{"id":29162,"date":"2025-09-08T16:30:23","date_gmt":"2025-09-08T13:30:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/veritabani-sorgulamalarinda-alt-sorgular-cteler-ve-sakli-yordamlar\/"},"modified":"2025-09-08T16:30:23","modified_gmt":"2025-09-08T13:30:23","slug":"veritabani-sorgulamalarinda-alt-sorgular-cteler-ve-sakli-yordamlar","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/veritabani-sorgulamalarinda-alt-sorgular-cteler-ve-sakli-yordamlar\/","title":{"rendered":"Veritaban\u0131 Sorgulamalar\u0131nda Alt Sorgular, CTE&#8217;ler ve Sakl\u0131 Yordamlar"},"content":{"rendered":"<p>Veritaban\u0131 Sorgulamalar\u0131nda Alt Sorgular, CTE&#8217;ler ve Sakl\u0131 Yordamlar<\/p>\n<p>Veritaban\u0131 y\u00f6netim sistemlerinde (DBMS) verimli ve etkili sorgulamalar yapmak i\u00e7in \u00e7e\u015fitli teknikler kullan\u0131l\u0131r. Alt sorgular, ortak tablo ifadeleri (CTE&#8217;ler) ve sakl\u0131 yordamlar, karma\u015f\u0131k veri i\u015flemlerini basitle\u015ftirmek ve performans\u0131 optimize etmek i\u00e7in kullan\u0131lan \u00f6nemli ara\u00e7lard\u0131r. Ancak, her birinin kendine \u00f6zg\u00fc avantajlar\u0131 ve dezavantajlar\u0131 vard\u0131r. Bu makalede, bu \u00fc\u00e7 teknik aras\u0131ndaki farklar\u0131 detayl\u0131 bir \u015fekilde ele alacak, ger\u00e7ek d\u00fcnya senaryolar\u0131 ile destekleyecek ve hangisinin hangi durumda kullan\u0131laca\u011f\u0131na dair rehberlik sa\u011flayaca\u011f\u0131z.  Daha fazla bilgi i\u00e7in Fatih Soysal&#8217;\u0131n web sitesini (https:\/\/fatihsoysal.com) ziyaret edebilirsiniz.<\/p>\n<h2>Alt Sorgular (Subqueries) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?<\/h2>\n<p>Alt sorgular, bir SQL sorgusunun i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu olan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. Ana sorguda kullan\u0131lan verileri sa\u011flamak veya ko\u015fullar\u0131 belirlemek i\u00e7in kullan\u0131l\u0131rlar.  Alt sorgular, <code>SELECT<\/code>, <code>FROM<\/code>, <code>WHERE<\/code>, ve <code>HAVING<\/code> gibi bir\u00e7ok SQL c\u00fcmleci\u011finde yer alabilir. \u00d6rne\u011fin, bir m\u00fc\u015fterinin sipari\u015f tarihini bulmak i\u00e7in, m\u00fc\u015fteri kimli\u011fini i\u00e7eren bir alt sorgu kullanabiliriz.  Bu, daha b\u00fcy\u00fck bir tablodan ilgili bilgileri filtrelemek i\u00e7in olduk\u00e7a verimli bir yoldur.  Ancak, karma\u015f\u0131k alt sorgular, okunabilirli\u011fi ve performans\u0131 olumsuz etkileyebilir.  \u00d6zellikle \u00e7ok say\u0131da i\u00e7 i\u00e7e ge\u00e7mi\u015f alt sorgu,  veritaban\u0131 performans\u0131n\u0131 d\u00fc\u015f\u00fcrebilir.  Bu nedenle, alt sorgular\u0131n say\u0131s\u0131n\u0131 ve karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 m\u00fcmk\u00fcn oldu\u011funca azaltmak \u00f6nemlidir.<\/p>\n<h3>Alt Sorgular\u0131n Avantajlar\u0131 ve Dezavantajlar\u0131 Nelerdir?<\/h3>\n<p>Alt sorgular\u0131n avantajlar\u0131, basit sorgu yap\u0131lar\u0131nda okunabilirli\u011fi ve anla\u015f\u0131l\u0131rl\u0131\u011f\u0131 art\u0131rmas\u0131d\u0131r.  