{"id":26945,"date":"2025-08-03T06:15:21","date_gmt":"2025-08-03T03:15:21","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-string_agg-fonksiyonunu-siralama-order-by-ile-kullanma\/"},"modified":"2025-08-03T06:15:21","modified_gmt":"2025-08-03T03:15:21","slug":"postgresql-string_agg-fonksiyonunu-siralama-order-by-ile-kullanma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-string_agg-fonksiyonunu-siralama-order-by-ile-kullanma\/","title":{"rendered":"PostgreSQL: string_agg Fonksiyonunu s\u0131ralama (Order By) ile kullanma"},"content":{"rendered":"<p># PostgreSQL: string_agg ile Order By Kullan\u0131m\u0131<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda birden fazla sat\u0131rdaki de\u011ferleri tek bir sat\u0131rda birle\u015ftirmeniz gerekiyor mu? \u00d6rne\u011fin, bir m\u00fc\u015fterinin yapt\u0131\u011f\u0131 t\u00fcm sipari\u015fleri tek bir alanda g\u00f6stermek, bir \u00fcr\u00fcn\u00fcn t\u00fcm yorumlar\u0131n\u0131 birle\u015ftirmek veya bir kullan\u0131c\u0131n\u0131n takip etti\u011fi t\u00fcm hesaplar\u0131 listelemek mi istiyorsunuz? \u0130\u015fte tam bu noktada <code class=\"language-\">string_agg<\/code> fonksiyonu devreye giriyor. Ancak <code class=\"language-\">string_agg<\/code> fonksiyonunu <code class=\"language-\">ORDER BY<\/code> ile birlikte kullanarak, birle\u015ftirme i\u015flemini istenen s\u0131rada ger\u00e7ekle\u015ftirmek daha da \u00f6nemlidir. Bu makalede, PostgreSQL&#8217;de <code class=\"language-\">string_agg<\/code> ve <code class=\"language-\">ORDER BY<\/code> kullan\u0131m\u0131n\u0131 ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve performans optimizasyon teknikleriyle ele alaca\u011f\u0131z.  PostgreSQL&#8217;in g\u00fc\u00e7l\u00fc birle\u015fik fonksiyonlar\u0131n\u0131 kullanarak verilerinizi daha etkili bir \u015fekilde y\u00f6netmeyi \u00f6\u011freneceksiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de string_agg ve ORDER BY: Temel Kavramlar<\/strong><\/p>\n<p><code class=\"language-\">string_agg<\/code> fonksiyonu, birden fazla sat\u0131rdaki verileri tek bir string de\u011ferinde birle\u015ftirmenizi sa\u011flar.  <code class=\"language-\">ORDER BY<\/code> ise bu birle\u015ftirme i\u015fleminin hangi s\u0131rada yap\u0131laca\u011f\u0131n\u0131 belirler.  \u00d6rne\u011fin, bir m\u00fc\u015fterinin sipari\u015f tarihlerini kronolojik s\u0131rada birle\u015ftirmek i\u00e7in <code class=\"language-\">ORDER BY<\/code> kullanman\u0131z gerekir.  <code class=\"language-\">string_agg<\/code>&#8216;in temel s\u00f6zdizimi \u015fu \u015fekildedir:<\/p>\n<pre class=\"language-sql\"><code>string_agg(expression, delimiter)<\/code><\/pre>\n<p>Burada <code class=\"language-\">expression<\/code> birle\u015ftirilecek de\u011ferleri temsil eder ve <code class=\"language-\">delimiter<\/code> ise de\u011ferler aras\u0131na eklenecek ayra\u00e7t\u0131r (\u00f6rne\u011fin, virg\u00fcl, bo\u015fluk vb.).  <code class=\"language-\">ORDER BY<\/code> ise <code class=\"language-\">string_agg<\/code> fonksiyonunun i\u00e7ine eklenerek birle\u015ftirme s\u0131ras\u0131n\u0131 kontrol eder:<\/p>\n<pre class=\"language-sql\"><code>string_agg(expression, delimiter) ORDER BY expression<\/code><\/pre>\n<p>\u00d6rne\u011fin, <code class=\"language-\">ORDER BY tarih ASC<\/code> ile sipari\u015f tarihlerini eski tarihten yeni tarihe do\u011fru s\u0131ralayabiliriz.<\/p>\n<p><strong>string_agg ve ORDER BY Nas\u0131l Kullan\u0131l\u0131r? (Ad\u0131m Ad\u0131m K\u0131lavuz)<\/strong><\/p>\n<p>\u00d6ncelikle basit bir \u00f6rnek ile ba\u015flayal\u0131m.  A\u015fa\u011f\u0131daki tabloda, m\u00fc\u015fterilerin sipari\u015flerini ve sipari\u015f tarihlerini tuttu\u011fumuzu varsayal\u0131m:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE siparisler (\n    musteri_id INT,\n    siparis_tarihi DATE,\n    siparis_adi TEXT\n);\n\nINSERT INTO siparisler (musteri_id, siparis_tarihi, siparis_adi) VALUES\n(1, '2024-01-15', '\u00dcr\u00fcn A'),\n(1, '2024-02-20', '\u00dcr\u00fcn B'),\n(1, '2024-03-10', '\u00dcr\u00fcn C'),\n(2, '2024-04-05', '\u00dcr\u00fcn D'),\n(2, '2024-04-12', '\u00dcr\u00fcn E');<\/code><\/pre>\n<p>\u015eimdi m\u00fc\u015fteri 1&#8217;in sipari\u015flerini tarih s\u0131ras\u0131na g\u00f6re birle\u015ftirelim:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    musteri_id,\n    string_agg(siparis_adi, ', ') AS siparisler\nFROM\n    siparisler\nWHERE\n    musteri_id = 1\nGROUP BY\n    musteri_id\nORDER BY\n    siparis_tarihi;<\/code><\/pre>\n<p>Bu sorgu, m\u00fc\u015fteri 1&#8217;in sipari\u015flerini virg\u00fclle ay\u0131rarak &#8220;\u00dcr\u00fcn A, \u00dcr\u00fcn B, \u00dcr\u00fcn C&#8221; \u015feklinde birle\u015ftirir ve <code class=\"language-\">ORDER BY siparis_tarihi<\/code> sayesinde tarih s\u0131ras\u0131na g\u00f6re birle\u015ftirme yapar.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: E-ticaret Sipari\u015f \u00d6zeti<\/strong><\/p>\n<p>Bir e-ticaret platformunda, her m\u00fc\u015fteri i\u00e7in yap\u0131lan t\u00fcm sipari\u015flerin \u00f6zetini olu\u015fturmak istedi\u011fimizi d\u00fc\u015f\u00fcnelim.  Bu \u00f6zet, sipari\u015f tarihlerini ve sipari\u015f edilen \u00fcr\u00fcnleri i\u00e7ermelidir.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    m.musteri_adi,\n    string_agg(s.siparis_adi || ' (' || s.siparis_tarihi || ')', ', ') AS siparis_ozet\nFROM\n    musteriler m\nJOIN\n    siparisler s ON m.musteri_id = s.musteri_id\nGROUP BY\n    m.musteri_adi\nORDER BY\n    m.musteri_adi;<\/code><\/pre>\n<p>Bu sorgu, m\u00fc\u015fteri adlar\u0131n\u0131 ve sipari\u015f \u00f6zetlerini i\u00e7eren bir sonu\u00e7 k\u00fcmesi \u00fcretir.  <code class=\"language-\">string_agg<\/code> fonksiyonu, her m\u00fc\u015fteri i\u00e7in sipari\u015f adlar\u0131n\u0131 ve tarihlerini birle\u015ftirir.<\/p>\n<p><strong>Performans Optimizasyonu: \u0130pu\u00e7lar\u0131 ve Teknikler<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">string_agg<\/code> fonksiyonunun performans\u0131n\u0131 etkileyebilecek fakt\u00f6rler vard\u0131r.  