015fekilde y\u00f6netmeyi ve sorgulamay\u0131 m\u00fcmk\u00fcn k\u0131lar. \u00d6rne\u011fin, bir kullan\u0131c\u0131n\u0131n favori renklerini (<code class=\"language-\">{k\u0131rm\u0131z\u0131, mavi, ye\u015fil}<\/code>) veya bir \u00fcr\u00fcn\u00fcn \u00f6zelliklerini (<code class=\"language-\">{k\u00fc\u00e7\u00fck, hafif, dayan\u0131kl\u0131}<\/code>) bir dizi i\u00e7inde saklayabilirsiniz. Ancak, iki farkl\u0131 dizinin elemanlar\u0131n\u0131 birle\u015ftirmek istedi\u011finizde, \u00f6zel fonksiyonlar kullanman\u0131z gerekir.  Bu makalede, bu fonksiyonlar\u0131 ve bunlar\u0131n nas\u0131l kullan\u0131laca\u011f\u0131n\u0131 detayl\u0131 olarak inceleyece\u011fiz.<\/p>\n<p><strong>PostgreSQL&#8217;de \u0130ki Dizinin Birle\u015fimini Bulma: Temel Y\u00f6ntem (Yeni Ba\u015flayanlar \u0130\u00e7in)<\/strong><\/p>\n<p>En temel y\u00f6ntem, <code class=\"language-\">unnest<\/code> fonksiyonunu kullanarak dizileri \u00f6nce tek de\u011ferlere ay\u0131rmak, ard\u0131ndan <code class=\"language-\">UNION<\/code> operat\u00f6r\u00fcyle birle\u015ftirmektir.  Bu y\u00f6ntem basit ve anla\u015f\u0131lmas\u0131 kolayd\u0131r, ancak b\u00fcy\u00fck diziler i\u00e7in performans sorunlar\u0131na yol a\u00e7abilir.<\/p>\n<p><strong>\u00d6rnek:<\/strong><\/p>\n<p>\u0130ki dizi oldu\u011funu varsayal\u0131m:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE products (\n    id SERIAL PRIMARY KEY,\n    product_categories TEXT[]\n);\n\nINSERT INTO products (product_categories) VALUES ('{Elektronik, Giyim}');\nINSERT INTO products (product_categories) VALUES ('{Giyim, Kitap}');<\/code><\/pre>\n<p>\u015eimdi bu iki dizinin birle\u015fimini bulal\u0131m:<\/p>\n<pre class=\"language-sql\"><code>SELECT DISTINCT category\nFROM unnest((SELECT product_categories FROM products WHERE id = 1) || (SELECT product_categories FROM products WHERE id = 2)) AS category;<\/code><\/pre>\n<p>Bu sorgu, \u00f6nce her iki sat\u0131rdaki dizileri al\u0131r, daha sonra bu dizileri birle\u015ftirir (<code class=\"language-\">||<\/code>) ve son olarak <code class=\"language-\">unnest<\/code> fonksiyonu ile tek de\u011ferlere ay\u0131r\u0131r. <code class=\"language-\">DISTINCT<\/code> anahtar kelimesi ise tekrar eden de\u011ferleri ortadan kald\u0131r\u0131r.  Sonu\u00e7, <code class=\"language-\">{Elektronik, Giyim, Kitap}<\/code> olacakt\u0131r.<\/p>\n<p>Bu y\u00f6ntem, k\u00fc\u00e7\u00fck diziler i\u00e7in olduk\u00e7a uygundur, ancak b\u00fcy\u00fck dizilerde performans sorunlar\u0131na neden olabilir.  Daha b\u00fcy\u00fck veriler i\u00e7in alternatif y\u00f6ntemlere ihtiya\u00e7 duyabilirsiniz.<\/p>\n<p><strong>Daha Geli\u015fmi\u015f Y\u00f6ntemler: <code class=\"language-\">array_append<\/code> ve <code class=\"language-\">array_cat<\/code> (Orta Seviye)<\/strong><\/p>\n<p><code class=\"language-\">array_append<\/code> fonksiyonu, bir diziye yeni bir eleman eklemek i\u00e7in kullan\u0131l\u0131rken, <code class=\"language-\">array_cat<\/code> fonksiyonu iki diziyi birle\u015ftirmek i\u00e7in kullan\u0131l\u0131r. Bu fonksiyonlar, <code class=\"language-\">unnest<\/code> y\u00f6ntemine g\u00f6re daha verimli olabilir, \u00f6zellikle de dizilerin boyutlar\u0131 b\u00fcy\u00fck oldu\u011funda.