{"id":25650,"date":"2025-07-10T15:15:42","date_gmt":"2025-07-10T12:15:42","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-inner-join-ve-group-by-kullanimi\/"},"modified":"2025-07-10T15:15:42","modified_gmt":"2025-07-10T12:15:42","slug":"postgresql-inner-join-ve-group-by-kullanimi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-inner-join-ve-group-by-kullanimi\/","title":{"rendered":"PostgreSQL: INNER JOIN ve GROUP BY Kullan\u0131m\u0131"},"content":{"rendered":"<p># PostgreSQL: INNER JOIN ve GROUP BY Kullan\u0131m\u0131<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda birden fazla tablodan veri \u00e7ekerken ve bu verileri \u00f6zetlemek isterken, <code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code> maddeleri olmazsa olmazlar\u0131n\u0131zd\u0131r.  Bu makalede, bu iki g\u00fc\u00e7l\u00fc SQL komutunun nas\u0131l kullan\u0131laca\u011f\u0131n\u0131, performanslar\u0131n\u0131 nas\u0131l optimize edece\u011finizi ve ger\u00e7ek d\u00fcnya senaryolar\u0131nda nas\u0131l uygulayaca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m \u00f6\u011freneceksiniz.  Veri analizi ve raporlamada s\u0131k\u00e7a kar\u015f\u0131la\u015faca\u011f\u0131n\u0131z karma\u015f\u0131k sorgulamalar\u0131 kolayca olu\u015fturmay\u0131 \u00f6\u011frenecek, PostgreSQL yeteneklerinizi bir \u00fcst seviyeye ta\u015f\u0131yacaks\u0131n\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code> temel kavramlar\u0131, basit \u00f6rnekler ve ad\u0131m ad\u0131m a\u00e7\u0131klamalar.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, karma\u015f\u0131k sorgulamalar, performans optimizasyon ipu\u00e7lar\u0131 ve indeks kullan\u0131m\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, <code class=\"language-\">GROUP BY<\/code> ile birlikte kullan\u0131lan fonksiyonlar (\u00f6rne\u011fin, <code class=\"language-\">SUM<\/code>, <code class=\"language-\">AVG<\/code>, <code class=\"language-\">COUNT<\/code>), edge case&#8217;ler ve olas\u0131 sorunlar\u0131n \u00e7\u00f6z\u00fcmleri.<\/p>\n<p><strong>PostgreSQL&#8217;de INNER JOIN Nedir?<\/strong><\/p>\n<p><code class=\"language-\">INNER JOIN<\/code>, iki veya daha fazla tabloyu ortak s\u00fctunlar\u0131 temel alarak birle\u015ftirmenizi sa\u011flar. Sadece ortak s\u00fctunlarda e\u015fle\u015fen sat\u0131rlar sonuca dahil edilir.  Di\u011fer bir deyi\u015fle, bir tabloda bulunan ancak di\u011ferinde bulunmayan veriler sonu\u00e7 k\u00fcmesinde g\u00f6r\u00fcnmez.  Bu, verilerinizin sadece ilgili k\u0131s\u0131mlar\u0131n\u0131 birle\u015ftirmenize olanak tan\u0131r.<\/p>\n<p><strong>\u00d6rnek:<\/strong>  <code class=\"language-\">urunler<\/code> ve <code class=\"language-\">kategoriler<\/code> adl\u0131 iki tablomuz olsun. <code class=\"language-\">urunler<\/code> tablosunda <code class=\"language-\">urun_id<\/code>, <code class=\"language-\">urun_adi<\/code>, <code class=\"language-\">kategori_id<\/code> ve <code class=\"language-\">fiyat<\/code> s\u00fctunlar\u0131, <code class=\"language-\">kategoriler<\/code> tablosunda ise <code class=\"language-\">kategori_id<\/code> ve <code class=\"language-\">kategori_adi<\/code> s\u00fctunlar\u0131 bulunsun.  