{"id":25440,"date":"2025-07-06T12:15:19","date_gmt":"2025-07-06T09:15:19","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-union-sonuclarinda-ozel-siralama-nasil-kullanilir\/"},"modified":"2025-07-06T12:15:19","modified_gmt":"2025-07-06T09:15:19","slug":"postgresql-union-sonuclarinda-ozel-siralama-nasil-kullanilir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-union-sonuclarinda-ozel-siralama-nasil-kullanilir\/","title":{"rendered":"PostgreSQL: UNION Sonu\u00e7lar\u0131nda \u00d6zel S\u0131ralama Nas\u0131l Kullan\u0131l\u0131r"},"content":{"rendered":"

# PostgreSQL’de UNION Sonu\u00e7lar\u0131n\u0131 \u00d6zel S\u0131rada Nas\u0131l Kullan\u0131r\u0131m?<\/p>\n

PostgreSQL veritaban\u0131n\u0131zda birden fazla sorgunun sonu\u00e7lar\u0131n\u0131 birle\u015ftirmek ve bunlar\u0131 istedi\u011finiz \u00f6zel s\u0131rada g\u00f6r\u00fcnt\u00fclemek istiyor musunuz? UNION operat\u00f6r\u00fc, farkl\u0131 tablolar\u0131n veya sorgular\u0131n sonu\u00e7 k\u00fcmelerini tek bir sonu\u00e7 k\u00fcmesinde birle\u015ftirmenize olanak tan\u0131r. Ancak, varsay\u0131lan olarak UNION, sonu\u00e7lar\u0131 belirli bir s\u0131rada s\u0131ralamaz. Bu makalede, PostgreSQL’de UNION sonu\u00e7lar\u0131n\u0131 \u00f6zelle\u015ftirilmi\u015f bir s\u0131ralama ile nas\u0131l kullanaca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m \u00f6\u011frenece\u011fiz. Farkl\u0131 karma\u015f\u0131kl\u0131k seviyelerine uygun \u00f6rnekler ve performans optimizasyonu ipu\u00e7lar\u0131 sunaca\u011f\u0131z.<\/p>\n

\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n

Yeni Ba\u015flayan:<\/strong> Basit bir UNION sorgusu ve ORDER BY kullan\u0131m\u0131 ile ba\u015flayaca\u011f\u0131z.<\/p>\n

Orta Seviye:<\/strong> Ger\u00e7ek hayat senaryolar\u0131na dayal\u0131 \u00f6rnekler ve optimizasyon tekniklerini ele alaca\u011f\u0131z.<\/p>\n

\u0130leri Seviye:<\/strong> Performans analizi, karma\u015f\u0131k sorgular ve potansiyel sorunlar hakk\u0131nda detayl\u0131 bilgi verece\u011fiz.<\/p>\n

1. Temel Kavramlar: UNION ve ORDER BY<\/strong><\/p>\n

PostgreSQL’de UNION<\/code> operat\u00f6r\u00fc, iki veya daha fazla SELECT<\/code> sorgusunun sonu\u00e7 k\u00fcmelerini tek bir sonu\u00e7 k\u00fcmesinde birle\u015ftirir. UNION ALL<\/code> ise yinelenen sat\u0131rlar\u0131 da korurken, UNION<\/code> yinelenen sat\u0131rlar\u0131 otomatik olarak kald\u0131r\u0131r. Sonu\u00e7 k\u00fcmesini s\u0131ralamak i\u00e7in ORDER BY<\/code> kullan\u0131r\u0131z. ORDER BY<\/code> deyimi, sonu\u00e7 k\u00fcmesinin belirli bir veya birden fazla s\u00fctundaki de\u011ferlerine g\u00f6re s\u0131ralanmas\u0131n\u0131 sa\u011flar.<\/p>\n

2. UNION ile Basit S\u0131ralama: Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n

\u0130ki basit tabloyla ba\u015flayal\u0131m: urunler<\/code> ve kategoriler<\/code>. urunler<\/code> tablosunda \u00fcr\u00fcn ad\u0131 ve kategorisi, kategoriler<\/code> tablosunda kategori ad\u0131 ve a\u00e7\u0131klamas\u0131 bulunmaktad\u0131r. Bu iki tablodaki verileri birle\u015ftirmek ve kategori ad\u0131na g\u00f6re s\u0131ralamak istiyoruz.<\/p>\n