Bu fakt\u00f6rleri azaltmak i\u00e7in a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131n\u0131 kullanabilirsiniz:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">ORDER BY<\/code> kriteri \u00fczerinde indeks olu\u015fturmak sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>WHERE Klauzu:<\/strong>  Gerekli verileri filtrelemek i\u00e7in <code class=\"language-\">WHERE<\/code> klauzu kullan\u0131n.  Bu, <code class=\"language-\">string_agg<\/code> fonksiyonunun i\u015fleme s\u00fcresini k\u0131saltacakt\u0131r.<br \/>\n* <strong>LIMIT Klauzu:<\/strong>  \u00c7ok b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131yorsan\u0131z, <code class=\"language-\">LIMIT<\/code> klauzu kullanarak sonu\u00e7 k\u00fcmesini s\u0131n\u0131rlayabilirsiniz.<br \/>\n* <strong>Par\u00e7alama (Partitioning):<\/strong> B\u00fcy\u00fck tablolar i\u00e7in, tablolar\u0131 par\u00e7alamak sorgu performans\u0131n\u0131 iyile\u015ftirebilir.  [Fatih Soysal&#8217;\u0131n PostgreSQL performans optimizasyonu hakk\u0131ndaki yaz\u0131lar\u0131ndan](https:\/\/fatihsoysal.com) daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Kullan\u0131m: Edge Case&#8217;ler ve Karma\u015f\u0131k Sorgu \u00d6rnekleri<\/strong><\/p>\n<p><code class=\"language-\">string_agg<\/code> ile <code class=\"language-\">ORDER BY<\/code> kullan\u0131rken baz\u0131 \u00f6zel durumlarla kar\u015f\u0131la\u015fabilirsiniz. \u00d6rne\u011fin, <code class=\"language-\">NULL<\/code> de\u011ferlerin nas\u0131l ele al\u0131naca\u011f\u0131 veya \u00e7ok b\u00fcy\u00fck stringlerin nas\u0131l y\u00f6netilece\u011fi gibi durumlar.<\/p>\n<p><strong>NULL De\u011ferleri:<\/strong> <code class=\"language-\">NULL<\/code> de\u011ferleri <code class=\"language-\">string_agg<\/code> fonksiyonunda genellikle yoksay\u0131l\u0131r. E\u011fer <code class=\"language-\">NULL<\/code> de\u011ferleri de birle\u015ftirmek isterseniz, <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanabilirsiniz.<\/p>\n<p><strong>B\u00fcy\u00fck Stringler:<\/strong> \u00c7ok b\u00fcy\u00fck stringler olu\u015fturmaktan ka\u00e7\u0131nmak i\u00e7in, <code class=\"language-\">string_agg<\/code> fonksiyonunun \u00e7\u0131kt\u0131s\u0131n\u0131 daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lmeyi d\u00fc\u015f\u00fcnebilirsiniz.  Veya alternatif bir yakla\u015f\u0131m olarak, verileri JSON format\u0131nda birle\u015ftirmeyi deneyebilirsiniz.<\/p>\n<p><strong>string_agg ve ORDER BY ile \u00c7al\u0131\u015f\u0131rken S\u0131k\u00e7a Sorulan Sorular (SSS)<\/strong><\/p>\n<p>1. <strong>string_agg fonksiyonu maksimum string uzunlu\u011fu s\u0131n\u0131rlamas\u0131 var m\u0131d\u0131r?<\/strong> Evet, PostgreSQL&#8217;de <code class=\"language-\">string_agg<\/code> fonksiyonunun \u00fcretebilece\u011fi maksimum string uzunlu\u011fu vard\u0131r. Bu s\u0131n\u0131rlama, sisteminizin bellek kapasitesine ve kullan\u0131lan veri tiplerine ba\u011fl\u0131d\u0131r. \u00c7ok b\u00fcy\u00fck stringler olu\u015fturmaktan ka\u00e7\u0131nmak i\u00e7in verileri daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lmeyi d\u00fc\u015f\u00fcnebilirsiniz.