Bu iki tabloyu <code class=\"language-\">kategori_id<\/code> s\u00fctununa g\u00f6re birle\u015ftirmek i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT u.urun_adi, k.kategori_adi, u.fiyat\nFROM urunler u\nINNER JOIN kategoriler k ON u.kategori_id = k.kategori_id;<\/code><\/pre>\n<p>Bu sorgu, her \u00fcr\u00fcn\u00fcn ad\u0131n\u0131, fiyat\u0131n\u0131 ve ait oldu\u011fu kategori ad\u0131n\u0131 getirecektir.<\/p>\n<p><strong>PostgreSQL&#8217;de GROUP BY Nedir?<\/strong><\/p>\n<p><code class=\"language-\">GROUP BY<\/code> maddesi, <code class=\"language-\">SELECT<\/code> sorgusunda belirtilen s\u00fctunlar\u0131 gruplayarak verileri \u00f6zetlemenizi sa\u011flar.  <code class=\"language-\">GROUP BY<\/code> ile birlikte genellikle toplama fonksiyonlar\u0131 (<code class=\"language-\">SUM<\/code>, <code class=\"language-\">AVG<\/code>, <code class=\"language-\">COUNT<\/code>, <code class=\"language-\">MAX<\/code>, <code class=\"language-\">MIN<\/code>) kullan\u0131l\u0131r.  Bu fonksiyonlar, her grup i\u00e7in bir toplam de\u011fer hesaplar.<\/p>\n<p><strong>\u00d6rnek:<\/strong>  Yukar\u0131daki <code class=\"language-\">urunler<\/code> ve <code class=\"language-\">kategoriler<\/code> tablolar\u0131n\u0131 kullanarak, her kategorideki \u00fcr\u00fcn say\u0131s\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT k.kategori_adi, COUNT(u.urun_id) AS urun_sayisi\nFROM urunler u\nINNER JOIN kategoriler k ON u.kategori_id = k.kategori_id\nGROUP BY k.kategori_adi;<\/code><\/pre>\n<p>Bu sorgu, her kategori ad\u0131 ve o kategoriye ait \u00fcr\u00fcn say\u0131s\u0131n\u0131 getirecektir.<\/p>\n<p><strong>INNER JOIN ve GROUP BY&#8217;\u0131 Birlikte Kullanmak: Uygulamal\u0131 K\u0131lavuz<\/strong><\/p>\n<p><code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code>&#8216;\u0131 birlikte kullanarak daha karma\u015f\u0131k verileri analiz edebiliriz.  \u00d6rne\u011fin, her kategorideki \u00fcr\u00fcnlerin ortalama fiyat\u0131n\u0131 bulmak isteyebiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT k.kategori_adi, AVG(u.fiyat) AS ortalama_fiyat\nFROM urunler u\nINNER JOIN kategoriler k ON u.kategori_id = k.kategori_id\nGROUP BY k.kategori_adi;<\/code><\/pre>\n<p>Bu sorgu, her kategori i\u00e7in ortalama \u00fcr\u00fcn fiyat\u0131n\u0131 hesaplar.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131 ve Vaka Analizleri<\/strong><\/p>\n<p><strong>Senaryo 1: E-ticaret Sitesi Raporlamas\u0131<\/strong><\/p>\n<p>Bir e-ticaret sitesinin sipari\u015f verilerini i\u00e7eren <code class=\"language-\">siparisler<\/code> ve <code class=\"language-\">musteriler<\/code> tablolar\u0131 oldu\u011funu d\u00fc\u015f\u00fcnelim.  Her sipari\u015fin m\u00fc\u015fteri ID&#8217;sini, sipari\u015f tarihini ve toplam tutar\u0131n\u0131 i\u00e7eren <code class=\"language-\">siparisler<\/code> tablosu ve her m\u00fc\u015fterinin ID&#8217;sini, ad\u0131n\u0131 ve adresini i\u00e7eren <code class=\"language-\">musteriler<\/code> tablosu.  