Kod:<\/strong><\/p>\n

SELECT urun_adi, kategori_adi\nFROM urunler\nUNION\nSELECT NULL, kategori_adi\nFROM kategoriler\nORDER BY kategori_adi;<\/code><\/pre>\n
Bu sorgu, \u00f6nce urunler<\/code> tablosundan urun_adi<\/code> ve kategori_adi<\/code> s\u00fctunlar\u0131n\u0131 se\u00e7er, ard\u0131ndan kategoriler<\/code> tablosundan sadece kategori_adi<\/code> s\u00fctununu se\u00e7er (ve urun_adi<\/code> i\u00e7in NULL<\/code> de\u011feri atar).  UNION<\/code> operat\u00f6r\u00fc bu iki sonu\u00e7 k\u00fcmesini birle\u015ftirir ve ORDER BY kategori_adi<\/code> deyimi, birle\u015fik sonu\u00e7 k\u00fcmesini kategori ad\u0131na g\u00f6re s\u0131ralar.<\/p>\n
3.  Ger\u00e7ek Hayat Senaryosu: \u00dcr\u00fcn ve Stok Bilgilerinin Birle\u015ftirilmesi (Orta Seviye)<\/strong><\/p>\n
Bir e-ticaret sitesi i\u00e7in \u00fcr\u00fcn bilgilerini ve stok bilgilerini i\u00e7eren iki tablo oldu\u011funu d\u00fc\u015f\u00fcnelim: urunler<\/code> ve stoklar<\/code>.  urunler<\/code> tablosunda \u00fcr\u00fcn ad\u0131, fiyat\u0131 ve kategori bilgisi bulunurken, stoklar<\/code> tablosunda \u00fcr\u00fcn kodu, stok adedi ve depo bilgisi bulunur.  Bu iki tablodaki verileri birle\u015ftirerek, \u00fcr\u00fcn ad\u0131, fiyat\u0131, stok adedi ve depo bilgisini i\u00e7eren bir rapor olu\u015fturmak istiyoruz.<\/p>\n
Kod:<\/strong><\/p>\n
SELECT u.urun_adi, u.fiyat, s.stok_adedi, s.depo\nFROM urunler u\nJOIN stoklar s ON u.urun_kodu = s.urun_kodu\nUNION\nSELECT u.urun_adi, u.fiyat, 0, 'Yok'\nFROM urunler u\nWHERE u.urun_kodu NOT IN (SELECT urun_kodu FROM stoklar)\nORDER BY u.urun_adi;<\/code><\/pre>\n
Bu sorgu, \u00f6nce urunler<\/code> ve stoklar<\/code> tablolar\u0131n\u0131 urun_kodu<\/code> s\u00fctununa g\u00f6re birle\u015ftirir.  Daha sonra, stok bilgisi olmayan \u00fcr\u00fcnleri de UNION<\/code> ile ekler (stok adedi 0 ve depo bilgisi ‘Yok’ olarak atan\u0131r). Son olarak, sonu\u00e7lar \u00fcr\u00fcn ad\u0131na g\u00f6re s\u0131ralan\u0131r.  Bu \u00f6rnek, ger\u00e7ek d\u00fcnya verilerinin nas\u0131l birle\u015ftirilebilece\u011fini ve eksik verilerin nas\u0131l ele al\u0131nabilece\u011fini g\u00f6sterir.<\/p>\n
4.  Performans Optimizasyonu \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n
UNION sorgular\u0131n\u0131n performans\u0131n\u0131 art\u0131rmak i\u00e7in birka\u00e7 ipucu:<\/p>\n
* \u0130ndeksler:<\/strong>  S\u0131k kullan\u0131lan s\u00fctunlara indeks eklemek sorgunun h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir, \u00f6zellikle ORDER BY<\/code> kullan\u0131yorsan\u0131z.
\n* UNION ALL:<\/strong>  E\u011fer yinelenen sat\u0131rlar \u00f6nemli de\u011filse, UNION ALL<\/code> kullanmak UNION<\/code>‘a g\u00f6re daha h\u0131zl\u0131d\u0131r \u00e7\u00fcnk\u00fc yinelenen sat\u0131rlar\u0131 kontrol etmez.
\n* Alt Sorgular\u0131 Optimize Etmek:<\/strong>  UNION<\/code> i\u00e7inde kullan\u0131lan alt sorgular\u0131 optimize etmek genel performans\u0131 iyile\u015ftirir.  Gerekti\u011finde EXISTS<\/code> veya IN<\/code> yerine JOIN<\/code> kullanmay\u0131 deneyin.
\n* WHERE ko\u015fullar\u0131:<\/strong>  UNION<\/code> \u00f6ncesinde her SELECT<\/code> sorgusunda WHERE<\/code> ko\u015fullar\u0131 kullanarak, i\u015flenecek veri miktar\u0131n\u0131 azaltabilirsiniz.<\/p>\n
5.  Karma\u015f\u0131k Sorgular ve Edge Case’ler (\u0130leri Seviye)<\/strong><\/p>\n
