{"id":4188,"date":"2024-11-18T06:30:15","date_gmt":"2024-11-18T03:30:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/"},"modified":"2024-11-18T06:30:15","modified_gmt":"2024-11-18T03:30:15","slug":"satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/","title":{"rendered":"Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131"},"content":{"rendered":"<p>&#8220;`html<br \/>\nSat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131<\/p>\n<p>Merhaba! Fatih Soysal olarak, bug\u00fcn sizlere sat\u0131r tabanl\u0131 verilerde, belirli bir anahtar s\u00fctuna g\u00f6re yinelenen kay\u0131tlar\u0131n nas\u0131l say\u0131laca\u011f\u0131n\u0131 detayl\u0131 olarak a\u00e7\u0131klayaca\u011f\u0131m.  Bu i\u015flem, veri analizi ve veri temizleme s\u00fcre\u00e7lerinde olduk\u00e7a \u00f6nemlidir.  \u00d6rne\u011fin, bir m\u00fc\u015fteri veritaban\u0131nda ayn\u0131 m\u00fc\u015fteri i\u00e7in birden fazla kay\u0131t varsa, bu kay\u0131tlar\u0131n say\u0131s\u0131n\u0131 tespit ederek veri kalitesini iyile\u015ftirebilir ve gereksiz verilerden kurtulabiliriz.  Veri analizi, i\u015f kararlar\u0131n\u0131n kalitesini do\u011frudan etkiler.  Dolay\u0131s\u0131yla do\u011fru ve temiz verilerle \u00e7al\u0131\u015fmak \u015fartt\u0131r.  Bu nedenle, bu makalede ele alaca\u011f\u0131m\u0131z konu b\u00fcy\u00fck \u00f6nem ta\u015f\u0131maktad\u0131r.<\/p>\n<p>\u00d6ncelikle, farkl\u0131 programlama dilleri ve ara\u00e7lar\u0131 ile bu i\u015flemi nas\u0131l ger\u00e7ekle\u015ftirebilece\u011fimize bir bakal\u0131m.  Daha sonra, \u00e7e\u015fitli senaryolar ve \u00f6rneklerle konuyu daha iyi anlaman\u0131z\u0131 sa\u011flayaca\u011f\u0131m.  Ayr\u0131ca,  yinelenen verilerle nas\u0131l ba\u015fa \u00e7\u0131kabilece\u011fimiz ve veri temizleme stratejileri hakk\u0131nda da bilgiler payla\u015faca\u011f\u0131m.<\/p>\n<h2>Y\u00f6ntemler ve \u00d6rnekler<\/h2>\n<p>Yinelenen kay\u0131tlar\u0131 saymak i\u00e7in bir\u00e7ok y\u00f6ntem mevcuttur. Bunlardan en yayg\u0131n olanlar\u0131 \u015funlard\u0131r:<\/p>\n<ol>\n<li><strong>SQL kullan\u0131m\u0131:<\/strong>  SQL, veritabanlar\u0131nda veri manip\u00fclasyonu i\u00e7in g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Yinelenen kay\u0131tlar\u0131 saymak i\u00e7in `COUNT(*)` fonksiyonu ile `GROUP BY`  kullanabiliriz.  \u00d6rne\u011fin, &#8220;m\u00fc\u015fteri_id&#8221; s\u00fctununa g\u00f6re yinelenen kay\u0131tlar\u0131 saymak i\u00e7in a\u015fa\u011f\u0131daki SQL sorgusunu kullanabiliriz:<\/p>\n<pre><code>SELECT m\u00fc\u015fteri_id, COUNT(*) AS yinelenen_kayit_sayisi\nFROM m\u00fc\u015fteri_tablosu\nGROUP BY m\u00fc\u015fteri_id\nHAVING COUNT(*) > 1;<\/code><\/pre>\n<p>Bu sorgu, her m\u00fc\u015fteri i\u00e7in ka\u00e7 adet kay\u0131t oldu\u011funu g\u00f6sterir ve yinelenen kay\u0131t say\u0131s\u0131 1&#8217;den fazla olan m\u00fc\u015fterileri listeler.  Elbette, bu sorgudaki tablo ve s\u00fctun adlar\u0131n\u0131 kendi veritaban\u0131n\u0131za g\u00f6re de\u011fi\u015ftirmeniz gerekecektir.  Daha geli\u015fmi\u015f SQL teknikleri ile, yinelenen kay\u0131tlar\u0131 silme veya g\u00fcncelleme i\u015flemleri de yap\u0131labilir. Bunun i\u00e7in, <a href=\"https:\/\/fatihsoysal.com\">fatihsoysal.com<\/a> adresindeki di\u011fer makalelerime g\u00f6z atabilirsiniz.<\/p>\n<li><strong>Python kullan\u0131m\u0131:<\/strong> Python gibi programlama dilleri de bu i\u015flemi ger\u00e7ekle\u015ftirmek i\u00e7in kullan\u0131labilir.  