<\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi:<\/strong><\/p>\n<p>Bir e-ticaret sitesinin kullan\u0131c\u0131lar\u0131n\u0131n al\u0131\u015fveri\u015f sepetlerini ele alal\u0131m.  Her kullan\u0131c\u0131 i\u00e7in iki farkl\u0131 sepetteki \u00fcr\u00fcnlerin ID&#8217;lerini sakl\u0131yoruz.  Bu iki sepeti tek bir listede birle\u015ftirmemiz gerekiyor.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE shopping_carts (\n    user_id INTEGER,\n    cart_id INTEGER,\n    product_ids INTEGER[]\n);\n\nINSERT INTO shopping_carts (user_id, cart_id, product_ids) VALUES (1, 1, '{1, 2, 3}');\nINSERT INTO shopping_carts (user_id, cart_id, product_ids) VALUES (1, 2, '{3, 4, 5}');<\/code><\/pre>\n<p>A\u015fa\u011f\u0131daki sorgu, <code class=\"language-\">array_cat<\/code> fonksiyonunu kullanarak kullan\u0131c\u0131 1&#8217;in iki sepetindeki \u00fcr\u00fcn ID&#8217;lerini tek bir dizide birle\u015ftirir:<\/p>\n<pre class=\"language-sql\"><code>SELECT array_cat((SELECT product_ids FROM shopping_carts WHERE user_id = 1 AND cart_id = 1), (SELECT product_ids FROM shopping_carts WHERE user_id = 1 AND cart_id = 2));<\/code><\/pre>\n<p>Sonu\u00e7: <code class=\"language-\">{1,2,3,3,4,5}<\/code> olacakt\u0131r. Tekrar eden de\u011ferleri ortadan kald\u0131rmak i\u00e7in <code class=\"language-\">DISTINCT<\/code> ile birlikte <code class=\"language-\">unnest<\/code> kullanabilirsiniz.<\/p>\n<p><strong>Performans Optimizasyonu ve B\u00fcy\u00fck Veri K\u00fcmeleri (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, performans optimizasyonu kritik \u00f6neme sahiptir.  <code class=\"language-\">unnest<\/code> fonksiyonu, b\u00fcy\u00fck dizilerde performans sorunlar\u0131na yol a\u00e7abilir.  Bu durumlarda, daha verimli y\u00f6ntemler kullanmak veya veritaban\u0131 yap\u0131n\u0131z\u0131 yeniden tasarlamak gerekebilir.  \u00d6rne\u011fin, dizileri normalle\u015ftirip ayr\u0131 bir tabloda saklamak performans\u0131 art\u0131rabilir.<\/p>\n<p><strong>Performans Analizi:<\/strong>  B\u00fcy\u00fck diziler i\u00e7in performans testleri yaparak farkl\u0131 y\u00f6ntemlerin performans\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131rabilir ve en uygun y\u00f6ntemi se\u00e7ebilirsiniz.  PostgreSQL&#8217;in sundu\u011fu <code class=\"language-\">EXPLAIN<\/code> komutu, sorgu plan\u0131n\u0131 analiz etmenize ve performans darbo\u011fazlar\u0131n\u0131 belirlemenize yard\u0131mc\u0131 olur.<\/p>\n<p><strong>Kenar Durumlar\u0131 (Edge Cases) ve \u00d6zel Durumlar<\/strong><\/p>\n<p>Bo\u015f dizilerle \u00e7al\u0131\u015f\u0131rken dikkatli olmak gerekir.  Bo\u015f bir dizi ile ba\u015fka bir diziyi birle\u015ftirmek, genellikle ikinci diziyi d\u00f6nd\u00fcr\u00fcr.  Bu t\u00fcr durumlar\u0131 ele almak i\u00e7in kodunuzu dikkatlice yazman\u0131z ve olas\u0131 bo\u015f dizi durumlar\u0131n\u0131 kontrol etmeniz \u00f6nemlidir.  