{"id":27339,"date":"2025-08-11T18:15:23","date_gmt":"2025-08-11T15:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-birden-cok-sutunda-minimum-degeri-bulma\/"},"modified":"2025-08-11T18:15:23","modified_gmt":"2025-08-11T15:15:23","slug":"postgresql-birden-cok-sutunda-minimum-degeri-bulma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-birden-cok-sutunda-minimum-degeri-bulma\/","title":{"rendered":"PostgreSQL: Birden \u00c7ok S\u00fctunda Minimum De\u011feri Bulma"},"content":{"rendered":"<p># PostgreSQL&#8217;de Birden Fazla S\u00fctun \u0130\u00e7inde Minimum De\u011feri Bulma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda birden fazla s\u00fctun aras\u0131nda en k\u00fc\u00e7\u00fck de\u011feri bulman\u0131z m\u0131 gerekiyor?  \u00d6rne\u011fin, bir e-ticaret sitesindeki \u00fcr\u00fcnlerin farkl\u0131 tedarik\u00e7ilerden gelen fiyatlar\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131rarak en d\u00fc\u015f\u00fck fiyat\u0131 m\u0131 tespit etmek istiyorsunuz?  Ya da bir hava durumu uygulamas\u0131nda, bir \u015fehir i\u00e7in farkl\u0131 istasyonlardan gelen s\u0131cakl\u0131k verileri aras\u0131nda en d\u00fc\u015f\u00fck s\u0131cakl\u0131\u011f\u0131 m\u0131 bulman\u0131z gerekiyor?  Bu makale, PostgreSQL&#8217;de bu sorunu \u00e7\u00f6zmek i\u00e7in ad\u0131m ad\u0131m bir rehber sunuyor ve farkl\u0131 senaryolar i\u00e7in pratik \u00e7\u00f6z\u00fcmler \u00f6neriyor.  Amac\u0131m\u0131z, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi ve uygulayabilece\u011fi bir yakla\u015f\u0131m sergilemek.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de birden fazla s\u00fctun aras\u0131nda minimum de\u011feri bulma konusunda \u00fc\u00e7 farkl\u0131 seviyedeki bilgiyi kapsamaktad\u0131r:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  Temel SQL komutlar\u0131 ve basit bir \u00f6rnek \u00fczerinden ad\u0131m ad\u0131m a\u00e7\u0131klama.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat senaryolar\u0131, verimlili\u011fi art\u0131r\u0131c\u0131 ipu\u00e7lar\u0131 ve daha karma\u015f\u0131k sorgu \u00f6rnekleri.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, s\u0131n\u0131r durumlar\u0131 (edge cases) ve optimizasyon teknikleri.<\/p>\n<p><strong>PostgreSQL&#8217;de Minimum De\u011fer Nas\u0131l Bulunur? Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL&#8217;de birden fazla s\u00fctun aras\u0131nda minimum de\u011feri bulmak i\u00e7in <code class=\"language-\">LEAST()<\/code> fonksiyonunu kullanabiliriz.  <code class=\"language-\">LEAST()<\/code> fonksiyonu, kendisine verilen de\u011ferler aras\u0131nda en k\u00fc\u00e7\u00fck olan\u0131 d\u00f6nd\u00fcr\u00fcr.  Bu fonksiyon, say\u0131sal de\u011ferler, tarih ve zaman de\u011ferleri ve metin de\u011ferleri i\u00e7in kullan\u0131labilir.  Ancak, farkl\u0131 veri tiplerini ayn\u0131 <code class=\"language-\">LEAST()<\/code> fonksiyonu i\u00e7inde kar\u0131\u015ft\u0131ramazs\u0131n\u0131z.  \u00d6rne\u011fin, say\u0131sal bir de\u011fer ile metin de\u011ferini ayn\u0131 <code class=\"language-\">LEAST()<\/code> fonksiyonunda kullanamazs\u0131n\u0131z.  Bu durumda hata al\u0131rs\u0131n\u0131z.<\/p>\n<p>\u00d6rne\u011fin, <code class=\"language-\">fiyat1<\/code>, <code class=\"language-\">fiyat2<\/code> ve <code class=\"language-\">fiyat3<\/code> ad\u0131nda \u00fc\u00e7 fiyat s\u00fctununuz oldu\u011funu varsayal\u0131m.  