<\/p>\n<p>2. <strong>string_agg fonksiyonu performans\u0131m\u0131 nas\u0131l etkiler?<\/strong>  <code class=\"language-\">string_agg<\/code> fonksiyonu, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken performans\u0131 etkileyebilir.  Performans\u0131 optimize etmek i\u00e7in yukar\u0131da belirtilen ipu\u00e7lar\u0131n\u0131 kullanman\u0131z \u00f6nerilir.<\/p>\n<p>3. <strong>string_agg ile ba\u015fka hangi fonksiyonlar\u0131 birlikte kullanabilirim?<\/strong>  <code class=\"language-\">string_agg<\/code> fonksiyonunu <code class=\"language-\">COALESCE<\/code>, <code class=\"language-\">CASE<\/code>, <code class=\"language-\">SUBSTRING<\/code> gibi di\u011fer fonksiyonlarla birlikte kullanarak daha karma\u015f\u0131k i\u015flemler ger\u00e7ekle\u015ftirebilirsiniz.<\/p>\n<p>4. <strong>ORDER BY kullanmadan string_agg fonksiyonunu kullanabilir miyim?<\/strong> Evet, <code class=\"language-\">ORDER BY<\/code> kullanmadan da <code class=\"language-\">string_agg<\/code> fonksiyonunu kullanabilirsiniz. Ancak bu durumda, birle\u015ftirme s\u0131ras\u0131 belirsiz olacakt\u0131r.<\/p>\n<p>5. <strong>string_agg fonksiyonu hangi veri tipleriyle \u00e7al\u0131\u015f\u0131r?<\/strong> <code class=\"language-\">string_agg<\/code> fonksiyonu, text, varchar gibi string veri tipleriyle \u00e7al\u0131\u015f\u0131r.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Yukar\u0131daki basit \u00f6rnekleri inceleyin ve kendi tablonuzda denemeler yap\u0131n.  Basit bir tablo olu\u015fturup, <code class=\"language-\">string_agg<\/code> ve <code class=\"language-\">ORDER BY<\/code> kullan\u0131m\u0131n\u0131 deneyimleyin.<\/p>\n<p><strong>Orta:<\/strong> Ger\u00e7ek d\u00fcnya \u00f6rne\u011fi olan e-ticaret sipari\u015f \u00f6zeti \u00f6rne\u011fini inceleyin ve kendi verilerinizle uyarlay\u0131n.  Performans optimizasyon ipu\u00e7lar\u0131n\u0131 uygulay\u0131n ve sonu\u00e7lar\u0131 g\u00f6zlemleyin.<\/p>\n<p><strong>\u0130leri D\u00fczey:<\/strong>  Edge case&#8217;leri inceleyin, karma\u015f\u0131k sorgu \u00f6rnekleri olu\u015fturun ve b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde performans testleri yap\u0131n.  Par\u00e7alama gibi ileri d\u00fczey optimizasyon tekniklerini ara\u015ft\u0131r\u0131n.  [Fatih Soysal&#8217;\u0131n](https:\/\/fatihsoysal.com)  PostgreSQL ile ilgili daha kapsaml\u0131 makalelerine g\u00f6z atarak bilgi birikiminizi geni\u015fletebilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL: string_agg ile Order By Kullan\u0131m\u0131 PostgreSQL veritaban\u0131n\u0131zda birden fazla sat\u0131rdaki de\u011ferleri tek bir sat\u0131rda birle\u015ftirmeniz gerekiyor&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-26945","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 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