Ayr\u0131ca, farkl\u0131 veri tiplerindeki dizileri birle\u015ftirmeye \u00e7al\u0131\u015f\u0131rken hata alabilirsiniz.  Her zaman ayn\u0131 veri tipindeki dizileri birle\u015ftirdi\u011finizden emin olun.<\/p>\n<p><strong>PostgreSQL Dizileriyle \u0130lgili S\u0131k\u00e7a Sorulan Sorular (SSS)<\/strong><\/p>\n<p>1. <strong>PostgreSQL&#8217;de diziler nas\u0131l olu\u015fturulur?<\/strong>  <code class=\"language-\">ARRAY[de\u011fer1, de\u011fer2, ...]<\/code> s\u00f6z dizimi kullan\u0131larak diziler olu\u015fturulabilir.<br \/>\n2. <strong>PostgreSQL&#8217;de dizi elemanlar\u0131na nas\u0131l eri\u015filir?<\/strong>  <code class=\"language-\">dizi[indeks]<\/code> s\u00f6z dizimi kullan\u0131larak dizi elemanlar\u0131na eri\u015filebilir.<br \/>\n3. <strong>PostgreSQL&#8217;de diziler nas\u0131l g\u00fcncellenir?<\/strong>  <code class=\"language-\">array_append<\/code>, <code class=\"language-\">array_remove<\/code>, <code class=\"language-\">array_replace<\/code> gibi fonksiyonlar kullan\u0131larak diziler g\u00fcncellenebilir.<br \/>\n4. <strong>PostgreSQL&#8217;de dizilerin boyutunu nas\u0131l bulurum?<\/strong>  <code class=\"language-\">array_length(dizi, boyut)<\/code> fonksiyonu kullan\u0131larak dizinin boyutu bulunabilir.<br \/>\n5. <strong>PostgreSQL&#8217;de bir dizide bir de\u011ferin olup olmad\u0131\u011f\u0131n\u0131 nas\u0131l kontrol ederim?<\/strong> <code class=\"language-\">dizi @> '{de\u011fer}'<\/code> operat\u00f6r\u00fc kullan\u0131larak kontrol edilebilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PostgreSQL&#8217;de iki dizinin birle\u015fimini bulman\u0131n farkl\u0131 y\u00f6ntemlerini inceledik.  Yeni ba\u015flayanlar i\u00e7in basit <code class=\"language-\">unnest<\/code> y\u00f6nteminden, orta ve ileri seviye kullan\u0131c\u0131lar i\u00e7in daha verimli <code class=\"language-\">array_append<\/code> ve <code class=\"language-\">array_cat<\/code> fonksiyonlar\u0131na ve performans optimizasyonuna kadar geni\u015f bir yelpazeyi kapsad\u0131k.  Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve \u00f6rneklerle konuyu peki\u015ftirdik.  Unutmay\u0131n ki, en uygun y\u00f6ntem, verilerinizin b\u00fcy\u00fckl\u00fc\u011f\u00fc ve yap\u0131s\u0131na ba\u011fl\u0131 olarak de\u011fi\u015febilir.  Performans testleri yaparak ve <code class=\"language-\">EXPLAIN<\/code> komutunu kullanarak en iyi performans\u0131 elde edebilece\u011finiz y\u00f6ntemi belirleyebilirsiniz.  Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL ile ilgili di\u011fer yaz\u0131lar\u0131n\u0131 inceleyebilirsiniz](https:\/\/fatihsoysal.com).<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de \u0130ki Dizinin Birle\u015fimini Bulmak: Ad\u0131m Ad\u0131m K\u0131lavuz PostgreSQL veritaban\u0131n\u0131zda iki diziyi birle\u015ftirmeniz mi gerekiyor? \u00d6rne\u011fin, 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-25635","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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