Bu \u00fc\u00e7 s\u00fctun aras\u0131nda en d\u00fc\u015f\u00fck fiyat\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT LEAST(fiyat1, fiyat2, fiyat3) AS en_dusuk_fiyat\nFROM urunler;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">urunler<\/code> tablosundaki her sat\u0131r i\u00e7in <code class=\"language-\">fiyat1<\/code>, <code class=\"language-\">fiyat2<\/code> ve <code class=\"language-\">fiyat3<\/code> s\u00fctunlar\u0131 aras\u0131nda en d\u00fc\u015f\u00fck fiyat\u0131 hesaplar ve <code class=\"language-\">en_dusuk_fiyat<\/code> adl\u0131 bir s\u00fctun alt\u0131nda sonucu d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Birden Fazla S\u00fctun \u0130\u00e7in Minimum De\u011feri Bulma: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek d\u00fcnya senaryolar\u0131na daha yak\u0131n \u00f6rneklerle ilerleyelim.  Bir kitap\u00e7\u0131da farkl\u0131 tedarik\u00e7ilerden gelen ayn\u0131 kitab\u0131n fiyatlar\u0131n\u0131 tutan bir tablo d\u00fc\u015f\u00fcnelim.<\/p>\n<p><strong>Tablo Yap\u0131s\u0131:<\/strong><\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE kitaplar (\n    kitap_id SERIAL PRIMARY KEY,\n    kitap_adi VARCHAR(255),\n    tedarikci1_fiyat NUMERIC,\n    tedarikci2_fiyat NUMERIC,\n    tedarikci3_fiyat NUMERIC\n);<\/code><\/pre>\n<p><strong>Veri Giri\u015fi:<\/strong><\/p>\n<pre class=\"language-sql\"><code>INSERT INTO kitaplar (kitap_adi, tedarikci1_fiyat, tedarikci2_fiyat, tedarikci3_fiyat) VALUES\n('Y\u00fcz\u00fcklerin Efendisi', 50.00, 45.00, 55.00),\n('Harry Potter', 30.00, 32.00, 28.00),\n('Hobbit', 40.00, 38.00, 42.00);<\/code><\/pre>\n<p><strong>En D\u00fc\u015f\u00fck Fiyat\u0131 Bulma:<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki sorgu, her kitab\u0131n en d\u00fc\u015f\u00fck fiyat\u0131n\u0131 bulmam\u0131z\u0131 sa\u011flar:<\/p>\n<pre class=\"language-sql\"><code>SELECT kitap_adi, LEAST(tedarikci1_fiyat, tedarikci2_fiyat, tedarikci3_fiyat) AS en_dusuk_fiyat\nFROM kitaplar;<\/code><\/pre>\n<p>Bu sorgu, her kitab\u0131n ad\u0131n\u0131 ve en d\u00fc\u015f\u00fck fiyat\u0131n\u0131 g\u00f6steren bir sonu\u00e7 k\u00fcmesi d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>\u00c7ok Say\u0131da S\u00fctun \u0130\u00e7in Daha Verimli Bir \u00c7\u00f6z\u00fcm: CASE WHEN Kullan\u0131m\u0131<\/strong><\/p>\n<p>E\u011fer \u00e7ok say\u0131da tedarik\u00e7i fiyat\u0131n\u0131z varsa, <code class=\"language-\">LEAST<\/code> fonksiyonunu kullanmak biraz hantal olabilir.  Bu durumda, <code class=\"language-\">CASE WHEN<\/code> ifadesini kullanarak daha temiz ve okunabilir bir \u00e7\u00f6z\u00fcm \u00fcretebiliriz. Ancak bu y\u00f6ntem, s\u00fctun say\u0131s\u0131 artt\u0131k\u00e7a daha karma\u015f\u0131k hale gelir ve <code class=\"language-\">LEAST<\/code> fonksiyonuna g\u00f6re performans kayb\u0131na neden olabilir.  Bu y\u00fczden s\u00fctun say\u0131s\u0131 fazla oldu\u011funda daha geli\u015fmi\u015f teknikleri kullanmak daha mant\u0131kl\u0131d\u0131r.<\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi: E-Ticaret Fiyat Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/strong><\/p>\n<p>Bir e-ticaret sitesi, farkl\u0131 sat\u0131c\u0131lardan ayn\u0131 \u00fcr\u00fcn\u00fc listeler. Her sat\u0131c\u0131n\u0131n fiyat\u0131 farkl\u0131 bir s\u00fctunda tutulur.  