Karma\u015f\u0131k ko\u015fullar\u0131n daha d\u00fczenli ve par\u00e7al\u0131 olarak ifade edilmesini sa\u011flarlar. Dezavantajlar\u0131 ise, \u00e7ok say\u0131da i\u00e7 i\u00e7e ge\u00e7mi\u015f alt sorgu, sorgunun anla\u015f\u0131lmas\u0131n\u0131 zorla\u015ft\u0131rabilir ve performans sorunlar\u0131na yol a\u00e7abilir.  Ayr\u0131ca, \u00f6zellikle b\u00fcy\u00fck veritabanlar\u0131nda, performans a\u00e7\u0131s\u0131ndan daha yava\u015f \u00e7al\u0131\u015fabilirler.  Bu nedenle, karma\u015f\u0131k sorgular i\u00e7in CTE&#8217;ler veya sakl\u0131 yordamlar daha uygun olabilir.<\/p>\n<h3>Ger\u00e7ek D\u00fcnya Senaryosu: En \u00c7ok Sipari\u015f Veren M\u00fc\u015fteriyi Bulma<\/h3>\n<p>\u00d6rne\u011fin, en \u00e7ok sipari\u015f veren m\u00fc\u015fteriyi bulmak i\u00e7in a\u015fa\u011f\u0131daki gibi bir alt sorgu kullanabiliriz:<\/p>\n<pre><code class=\"language-sql\">SELECT customer_id, customer_name\nFROM Customers\nWHERE customer_id = (SELECT customer_id FROM Orders GROUP BY customer_id ORDER BY COUNT(*) DESC LIMIT 1);<\/pre>\n<p><\/code><\/p>\n<p>Bu sorgu, \u00f6nce <code>Orders<\/code> tablosunda her m\u00fc\u015fteri i\u00e7in sipari\u015f say\u0131s\u0131n\u0131 hesaplar, ard\u0131ndan en y\u00fcksek sipari\u015f say\u0131s\u0131na sahip m\u00fc\u015fteri kimli\u011fini bulur ve son olarak bu kimli\u011fe sahip m\u00fc\u015fteri bilgilerini <code>Customers<\/code> tablosundan \u00e7eker.  Burada alt sorgu, ana sorgunun <code>WHERE<\/code> c\u00fcmleci\u011finde kullan\u0131lm\u0131\u015ft\u0131r.<\/p>\n<h2>Ortak Tablo \u0130fadeleri (CTE'ler) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?<\/h2>\n<p>Ortak Tablo \u0130fadeleri (CTE'ler), ge\u00e7ici isimli bir sorgu sonucunu temsil eden ve daha sonra ana sorgu i\u00e7inde tekrar kullan\u0131labilen bir yap\u0131d\u0131r.  CTE'ler, karma\u015f\u0131k sorgular\u0131 daha okunabilir ve y\u00f6netilebilir hale getirmek i\u00e7in kullan\u0131l\u0131r.  Alt sorgulara benzer \u015fekilde, karma\u015f\u0131k veri i\u015fleme i\u015flemlerini par\u00e7alara ay\u0131rmak ve daha anla\u015f\u0131l\u0131r bir yap\u0131 olu\u015fturmak i\u00e7in idealdir. Bir CTE, bir <code>WITH<\/code> c\u00fcmleci\u011fi ile tan\u0131mlan\u0131r ve ard\u0131ndan ana sorgu i\u00e7inde referans verilir.  CTE'ler yaln\u0131zca tan\u0131mland\u0131klar\u0131 sorgunun y\u00fcr\u00fct\u00fclmesi s\u00fcresince ge\u00e7erlidir; ge\u00e7ici bir yap\u0131d\u0131rlar.<\/p>\n<h3>CTE'lerin Avantajlar\u0131 ve Dezavantajlar\u0131 Nelerdir?<\/h3>\n<p>CTE'lerin en b\u00fcy\u00fck avantaj\u0131, okunabilirli\u011fi ve s\u00fcrd\u00fcr\u00fclebilirli\u011fi art\u0131rmalar\u0131d\u0131r. Karma\u015f\u0131k sorgular\u0131 daha k\u00fc\u00e7\u00fck, daha y\u00f6netilebilir par\u00e7alara ay\u0131r\u0131rlar.  Bu, kodun anla\u015f\u0131lmas\u0131n\u0131 ve hatalar\u0131n d\u00fczeltilmesini kolayla\u015ft\u0131r\u0131r.  Ancak, \u00e7ok karma\u015f\u0131k CTE'ler de okunabilirli\u011fi olumsuz etkileyebilir.  Performans a\u00e7\u0131s\u0131ndan, do\u011fru \u015fekilde kullan\u0131ld\u0131\u011f\u0131nda alt sorgulara g\u00f6re daha verimli olabilirler, \u00e7\u00fcnk\u00fc veritaban\u0131 y\u00f6netim sistemi CTE'yi bir kez hesaplar ve daha sonra referans ald\u0131\u011f\u0131nda tekrar hesaplamaz.