Pandas k\u00fct\u00fcphanesi, veri manip\u00fclasyonu i\u00e7in olduk\u00e7a g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Pandas ile, verileri okuyup, gruplama yaparak yinelenen kay\u0131tlar\u0131 kolayca sayabiliriz.  \u0130\u015fte basit bir \u00f6rnek:<\/li>\n<pre><code class=\"language-python\">import pandas as pd\n\ndata = {'m\u00fc\u015fteri_id': [1, 1, 2, 3, 3, 3],\n        'ad': ['Ahmet', 'Ahmet', 'Mehmet', 'Ay\u015fe', 'Ay\u015fe', 'Ay\u015fe']}\ndf = pd.DataFrame(data)\nduplicates = df.groupby('m\u00fc\u015fteri_id').size().reset_index(name='counts')\nprint(duplicates[duplicates['counts'] > 1])<\/code><\/pre>\n<p>Bu kod blo\u011fu, m\u00fc\u015fteri ID&#8217;sine g\u00f6re grupland\u0131rma yapar ve her grubun boyutunu hesaplar.  Sonras\u0131nda, boyut 1&#8217;den b\u00fcy\u00fck olan gruplar\u0131 (yani yinelenen kay\u0131tlar\u0131) g\u00f6sterir.  Bu y\u00f6ntemin avantaj\u0131, veri analizi i\u00e7in daha fazla esneklik sa\u011flamas\u0131d\u0131r.<\/p>\n<li><strong>Excel kullan\u0131m\u0131:<\/strong>  Excel&#8217;de de benzer i\u015flemler yap\u0131labilir.  `COUNTIF` fonksiyonu ile belirli bir de\u011ferin ka\u00e7 kez tekrarland\u0131\u011f\u0131n\u0131 sayabiliriz. Ancak, b\u00fcy\u00fck veriler i\u00e7in Excel&#8217;in performans\u0131 d\u00fc\u015febilir. Daha b\u00fcy\u00fck veriler i\u00e7in veritaban\u0131 sistemleri ve programlama dilleri kullan\u0131lmas\u0131 \u00f6nerilir.<\/li>\n<\/ol>\n<h2>Veri Temizleme Stratejileri<\/h2>\n<p>Yinelenen kay\u0131tlar\u0131 sayd\u0131ktan sonra, bunlarla nas\u0131l ba\u015fa \u00e7\u0131kaca\u011f\u0131n\u0131z \u00f6nemlidir.  Baz\u0131 stratejiler \u015funlard\u0131r:<\/p>\n<ul>\n<li><strong>Silme:<\/strong> Yinelenen kay\u0131tlar\u0131n tamam\u0131n\u0131 silebilirsiniz. Bu, veritaban\u0131n\u0131z\u0131n boyutunu k\u00fc\u00e7\u00fclt\u00fcr ve performans\u0131 art\u0131r\u0131r. Ancak, \u00f6nemli bilgiler kaybedilebilece\u011finden dikkatli olunmal\u0131d\u0131r.<\/li>\n<li><strong>Birle\u015ftirme:<\/strong>  Yinelenen kay\u0131tlar\u0131 tek bir kay\u0131tta birle\u015ftirebilirsiniz.  \u00d6rne\u011fin, ayn\u0131 m\u00fc\u015fteri i\u00e7in birden fazla adres varsa, bu adresleri tek bir alana birle\u015ftirebilirsiniz.<\/li>\n<li><strong>\u0130\u015flem yapma:<\/strong>  Yinelenen kay\u0131tlara ek bilgiler ekleyerek (\u00f6rne\u011fin, kay\u0131t tarihi) bunlar\u0131 ay\u0131rt edebilirsiniz.<\/li>\n<\/ul>\n<p>Hangi stratejiyi kullanaca\u011f\u0131n\u0131z, verilerinizin yap\u0131s\u0131na ve amac\u0131n\u0131za ba\u011fl\u0131d\u0131r.  \u00d6nemli olan, veri temizli\u011fi s\u00fcrecini dikkatlice planlamak ve her ad\u0131m\u0131n olas\u0131 sonu\u00e7lar\u0131n\u0131 de\u011ferlendirmektir.<\/p>\n<p>Umar\u0131m bu makale, sat\u0131r tabanl\u0131 verilerde anahtar s\u00fctuna g\u00f6re yinelenen kay\u0131tlar\u0131n say\u0131m\u0131 konusunda size yard\u0131mc\u0131 olmu\u015ftur.  Daha fazla bilgi i\u00e7in,  <a href=\"https:\/\/fatihsoysal.com\">web sitemi<\/a> ziyaret edebilir ve di\u011fer makalelerimi inceleyebilirsiniz.  Ayr\u0131ca, konuyla ilgili sorular\u0131n\u0131z\u0131 yorumlar b\u00f6l\u00fcm\u00fcnde sorabilirsiniz.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/example.com\/grafik.png\" alt=\"Yinelenen Kay\u0131tlar Grafi\u011fi\"> <!