Her m\u00fc\u015fterinin yapt\u0131\u011f\u0131 toplam sipari\u015f tutar\u0131n\u0131 bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT m.musteri_adi, SUM(s.toplam_tutar) AS toplam_siparis_tutari\nFROM siparisler s\nINNER JOIN musteriler m ON s.musteri_id = m.musteri_id\nGROUP BY m.musteri_adi;<\/code><\/pre>\n<p><strong>Senaryo 2: Sosyal Medya Analizi<\/strong><\/p>\n<p>Bir sosyal medya platformunun kullan\u0131c\u0131 aktivitelerini i\u00e7eren <code class=\"language-\">paylasimlar<\/code> ve <code class=\"language-\">kullanicilar<\/code> tablolar\u0131 olsun. <code class=\"language-\">paylasimlar<\/code> tablosu her payla\u015f\u0131m\u0131n ID&#8217;sini, kullan\u0131c\u0131 ID&#8217;sini ve payla\u015f\u0131m tarihini i\u00e7erirken, <code class=\"language-\">kullanicilar<\/code> tablosu her kullan\u0131c\u0131n\u0131n ID&#8217;sini ve kullan\u0131c\u0131 ad\u0131n\u0131 i\u00e7erir. Her kullan\u0131c\u0131n\u0131n yapt\u0131\u011f\u0131 toplam payla\u015f\u0131m say\u0131s\u0131n\u0131 bulmak i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT k.kullanici_adi, COUNT(*) AS toplam_paylasim\nFROM paylasimlar p\nINNER JOIN kullanicilar k ON p.kullanici_id = k.kullanici_id\nGROUP BY k.kullanici_adi;<\/code><\/pre>\n<p><strong>Performans Optimizasyonu<\/strong><\/p>\n<p><code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code> sorgular\u0131n\u0131n performans\u0131n\u0131 art\u0131rmak i\u00e7in a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131n\u0131 kullanabilirsiniz:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code> i\u015flemlerinde kullan\u0131lan s\u00fctunlara indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* <strong>WHERE maddesi:<\/strong>  Gerekli verileri filtrelemek i\u00e7in <code class=\"language-\">WHERE<\/code> maddesini kullanarak, i\u015flem yap\u0131lacak veri miktar\u0131n\u0131 azaltabilirsiniz.<br \/>\n* <strong>Fonksiyonel indeksler:<\/strong>  Karma\u015f\u0131k sorgularda, fonksiyonel indeksler performans art\u0131\u015f\u0131 sa\u011flayabilir.<br \/>\n* <strong>Analiz:<\/strong>  <code class=\"language-\">ANALYZE<\/code> komutunu kullanarak veritaban\u0131 istatistiklerini g\u00fcncelleyerek sorgu optimizasyonunu iyile\u015ftirebilirsiniz.  Bu, PostgreSQL&#8217;in en iyi sorgu plan\u0131n\u0131 se\u00e7mesine yard\u0131mc\u0131 olur.<br \/>\n* <strong>EXPLAIN ANALYZE:<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgunuzun performans\u0131n\u0131 analiz edebilir ve hangi k\u0131s\u0131mlar\u0131n\u0131n optimize edilmesi gerekti\u011fini belirleyebilirsiniz.  Bu, \u00f6zellikle karma\u015f\u0131k sorgularda \u00e7ok faydal\u0131d\u0131r.  <code class=\"language-\">fatihsoysal.com<\/code> sitesinde bu konuda daha detayl\u0131 bilgi bulabilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Konular: Edge Case&#8217;ler ve Karma\u015f\u0131k Sorgulamalar<\/strong><\/p>\n<p><code class=\"language-\">GROUP BY<\/code> ile birlikte <code class=\"language-\">HAVING<\/code> maddesini kullanarak gruplar\u0131 filtreleyebilirsiniz.  \u00d6rne\u011fin, belirli bir say\u0131dan fazla \u00fcr\u00fcn\u00fc olan kategorileri listelemek i\u00e7in <code class=\"language-\">HAVING<\/code> kullanabilirsiniz.  Ayr\u0131ca, <code class=\"language-\">CASE<\/code> ifadeleri ve alt sorgular gibi daha geli\u015fmi\u015f teknikleri kullanarak daha karma\u015f\u0131k sorgulamalar olu\u015fturabilirsiniz.  <code class=\"language-\">fatihsoysal.com<\/code> adresinde bu konulara dair daha detayl\u0131 \u00f6rnekler ve a\u00e7\u0131klamalar bulabilirsiniz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p><code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">GROUP BY<\/code> maddeleri, PostgreSQL veritaban\u0131n\u0131zda g\u00fc\u00e7l\u00fc ve verimli sorgulamalar olu\u015fturman\u0131za olanak tan\u0131r.  