<\/p>\n<h3>Ger\u00e7ek D\u00fcnya Senaryosu:  \u00dcr\u00fcn Kategorilerine G\u00f6re Toplam Sat\u0131\u015flar\u0131 Hesaplama<\/h3>\n<p>\u00d6rne\u011fin, \u00fcr\u00fcn kategorilerine g\u00f6re toplam sat\u0131\u015flar\u0131 hesaplamak i\u00e7in bir CTE kullanabiliriz:<\/p>\n<pre><code class=\"language-sql\">WITH ProductSales AS (\n    SELECT product_category, SUM(sales_amount) AS total_sales\n    FROM Sales\n    GROUP BY product_category\n)\nSELECT product_category, total_sales\nFROM ProductSales\nORDER BY total_sales DESC;<\/pre>\n<p><\/code><\/p>\n<p>Bu \u00f6rnekte, <code>ProductSales<\/code> CTE'si, her \u00fcr\u00fcn kategorisi i\u00e7in toplam sat\u0131\u015flar\u0131 hesaplar.  Ana sorgu daha sonra bu CTE'den sonu\u00e7lar\u0131 al\u0131r ve s\u0131ralar. Bu, alt sorgu kullanmaktan daha okunabilir ve anla\u015f\u0131l\u0131r bir yap\u0131 sa\u011flar.<\/p>\n<h2>Sakl\u0131 Yordamlar (Stored Procedures) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?<\/h2>\n<p>Sakl\u0131 yordamlar, \u00f6nceden derlenmi\u015f ve veritaban\u0131nda saklanan bir dizi SQL ifadesidir.  Tek bir \u00e7a\u011fr\u0131yla, birden \u00e7ok SQL ifadesini \u00e7al\u0131\u015ft\u0131rmak i\u00e7in kullan\u0131labilirler.  Bu, uygulamalar\u0131n veritaban\u0131yla etkile\u015fimini basitle\u015ftirir ve performans\u0131 art\u0131r\u0131r.  Bir sakl\u0131 yorduam,  parametreler alabilir ve sonu\u00e7lar d\u00f6nd\u00fcrebilir.  Sakl\u0131 yordamlar, g\u00fcvenli\u011fi art\u0131rmak i\u00e7in de kullan\u0131l\u0131r, \u00e7\u00fcnk\u00fc do\u011frudan SQL komutlar\u0131 yerine yordam \u00e7a\u011fr\u0131s\u0131 yap\u0131l\u0131r. Bu, yetkisiz eri\u015fimi \u00f6nlemeye yard\u0131mc\u0131 olur.<\/p>\n<h3>Sakl\u0131 Yordamlar\u0131n Avantajlar\u0131 ve Dezavantajlar\u0131 Nelerdir?<\/h3>\n<p>Sakl\u0131 yordamlar\u0131n en b\u00fcy\u00fck avantajlar\u0131, performans art\u0131\u015f\u0131 ve g\u00fcvenliktir.  \u00d6nceden derlenmi\u015f olduklar\u0131 i\u00e7in her \u00e7a\u011fr\u0131da yeniden derlenmezler, bu da i\u015flem h\u0131z\u0131n\u0131 art\u0131r\u0131r.  Ayr\u0131ca,  g\u00fcvenlik a\u00e7\u0131s\u0131ndan, kullan\u0131c\u0131lar\u0131n veritaban\u0131na do\u011frudan eri\u015fimini k\u0131s\u0131tlayarak SQL enjeksiyonuna kar\u015f\u0131 koruma sa\u011flarlar.  Dezavantajlar\u0131 ise,  karma\u015f\u0131k sakl\u0131 yordamlar\u0131n yaz\u0131lmas\u0131 ve bak\u0131m\u0131 zor olabilir.  Ayr\u0131ca,  hata ay\u0131klama da daha zor olabilir.  E\u011fer yordam yanl\u0131\u015fl\u0131kla b\u00fcy\u00fck bir veri setinde \u00e7al\u0131\u015ft\u0131r\u0131l\u0131rsa, ciddi performans sorunlar\u0131na neden olabilir.<\/p>\n<h3>Ger\u00e7ek D\u00fcnya Senaryosu: Yeni M\u00fc\u015fteri Kayd\u0131<\/h3>\n<p>\u00d6rne\u011fin, yeni bir m\u00fc\u015fteri kaydetmek i\u00e7in bir sakl\u0131 yordam kullanabiliriz:<\/p>\n<pre><code class=\"language-sql\">CREATE PROCEDURE AddNewCustomer (\n    @customer_name VARCHAR(255),\n    @customer_email VARCHAR(255)\n)\nAS\nBEGIN\n    INSERT INTO Customers (customer_name, customer_email)\n    VALUES (@customer_name, @customer_email);\nEND;<\/pre>\n<p><\/code><\/p>\n<p>Bu yordam, yeni bir m\u00fc\u015fteri kayd\u0131 eklemek i\u00e7in kullan\u0131l\u0131r.  