Birden fazla tablo ve karma\u015f\u0131k WHERE<\/code> ko\u015fullar\u0131n\u0131 i\u00e7eren UNION sorgular\u0131nda, performans sorunlar\u0131 ya\u015fanabilir.  Bu durumlarda, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 analiz etmek ve gerekli optimizasyonlar\u0131 yapmak \u00f6nemlidir.  EXPLAIN ANALYZE<\/code> komutu, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 ve s\u00fcresini g\u00f6sterir.<\/p>\n
6.  Performans Analizi ve EXPLAIN ANALYZE (\u0130leri Seviye)<\/strong><\/p>\n
Karma\u015f\u0131k bir UNION sorgusunun performans\u0131n\u0131 analiz etmek i\u00e7in EXPLAIN ANALYZE<\/code> kullanabiliriz.  Bu komut, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 ve her ad\u0131m\u0131n ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc g\u00f6sterir.  Bu bilgi, performans\u0131 iyile\u015ftirmek i\u00e7in hangi ad\u0131mlar\u0131n optimize edilmesi gerekti\u011fini belirlememize yard\u0131mc\u0131 olur. \u00d6rnek:<\/p>\n
EXPLAIN ANALYZE\nSELECT ... -- Karma\u015f\u0131k UNION sorgunuz<\/code><\/pre>\n
7.  PostgreSQL’de UNION Kullan\u0131m\u0131nda S\u0131k\u00e7a Sorulan Sorular (SSS)<\/strong><\/p>\n
* UNION ve UNION ALL aras\u0131ndaki fark nedir?<\/strong> UNION<\/code>, yinelenen sat\u0131rlar\u0131 kald\u0131r\u0131rken UNION ALL<\/code> kald\u0131rmaz.  UNION ALL<\/code> genellikle daha h\u0131zl\u0131d\u0131r.
\n* UNION sorgular\u0131nda ORDER BY nas\u0131l kullan\u0131l\u0131r?<\/strong> UNION<\/code> sorgusunun sonuna ORDER BY<\/code> deyimi eklenir.
\n* UNION sorgular\u0131n\u0131 optimize etmenin yollar\u0131 nelerdir?<\/strong> \u0130ndeksler kullan\u0131n, UNION ALL<\/code>‘\u0131 tercih edin, alt sorgular\u0131 optimize edin, WHERE<\/code> ko\u015fullar\u0131 kullan\u0131n ve EXPLAIN ANALYZE<\/code> ile performans\u0131 analiz edin.
\n* UNION ile \u00e7ok b\u00fcy\u00fck tablolar\u0131 birle\u015ftirmek performans\u0131 nas\u0131l etkiler?<\/strong> \u00c7ok b\u00fcy\u00fck tablolar i\u00e7in performans sorunlar\u0131 ya\u015fanabilir.  Bu durumda, partizyonlama veya materyalize g\u00f6r\u00fcn\u00fcmler gibi teknikler kullan\u0131labilir.
\n* UNION’da farkl\u0131 say\u0131da s\u00fctundan olu\u015fan sorgular\u0131 birle\u015ftirebilir miyim?<\/strong> Evet, ancak eksik s\u00fctunlar i\u00e7in NULL<\/code> de\u011ferleri atan\u0131r.<\/p>\n
8.  Sonu\u00e7<\/strong><\/p>\n
Bu makalede, PostgreSQL’de UNION operat\u00f6r\u00fcn\u00fc kullanarak sonu\u00e7 k\u00fcmelerini nas\u0131l birle\u015ftirece\u011finizi ve ORDER BY<\/code> ile nas\u0131l \u00f6zelle\u015ftirilmi\u015f bir s\u0131ralama olu\u015fturaca\u011f\u0131n\u0131z\u0131 \u00f6\u011frendiniz.  Farkl\u0131 karma\u015f\u0131kl\u0131k seviyelerindeki \u00f6rnekler ve performans optimizasyonu ipu\u00e7lar\u0131 ile, UNION sorgular\u0131n\u0131 etkili bir \u015fekilde kullanabilirsiniz.  Daha fazla PostgreSQL ipucu ve \u00f6\u011fretici i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com) adresini ziyaret edebilirsiniz.<\/p>\n
Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL’de UNION Sonu\u00e7lar\u0131n\u0131 \u00d6zel S\u0131rada Nas\u0131l Kullan\u0131r\u0131m? PostgreSQL veritaban\u0131n\u0131zda birden fazla sorgunun sonu\u00e7lar\u0131n\u0131 birle\u015ftirmek ve bunlar\u0131 istedi\u011finiz…","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-25440","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-postgresql","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nPostgreSQL: UNION Sonu\u00e7lar\u0131nda \u00d6zel S\u0131ralama Nas\u0131l Kullan\u0131l\u0131r<\/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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