Bu durumda, her \u00fcr\u00fcn i\u00e7in en d\u00fc\u015f\u00fck fiyat\u0131 bulmak i\u00e7in <code class=\"language-\">LEAST()<\/code> fonksiyonunu veya <code class=\"language-\">CASE WHEN<\/code> ifadesini kullanabiliriz.  Bu, m\u00fc\u015fterilere en iyi fiyat\u0131 sunmak i\u00e7in \u00f6nemlidir.  Ayr\u0131ca, stok y\u00f6netimi i\u00e7in de kullan\u0131\u015fl\u0131d\u0131r; \u00f6rne\u011fin, en d\u00fc\u015f\u00fck fiyatl\u0131 sat\u0131c\u0131dan \u00f6ncelikle \u00fcr\u00fcn tedarik edilebilir.<\/p>\n<p><strong>Performans Optimizasyonu: \u0130ndeks Kullan\u0131m\u0131<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck bir tabloda \u00e7al\u0131\u015f\u0131yorsan\u0131z, performans\u0131 art\u0131rmak i\u00e7in indeks kullanman\u0131z \u00f6nemlidir.  Fiyat s\u00fctunlar\u0131na indeks eklemek, <code class=\"language-\">LEAST()<\/code> fonksiyonunun \u00e7al\u0131\u015fmas\u0131n\u0131 h\u0131zland\u0131rabilir.  \u0130ndeks eklemek i\u00e7in a\u015fa\u011f\u0131daki komutu kullanabilirsiniz (\u00f6rnek olarak <code class=\"language-\">tedarikci1_fiyat<\/code> s\u00fctununa):<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX idx_tedarikci1_fiyat ON kitaplar (tedarikci1_fiyat);<\/code><\/pre>\n<p>Benzer \u015fekilde, di\u011fer fiyat s\u00fctunlar\u0131na da indeks ekleyebilirsiniz. Ancak, indekslerin gereksiz yere olu\u015fturulmas\u0131 performans\u0131 olumsuz etkileyebilir.  \u0130ndeks olu\u015fturmadan \u00f6nce, sorgular\u0131n\u0131z\u0131n performans\u0131n\u0131 analiz etmeli ve indekslerin ger\u00e7ekten gerekli olup olmad\u0131\u011f\u0131n\u0131 belirlemelisiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler:  Pivot Tablolar ve CTE&#8217;ler (Common Table Expressions)<\/strong><\/p>\n<p>\u00c7ok say\u0131da s\u00fctununuz varsa, verileri daha y\u00f6netilebilir bir hale getirmek i\u00e7in pivot tablolar veya CTE&#8217;ler kullanabilirsiniz.  Pivot tablolar, s\u00fctunlar\u0131 sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrerek daha kolay bir analiz sa\u011flar.  CTE&#8217;ler ise karma\u015f\u0131k sorgular\u0131 daha okunabilir ve y\u00f6netilebilir par\u00e7alara ay\u0131rman\u0131za yard\u0131mc\u0131 olur.<\/p>\n<p>\u00d6rne\u011fin, her sat\u0131c\u0131n\u0131n fiyatlar\u0131n\u0131 ayr\u0131 sat\u0131rlarda g\u00f6steren bir pivot tablo olu\u015fturabilir ve ard\u0131ndan bu tabloda minimum fiyat\u0131 bulabilirsiniz.  Bu, \u00f6zellikle \u00e7ok say\u0131da sat\u0131c\u0131n\u0131z oldu\u011funda daha temiz ve verimli bir yakla\u015f\u0131m olabilir.  [fatihsoysal.com](https:\/\/fatihsoysal.com) sitesindeki PostgreSQL ile ilgili makalelerde bu konular detayl\u0131 olarak ele al\u0131nmaktad\u0131r.<\/p>\n<p><strong>S\u0131n\u0131r Durumlar\u0131 (Edge Cases) ve Hata Y\u00f6netimi<\/strong><\/p>\n<p><code class=\"language-\">NULL<\/code> de\u011ferler ile \u00e7al\u0131\u015f\u0131rken dikkatli olmak gerekir.  <code class=\"language-\">LEAST()<\/code> fonksiyonu, bir veya daha fazla <code class=\"language-\">NULL<\/code> de\u011fer i\u00e7eren bir girdi ald\u0131\u011f\u0131nda <code class=\"language-\">NULL<\/code> d\u00f6nd\u00fcr\u00fcr.  Bu durumu y\u00f6netmek i\u00e7in <code class=\"language-\">COALESCE()<\/code> fonksiyonunu kullanabilirsiniz.  <code class=\"language-\">COALESCE()<\/code> fonksiyonu, ilk <code class=\"language-\">NULL<\/code> olmayan de\u011feri d\u00f6nd\u00fcr\u00fcr.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>SELECT kitap_adi, COALESCE(LEAST(tedarikci1_fiyat, tedarikci2_fiyat, tedarikci3_fiyat), 0) AS en_dusuk_fiyat\nFROM kitaplar;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">NULL<\/code> de\u011ferler varsa 0 de\u011ferini kullan\u0131r.  Alternatif olarak, <code class=\"language-\">NULL<\/code> de\u011ferleri farkl\u0131 bir de\u011ferle (\u00f6rne\u011fin, maksimum fiyat) de\u011fi\u015ftirebilir veya bunlar\u0131 sorgu sonu\u00e7lar\u0131ndan tamamen \u00e7\u0131karabilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de birden fazla s\u00fctun aras\u0131nda minimum de\u011feri bulmak i\u00e7in <code class=\"language-\">LEAST()<\/code> fonksiyonu ve <code class=\"language-\">CASE WHEN<\/code> ifadesi etkili y\u00f6ntemlerdir.  Veri setinizin b\u00fcy\u00fckl\u00fc\u011f\u00fcne ve karma\u015f\u0131kl\u0131\u011f\u0131n\u0131za ba\u011fl\u0131 olarak, performans optimizasyonu i\u00e7in indeksler, pivot tablolar ve CTE&#8217;ler kullanman\u0131z gerekebilir.  <code class=\"language-\">NULL<\/code> de\u011ferleri ve di\u011fer s\u0131n\u0131r durumlar\u0131n\u0131 do\u011fru bir \u015fekilde ele almak da \u00f6nemlidir.  Bu makalede anlat\u0131lan y\u00f6ntemler, farkl\u0131 senaryolara uygulanabilir ve PostgreSQL veritaban\u0131n\u0131zda daha etkili sorgulamalar yapman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">LEAST()<\/code> fonksiyonu farkl\u0131 veri tipleriyle \u00e7al\u0131\u015fabilir mi?<\/strong> Hay\u0131r, ayn\u0131 <code class=\"language-\">LEAST()<\/code> fonksiyonu i\u00e7inde farkl\u0131 veri tipleri kullanamazs\u0131n\u0131z.<br \/>\n2. <strong>\u00c7ok say\u0131da s\u00fctun i\u00e7in <code class=\"language-\">LEAST()<\/code> fonksiyonu kullanman\u0131n performans etkisi nedir?<\/strong> \u00c7ok say\u0131da s\u00fctun i\u00e7in <code class=\"language-\">LEAST()<\/code> fonksiyonu kullanmak performans sorunlar\u0131na yol a\u00e7abilir. Bu durumda <code class=\"language-\">CASE WHEN<\/code> veya daha geli\u015fmi\u015f teknikler tercih edilmelidir.<br \/>\n3. <strong><code class=\"language-\">NULL<\/code> de\u011ferlerini nas\u0131l ele alabilirim?<\/strong> <code class=\"language-\">COALESCE()<\/code> fonksiyonunu kullanarak <code class=\"language-\">NULL<\/code> de\u011ferleri yerine bir varsay\u0131lan de\u011fer atayabilirsiniz.<br \/>\n4. <strong>Performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong> \u0130ndeksler olu\u015fturarak, sorgular\u0131 optimize ederek ve CTE&#8217;ler kullanarak performans\u0131 iyile\u015ftirebilirsiniz.<br \/>\n5. <strong>Pivot tablolar ne zaman kullan\u0131\u015fl\u0131d\u0131r?<\/strong> \u00c7ok say\u0131da s\u00fctununuz varsa ve bunlar\u0131 sat\u0131rlara d\u00f6n\u00fc\u015ft\u00fcrerek daha kolay analiz etmek istiyorsan\u0131z pivot tablolar kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Birden Fazla S\u00fctun \u0130\u00e7inde Minimum De\u011feri Bulma PostgreSQL veritaban\u0131n\u0131zda birden fazla s\u00fctun aras\u0131nda en k\u00fc\u00e7\u00fck de\u011feri&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-27339","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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