Parametreler alarak, veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve g\u00fcvenli\u011fini sa\u011flar.  Uygulamalar bu yordam\u0131 \u00e7a\u011f\u0131rmak suretiyle, yeni m\u00fc\u015fterileri ekleyebilir.<\/p>\n<h2>Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131: Alt Sorgular, CTE'ler ve Sakl\u0131 Yordamlar<\/h2>\n<p>| Teknik         | Okunabilirlik | Performans       | G\u00fcvenlik | Karma\u015f\u0131kl\u0131k |<br \/>\n|-----------------|-----------------|-------------------|----------|--------------|<br \/>\n| Alt Sorgular    | Orta           | Orta             | D\u00fc\u015f\u00fck     | D\u00fc\u015f\u00fck - Orta |<br \/>\n| CTE'ler         | Y\u00fcksek          | Y\u00fcksek            | Orta      | Orta         |<br \/>\n| Sakl\u0131 Yordamlar | Orta - D\u00fc\u015f\u00fck    | Y\u00fcksek            | Y\u00fcksek    | Y\u00fcksek       |<\/p>\n<p>Yukar\u0131daki tabloda g\u00f6r\u00fcld\u00fc\u011f\u00fc gibi, her bir yakla\u015f\u0131m\u0131n farkl\u0131 performans ve g\u00fcvenlik \u00f6zelliklerine sahiptir.  Se\u00e7eneklerin do\u011fru \u015fekilde se\u00e7ilmesi, uygulaman\u0131n performans\u0131 ve g\u00fcvenli\u011fi a\u00e7\u0131s\u0131ndan olduk\u00e7a \u00f6nemlidir.<\/p>\n<h2>\u00d6\u011frenme Yol Haritas\u0131<\/h2>\n<h3>Yeni Ba\u015flayanlar<\/h3>\n<p>Yeni ba\u015flayanlar i\u00e7in \u00f6ncelikle temel SQL syntax'\u0131n\u0131 \u00f6\u011frenmek \u00f6nemlidir. Alt sorgular ile ba\u015flamak, temel SQL konseptlerini peki\u015ftirmek i\u00e7in iyi bir yoldur. Basit alt sorgular ile pratik yaparak, CTE'ler ve sakl\u0131 yordamlar i\u00e7in sa\u011flam bir temel olu\u015fturabilirsiniz.<\/p>\n<h3>Orta Seviye<\/h3>\n<p>Orta seviyedeki kullan\u0131c\u0131lar, daha karma\u015f\u0131k alt sorgular ve CTE'ler kullanarak, veri i\u015flemlerini daha verimli hale getirebilirler.  Farkl\u0131 tablolar\u0131 birle\u015ftirme ve veri filtreleme gibi geli\u015fmi\u015f teknikleri \u00f6\u011frenerek, daha g\u00fc\u00e7l\u00fc ve \u00f6zelle\u015ftirilmi\u015f sorgular yazabilirler.  Basit sakl\u0131 yordamlar ile deneyim kazanarak, kodun yeniden kullan\u0131labilirli\u011fini ve performans\u0131n\u0131 art\u0131rabilirler.<\/p>\n<h3>\u0130leri Seviye<\/h3>\n<p>\u0130leri seviye kullan\u0131c\u0131lar,  karma\u015f\u0131k CTE'ler ve i\u00e7 i\u00e7e ge\u00e7mi\u015f alt sorgular kullanarak, \u00e7ok b\u00fcy\u00fck veri setlerindeki i\u015flemleri optimize edebilirler.  Performans sorunlar\u0131n\u0131 gidermek ve daha verimli sorgular yazmak i\u00e7in, farkl\u0131 indeksleme ve optimizasyon tekniklerini \u00f6\u011frenmelidirler.  Karma\u015f\u0131k sakl\u0131 yordamlar, hata y\u00f6netimi ve parametre i\u015fleme gibi geli\u015fmi\u015f konular\u0131 kapsaml\u0131 bir \u015fekilde anlamal\u0131d\u0131rlar.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Alt sorgular, CTE'ler ve sakl\u0131 yordamlar, veritaban\u0131 i\u015flemlerinde farkl\u0131 ihtiya\u00e7lar i\u00e7in kullan\u0131labilen g\u00fc\u00e7l\u00fc ara\u00e7lard\u0131r.  