{"id":8470,"date":"2025-01-03T04:45:13","date_gmt":"2025-01-03T01:45:13","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/"},"modified":"2025-01-03T04:45:13","modified_gmt":"2025-01-03T01:45:13","slug":"alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/","title":{"rendered":"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7"},"content":{"rendered":"<p>Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7<\/p>\n<p>Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m.  Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r.  Bu sayede karma\u015f\u0131k veritaban\u0131 i\u015flemlerini daha d\u00fczenli ve anla\u015f\u0131l\u0131r bir \u015fekilde ger\u00e7ekle\u015ftirebilirsiniz.  \u00d6ncelikle, alt sorgular\u0131n ne oldu\u011funu ve neden kullan\u0131ld\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayarak ba\u015flayal\u0131m.<\/p>\n<h2>Alt Sorgular (Subqueries) Nedir ve Neden Kullan\u0131l\u0131r?<\/h2>\n<p>Basit\u00e7e ifade edersek, bir alt sorgu, bir ana sorgu i\u00e7erisinde yer alan ve belirli bir sonucu d\u00f6nd\u00fcren ba\u011f\u0131ms\u0131z bir SQL sorgusudur.  Bu sonu\u00e7, ana sorgu taraf\u0131ndan kullan\u0131larak daha karma\u015f\u0131k ko\u015fullar olu\u015fturulur.  \u00d6rne\u011fin, belirli bir \u015fart\u0131 sa\u011flayan kay\u0131tlar\u0131 se\u00e7mek veya belirli bir de\u011ferin var olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in alt sorgular kullan\u0131labilir.  K\u0131sacas\u0131, alt sorgular, veritaban\u0131ndan karma\u015f\u0131k bilgi \u00e7\u0131karmak i\u00e7in inan\u0131lmaz derecede g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Sonu\u00e7 olarak, daha etkili ve verimli sorgulamalar yazman\u0131za yard\u0131mc\u0131 olurlar.<\/p>\n<p>Alt sorgular\u0131n bir\u00e7ok avantaj\u0131 vard\u0131r.  \u00d6rne\u011fin, karma\u015f\u0131k ko\u015fullar\u0131 daha okunabilir ve anla\u015f\u0131l\u0131r hale getirirler.  Ayr\u0131ca, veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc koruyarak daha g\u00fcvenilir sonu\u00e7lar elde etmenizi sa\u011flarlar.  Bunun yan\u0131nda, kod tekrar\u0131n\u0131 azaltarak daha temiz ve daha bak\u0131m\u0131 kolay sorgular yazman\u0131za olanak tan\u0131rlar.  Hatta, baz\u0131 durumlarda performans\u0131 art\u0131rabilirler.<\/p>\n<h2>Alt Sorgular\u0131n \u00c7e\u015fitleri<\/h2>\n<p>Alt sorgular, bulunduklar\u0131 yere ve nas\u0131l kullan\u0131ld\u0131klar\u0131na g\u00f6re farkl\u0131 t\u00fcrlere ayr\u0131l\u0131r.  En yayg\u0131n kullan\u0131lan t\u00fcrleri \u015fu \u015fekilde s\u0131ralayabiliriz:<\/p>\n<ul>\n<li><b>WHERE i\u00e7inde kullan\u0131lan alt sorgular:<\/b> Ana sorgunun WHERE ko\u015fulunda kullan\u0131lan alt sorgular, belirli bir \u015fart\u0131 sa\u011flayan kay\u0131tlar\u0131 filtrelemek i\u00e7in kullan\u0131l\u0131r. \u00d6rne\u011fin, ortalama maa\u015ftan daha fazla maa\u015f alan \u00e7al\u0131\u015fanlar\u0131 bulmak i\u00e7in kullan\u0131labilirler.<\/li>\n<li><b>FROM i\u00e7inde kullan\u0131lan alt sorgular:<\/b> Ana sorgunun FROM b\u00f6l\u00fcm\u00fcnde kullan\u0131lan alt sorgular, bir alt sorgu sonucunda olu\u015fturulan ge\u00e7ici bir tablo gibi davran\u0131r. Bu ge\u00e7ici tablo daha sonra ana sorgu taraf\u0131ndan sorgulan\u0131r.<\/li>\n<li><b>SELECT i\u00e7inde kullan\u0131lan alt sorgular:<\/b>  Ana sorgunun SELECT b\u00f6l\u00fcm\u00fcnde kullan\u0131lan alt sorgular, her sat\u0131r i\u00e7in farkl\u0131 bir de\u011fer d\u00f6nd\u00fcr\u00fcr. Bu de\u011ferler, ana sorgunun sonu\u00e7lar\u0131na eklenir.<\/li>\n<li><b>HAVING i\u00e7inde kullan\u0131lan alt sorgular:<\/b>  Gruplanm\u0131\u015f verileri filtrelemek i\u00e7in HAVING deyimi ile birlikte kullan\u0131l\u0131rlar. \u00d6rne\u011fin, belirli bir ortalamaya sahip gruplar\u0131 se\u00e7mek i\u00e7in kullan\u0131labilir.