Bu makalede \u00f6\u011frendi\u011finiz teknikleri kullanarak, verilerinizi analiz etmek ve raporlamak i\u00e7in daha etkili ve h\u0131zl\u0131 sorgular yazabilirsiniz.  Unutmay\u0131n ki performans optimizasyonu, b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken kritik \u00f6neme sahiptir.  \u0130ndeksleme, <code class=\"language-\">WHERE<\/code> maddesi kullan\u0131m\u0131 ve <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu, veritaban\u0131n\u0131z\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirebilir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">INNER JOIN<\/code> ve <code class=\"language-\">LEFT JOIN<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">INNER JOIN<\/code>, sadece iki tabloda ortak olan sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcrken, <code class=\"language-\">LEFT JOIN<\/code> sol tablodaki t\u00fcm sat\u0131rlar\u0131 ve sa\u011f tabloda e\u015fle\u015fen sat\u0131rlar\u0131 d\u00f6nd\u00fcr\u00fcr.  E\u015fle\u015fmeyen sat\u0131rlar i\u00e7in sa\u011f tablo s\u00fctunlar\u0131 <code class=\"language-\">NULL<\/code> de\u011ferine sahip olacakt\u0131r.<\/p>\n<p>2. <strong><code class=\"language-\">GROUP BY<\/code> maddesinde birden fazla s\u00fctun kullanabilir miyim?<\/strong> Evet, <code class=\"language-\">GROUP BY<\/code> maddesinde birden fazla s\u00fctunu virg\u00fclle ay\u0131rarak kullanabilirsiniz.  Bu, verileri birden fazla s\u00fctuna g\u00f6re grupland\u0131rman\u0131za olanak tan\u0131r.<\/p>\n<p>3. <strong><code class=\"language-\">GROUP BY<\/code> ile kullan\u0131labilen fonksiyonlar nelerdir?<\/strong>  <code class=\"language-\">SUM<\/code>, <code class=\"language-\">AVG<\/code>, <code class=\"language-\">COUNT<\/code>, <code class=\"language-\">MAX<\/code>, <code class=\"language-\">MIN<\/code>, <code class=\"language-\">FIRST<\/code>, <code class=\"language-\">LAST<\/code> gibi toplama fonksiyonlar\u0131 yayg\u0131n olarak kullan\u0131l\u0131r.<\/p>\n<p>4. <strong><code class=\"language-\">HAVING<\/code> maddesi ne i\u015fe yarar?<\/strong>  <code class=\"language-\">HAVING<\/code> maddesi, <code class=\"language-\">GROUP BY<\/code> ile olu\u015fturulan gruplar\u0131 filtrelemek i\u00e7in kullan\u0131l\u0131r.  <code class=\"language-\">WHERE<\/code> maddesi sat\u0131rlar\u0131 filtrelerken, <code class=\"language-\">HAVING<\/code> maddesi gruplar\u0131 filtreler.<\/p>\n<p>5. <strong>Performans sorunlar\u0131 ya\u015farsam ne yapmal\u0131y\u0131m?<\/strong>  \u00d6ncelikle <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgunuzun performans\u0131n\u0131 analiz edin.  Sonras\u0131nda indeksleme, <code class=\"language-\">WHERE<\/code> maddesi kullan\u0131m\u0131 ve sorgu optimizasyon tekniklerini uygulayarak performans\u0131 iyile\u015ftirmeyi deneyin.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL: INNER JOIN ve GROUP BY Kullan\u0131m\u0131 PostgreSQL veritaban\u0131n\u0131zda birden fazla tablodan veri \u00e7ekerken ve bu verileri&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-25650","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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