Alt sorgular basit sorgular i\u00e7in idealdirken, CTE'ler karma\u015f\u0131k sorgular\u0131 daha okunabilir ve y\u00f6netilebilir hale getirir. Sakl\u0131 yordamlar ise performans\u0131 ve g\u00fcvenli\u011fi art\u0131rmak i\u00e7in kullan\u0131l\u0131r.  Do\u011fru yakla\u015f\u0131m\u0131 se\u00e7mek, uygulaman\u0131n performans\u0131 ve s\u00fcrd\u00fcr\u00fclebilirli\u011fi i\u00e7in \u00e7ok \u00f6nemlidir.  Uygulama ihtiya\u00e7lar\u0131na en uygun tekni\u011fi se\u00e7mek, deneyim ve pratik gerektirir.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ul>\n<li><strong>CTE'ler ve alt sorgular aras\u0131ndaki temel fark nedir?<\/strong> CTE'ler, adland\u0131r\u0131lm\u0131\u015f ve tekrar kullan\u0131labilir ge\u00e7ici sorgulard\u0131r, alt sorgular ise yaln\u0131zca bir kez kullan\u0131l\u0131r.<\/li>\n<li><strong>Sakl\u0131 yordamlar neden performans\u0131 art\u0131r\u0131r?<\/strong> Sakl\u0131 yordamlar \u00f6nceden derlenir, bu y\u00fczden her \u00e7a\u011fr\u0131da yeniden derlenmezler.<\/li>\n<li><strong>Hangi durumda hangi tekni\u011fi kullanmal\u0131y\u0131m?<\/strong> Basit sorgular i\u00e7in alt sorgular, karma\u015f\u0131k sorgular i\u00e7in CTE'ler ve tekrarlanan i\u015flemler i\u00e7in sakl\u0131 yordamlar en uygunudur.<\/li>\n<li><strong>\u00c7ok say\u0131da i\u00e7 i\u00e7e ge\u00e7mi\u015f alt sorgu kullanman\u0131n sak\u0131ncalar\u0131 nelerdir?<\/strong> Performans d\u00fc\u015f\u00fc\u015f\u00fcne ve okunabilirlik sorunlar\u0131na neden olabilir.<\/li>\n<li><strong>Sakl\u0131 yordamlar\u0131n g\u00fcvenlik avantajlar\u0131 nelerdir?<\/strong> Do\u011frudan SQL komutlar\u0131na g\u00f6re daha fazla g\u00fcvenlik sa\u011flar, SQL enjeksiyonuna kar\u015f\u0131 koruma sa\u011flar.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"Veritaban\u0131 Sorgulamalar\u0131nda Alt Sorgular, CTE&#8217;ler ve Sakl\u0131 Yordamlar Veritaban\u0131 y\u00f6netim sistemlerinde (DBMS) verimli ve etkili sorgulamalar yapmak i\u00e7in&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":[1],"tags":[],"class_list":{"0":"post-29162","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Veritaban\u0131 Sorgulamalar\u0131nda Alt Sorgular, CTE&#039;ler ve Sakl\u0131 Yordamlar<\/title>\n<meta name=\"description\" content=\"Veritaban\u0131 y\u00f6netim sistemlerinde (DBMS) verimli ve etkili sorgulamalar yapmak i\u00e7in \u00e7e\u015fitli teknikler kullan\u0131l\u0131r. Alt sorgular, ortak tablo ifadeleri (CTE&#039;ler) ve sakl\u0131 yordamlar, karma\u015f\u0131k veri i\u015flemlerini basitle\u015ftirmek ve performans\u0131 optimize etmek i\u00e7in kullan\u0131lan \u00f6nemli ara\u00e7lard\u0131r. Ancak, her birinin kendine \u00f6zg\u00fc avantajlar\u0131 ve dezavantajlar\u0131 vard\u0131r. Bu makalede, bu \u00fc\u00e7 teknik aras\u0131ndaki farklar\u0131 detayl\u0131 bir \u015fekilde ele alacak, ger\u00e7ek d\u00fcnya senaryolar\u0131 ile destekleyecek ve hangisinin hangi durumda kullan\u0131laca\u011f\u0131na dair rehberlik sa\u011flayaca\u011f\u0131z. 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