<\/li>\n<\/ul>\n<h2>Alt Sorgular ile Pratik \u00d6rnekler<\/h2>\n<p>\u015eimdi, alt sorgular\u0131n kullan\u0131m\u0131n\u0131 birka\u00e7 pratik \u00f6rnek ile daha iyi anlayal\u0131m.  A\u015fa\u011f\u0131daki \u00f6rneklerde,  MySQL kullan\u0131lm\u0131\u015ft\u0131r.  Ancak, temel prensipler di\u011fer veritaban\u0131 sistemlerinde de benzerdir.<\/p>\n<p><code><br \/>\nSELECT * FROM Urunler WHERE fiyat > (SELECT AVG(fiyat) FROM Urunler);<br \/>\n<\/code><\/p>\n<p>Bu sorgu, \u00fcr\u00fcnlerin ortalama fiyat\u0131ndan daha pahal\u0131 olan \u00fcr\u00fcnleri getirir.  Burada, i\u00e7teki sorgu ortalama fiyat\u0131 hesaplar ve d\u0131\u015ftaki sorgu bu de\u011feri kullanarak filtreleme yapar.<\/p>\n<p><code><br \/>\nSELECT siparis_no, (SELECT SUM(miktar*fiyat) FROM siparis_detaylar WHERE siparis_detaylar.siparis_no = siparisler.siparis_no) AS toplam_fiyat FROM siparisler;<br \/>\n<\/code><\/p>\n<p>Bu sorgu ise her sipari\u015fin toplam fiyat\u0131n\u0131 hesaplar.  \u0130\u00e7teki sorgu her sipari\u015f i\u00e7in ayr\u0131 ayr\u0131 toplam fiyat\u0131 hesaplar ve d\u0131\u015ftaki sorgu bunu sipari\u015f numaras\u0131 ile birlikte g\u00f6r\u00fcnt\u00fcler. <\/p>\n<h2>Performans Optimizasyonu<\/h2>\n<p>Alt sorgular kullan\u0131rken, performans optimizasyonuna dikkat etmek \u00f6nemlidir.  \u00c7ok karma\u015f\u0131k veya b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015fan alt sorgular, sorgu s\u00fcresini uzatabilir.  Bu gibi durumlarda, alt sorgular yerine JOIN i\u015flemleri kullanmak daha verimli olabilir.  Ayr\u0131ca, indeksleme ve do\u011fru veri t\u00fcrleri kullanarak performans\u0131 iyile\u015ftirebilirsiniz.  <a href=\"https:\/\/fatihsoysal.com\">Sitemi<\/a> ziyaret ederek veritaban\u0131 performans\u0131 ile ilgili daha fazla bilgiye ula\u015fabilirsiniz.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Alt sorgular, veritaban\u0131 sorgulamalar\u0131nda g\u00fc\u00e7l\u00fc ve esnek bir ara\u00e7t\u0131r.  Karma\u015f\u0131k sorgulamalar\u0131 daha okunabilir ve y\u00f6netilebilir hale getirirler.  Ancak, performans optimizasyonuna dikkat edilmesi gerekir.  Uygun \u015fekilde kullan\u0131ld\u0131\u011f\u0131nda, alt sorgular veritaban\u0131 i\u015flemlerinizde b\u00fcy\u00fck kolayl\u0131k sa\u011flayacakt\u0131r.  Umar\u0131m bu makale, alt sorgular\u0131 anlaman\u0131za ve kullanman\u0131za yard\u0131mc\u0131 olmu\u015ftur.<\/p>\n<p>Daha fazla bilgi i\u00e7in a\u015fa\u011f\u0131daki kaynaklar\u0131 inceleyebilirsiniz:<\/p>\n<ul>\n<li><a href=\"https:\/\/dev.to\/ricardomtt\/subqueries-kcm\">Subqueries (\u0130ngilizce)<\/a><\/li>\n<li><a href=\"https:\/\/www.w3schools.com\/sql\/sql_subqueries.asp\">W3Schools Subqueries (\u0130ngilizce)<\/a><\/li>\n<\/ul>\n<h3>#Etiketler<\/h3>\n<p>Alt Sorgular, Subqueries, SQL, Veritaban\u0131, Sorgu, Performans Optimizasyonu, MySQL, Veri Taban\u0131 Sorgulama Teknikleri,  JOIN,  Veritaban\u0131 Y\u00f6netimi<\/p>\n","protected":false},"excerpt":{"rendered":"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7 Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc&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-8470","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>Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7<\/title>\n<meta name=\"description\" content=\"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m. Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. Bu sayede karma\u015f\u0131k veritaban\u0131 i\u015flemlerini daha d\u00fczenli ve anla\u015f\u0131l\u0131r bir \u015fekilde ger\u00e7ekle\u015ftirebilirsiniz. \u00d6ncelikle, alt sorgular\u0131n ne oldu\u011funu ve neden kullan\u0131ld\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayarak ba\u015flayal\u0131m.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7\" \/>\n<meta property=\"og:description\" content=\"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m. Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. Bu sayede karma\u015f\u0131k veritaban\u0131 i\u015flemlerini daha d\u00fczenli ve anla\u015f\u0131l\u0131r bir \u015fekilde ger\u00e7ekle\u015ftirebilirsiniz. \u00d6ncelikle, alt sorgular\u0131n ne oldu\u011funu ve neden kullan\u0131ld\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayarak ba\u015flayal\u0131m.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-01-03T01:45:13+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7\",\"datePublished\":\"2025-01-03T01:45:13+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\"},\"wordCount\":748,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/\",\"name\":\"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-01-03T01:45:13+00:00\",\"description\":\"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m. Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. 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Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m. Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. Bu sayede karma\u015f\u0131k veritaban\u0131 i\u015flemlerini daha d\u00fczenli ve anla\u015f\u0131l\u0131r bir \u015fekilde ger\u00e7ekle\u015ftirebilirsiniz. \u00d6ncelikle, alt sorgular\u0131n ne oldu\u011funu ve neden kullan\u0131ld\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayarak ba\u015flayal\u0131m.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/","og_locale":"tr_TR","og_type":"article","og_title":"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7","og_description":"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlerle veritaban\u0131 sorgulamalar\u0131nda olduk\u00e7a g\u00fc\u00e7l\u00fc ve kullan\u0131\u015fl\u0131 bir teknik olan alt sorgular (subqueries) hakk\u0131nda detayl\u0131 bir makale payla\u015faca\u011f\u0131m. Alt sorgular, ana sorgu i\u00e7inde yer alan ve kendi ba\u015f\u0131na bir sorgu gibi \u00e7al\u0131\u015fan ba\u011f\u0131ms\u0131z sorgulamalard\u0131r. Bu sayede karma\u015f\u0131k veritaban\u0131 i\u015flemlerini daha d\u00fczenli ve anla\u015f\u0131l\u0131r bir \u015fekilde ger\u00e7ekle\u015ftirebilirsiniz. \u00d6ncelikle, alt sorgular\u0131n ne oldu\u011funu ve neden kullan\u0131ld\u0131\u011f\u0131n\u0131 a\u00e7\u0131klayarak ba\u015flayal\u0131m.","og_url":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/","og_site_name":"Kodlar\u0131n Gizemli D\u00fcnyas\u0131","article_published_time":"2025-01-03T01:45:13+00:00","author":"Fatih Soysal","twitter_card":"summary_large_image","twitter_misc":{"Yazan:":"Fatih Soysal","Tahmini okuma s\u00fcresi":"4 dakika"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/#article","isPartOf":{"@id":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/"},"author":{"name":"Fatih Soysal","@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1"},"headline":"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7","datePublished":"2025-01-03T01:45:13+00:00","mainEntityOfPage":{"@id":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/"},"wordCount":748,"commentCount":0,"publisher":{"@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1"},"inLanguage":"tr","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/#respond"]}],"copyrightYear":"2025","copyrightHolder":{"@id":"https:\/\/fatihsoysal.com\/blog\/#organization"}},{"@type":"WebPage","@id":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/","url":"https:\/\/fatihsoysal.com\/blog\/alt-sorgular-subqueries-veritabani-sorgulamalarinda-guclu-bir-arac\/","name":"Alt Sorgular (Subqueries): Veritaban\u0131 Sorgulamalar\u0131nda G\u00fc\u00e7l\u00fc Bir Ara\u00e7","isPartOf":{"@id":"https:\/\/fatihsoysal.com\/blog\/#website"},"datePublished":"2025-01-03T01:45:13+00:00","description":"Merhaba! 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