-- Yer tutucu grafik ba\u011flant\u0131s\u0131 --><\/p>\n<p>#Etiketler: Yinelenen Kay\u0131tlar, Veri Temizli\u011fi, SQL, Python, Pandas, Veri Analizi, COUNT, GROUP BY, HAVING, Veritaban\u0131, Excel, COUNTIF, Fatih Soysal<br \/>\n&#8220;`<\/p>\n","protected":false},"excerpt":{"rendered":"&#8220;`html Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131 Merhaba! Fatih Soysal olarak, bug\u00fcn sizlere sat\u0131r tabanl\u0131&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-4188","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>Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131<\/title>\n<meta name=\"description\" content=\"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlere sat\u0131r tabanl\u0131 verilerde, belirli bir anahtar s\u00fctuna g\u00f6re yinelenen kay\u0131tlar\u0131n nas\u0131l say\u0131laca\u011f\u0131n\u0131 detayl\u0131 olarak a\u00e7\u0131klayaca\u011f\u0131m. Bu i\u015flem, veri analizi ve veri temizleme s\u00fcre\u00e7lerinde olduk\u00e7a \u00f6nemlidir. \u00d6rne\u011fin, bir m\u00fc\u015fteri veritaban\u0131nda ayn\u0131 m\u00fc\u015fteri i\u00e7in birden fazla kay\u0131t varsa, bu kay\u0131tlar\u0131n say\u0131s\u0131n\u0131 tespit ederek veri kalitesini iyile\u015ftirebilir ve gereksiz verilerden kurtulabiliriz. Veri analizi, i\u015f kararlar\u0131n\u0131n kalitesini do\u011frudan etkiler. Dolay\u0131s\u0131yla do\u011fru ve temiz verilerle \u00e7al\u0131\u015fmak \u015fartt\u0131r. Bu nedenle, bu makalede ele alaca\u011f\u0131m\u0131z konu b\u00fcy\u00fck \u00f6nem ta\u015f\u0131maktad\u0131r.\" \/>\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\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131\" \/>\n<meta property=\"og:description\" content=\"Merhaba! Fatih Soysal olarak, bug\u00fcn sizlere sat\u0131r tabanl\u0131 verilerde, belirli bir anahtar s\u00fctuna g\u00f6re yinelenen kay\u0131tlar\u0131n nas\u0131l say\u0131laca\u011f\u0131n\u0131 detayl\u0131 olarak a\u00e7\u0131klayaca\u011f\u0131m. Bu i\u015flem, veri analizi ve veri temizleme s\u00fcre\u00e7lerinde olduk\u00e7a \u00f6nemlidir. \u00d6rne\u011fin, bir m\u00fc\u015fteri veritaban\u0131nda ayn\u0131 m\u00fc\u015fteri i\u00e7in birden fazla kay\u0131t varsa, bu kay\u0131tlar\u0131n say\u0131s\u0131n\u0131 tespit ederek veri kalitesini iyile\u015ftirebilir ve gereksiz verilerden kurtulabiliriz. Veri analizi, i\u015f kararlar\u0131n\u0131n kalitesini do\u011frudan etkiler. Dolay\u0131s\u0131yla do\u011fru ve temiz verilerle \u00e7al\u0131\u015fmak \u015fartt\u0131r. Bu nedenle, bu makalede ele alaca\u011f\u0131m\u0131z konu b\u00fcy\u00fck \u00f6nem ta\u015f\u0131maktad\u0131r.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2024-11-18T03:30:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/example.com\/grafik.png\" \/>\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\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131\",\"datePublished\":\"2024-11-18T03:30:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\"},\"wordCount\":710,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"image\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/example.com\/grafik.png\",\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/#respond\"]}],\"copyrightYear\":\"2024\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/\",\"name\":\"Sat\u0131r Tabanl\u0131 Verilerde Anahtar S\u00fctuna G\u00f6re Yinelenen Kay\u0131tlar\u0131n Say\u0131m\u0131\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/satir-tabanli-verilerde-anahtar-sutuna-gore-yinelenen-kayitlarin-sayimi\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/example.com\/grafik.png\",\"datePublished\":\"2024-11-18T03:30:15+00:00\",\"description\":\"Merhaba! 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