{"id":25694,"date":"2025-07-12T00:15:44","date_gmt":"2025-07-11T21:15:44","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-grubun-null-icerip-icermedigini-kontrol-etme\/"},"modified":"2025-07-12T00:15:44","modified_gmt":"2025-07-11T21:15:44","slug":"postgresql-bir-grubun-null-icerip-icermedigini-kontrol-etme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-grubun-null-icerip-icermedigini-kontrol-etme\/","title":{"rendered":"PostgreSQL: Bir Grubun NULL \u0130\u00e7erip \u0130\u00e7ermedi\u011fini Kontrol Etme"},"content":{"rendered":"<p># PostgreSQL&#8217;de Grupta NULL De\u011feri Kontrol\u00fc Nas\u0131l Yap\u0131l\u0131r?<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, bir grup i\u00e7inde NULL de\u011fer olup olmad\u0131\u011f\u0131n\u0131 kontrol etmeniz gerekebilir. Bu durum, raporlama, veri temizli\u011fi veya karma\u015f\u0131k sorgular olu\u015ftururken s\u0131k\u00e7a kar\u015f\u0131la\u015f\u0131lan bir senaryodur.  Bu makalede, PostgreSQL&#8217;de grup i\u00e7inde NULL de\u011fer kontrol\u00fcn\u00fc ad\u0131m ad\u0131m, basit \u00f6rneklerden karma\u015f\u0131k senaryolara kadar ele alaca\u011f\u0131z.  Farkl\u0131 y\u00f6ntemleri kar\u015f\u0131la\u015ft\u0131rarak, performans optimizasyonuna odaklanaca\u011f\u0131z ve ger\u00e7ek d\u00fcnya \u00f6rnekleriyle konuyu peki\u015ftirece\u011fiz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">ANY<\/code> operat\u00f6r\u00fc ile basit kontrol, basit kod \u00f6rne\u011fi.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat \u00f6rne\u011fi (\u00fcr\u00fcn yorumlar\u0131), <code class=\"language-\">COALESCE<\/code> fonksiyonu ile optimizasyon ipu\u00e7lar\u0131.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Performans analizi (indeksleme etkisi),  <code class=\"language-\">FILTER<\/code>  kullan\u0131m\u0131, edge case&#8217;ler (bo\u015f gruplar).<\/p>\n<p><strong>PostgreSQL&#8217;de NULL De\u011ferleri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL&#8217;de NULL, bir de\u011ferin bilinmedi\u011fini veya mevcut olmad\u0131\u011f\u0131n\u0131 temsil eder.  NULL, s\u0131f\u0131r veya bo\u015f bir dizeyle ayn\u0131 de\u011fildir.  NULL ile yap\u0131lan kar\u015f\u0131la\u015ft\u0131rma i\u015flemleri genellikle <code class=\"language-\">FALSE<\/code> sonucu \u00fcretir. Bu nedenle, bir grupta NULL de\u011fer olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in \u00f6zel teknikler kullanmam\u0131z gerekir.  \u00d6rne\u011fin, <code class=\"language-\">WHERE column = NULL<\/code> ko\u015fulu do\u011fru \u00e7al\u0131\u015fmaz.<\/p>\n<p><strong>PostgreSQL&#8217;de Grupta NULL Var M\u0131 Yok Mu Nas\u0131l Kontrol Edilir? (Ad\u0131m Ad\u0131m)<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">ANY<\/code> Operat\u00f6r\u00fc ile Basit Kontrol<\/p>\n<p>En basit yakla\u015f\u0131m, <code class=\"language-\">ANY<\/code> operat\u00f6r\u00fcyle birlikte <code class=\"language-\">array_agg<\/code> fonksiyonunu kullanmakt\u0131r. <code class=\"language-\">array_agg<\/code>, bir s\u00fctunun de\u011ferlerini bir diziye toplar.  Sonras\u0131nda <code class=\"language-\">ANY<\/code> operat\u00f6r\u00fc ile bu dizide NULL olup olmad\u0131\u011f\u0131n\u0131 kontrol edebiliriz.<\/p>\n<p>\u00d6rnek: <code class=\"language-\">musteriler<\/code> tablomuzda <code class=\"language-\">sehir<\/code> s\u00fctunu olsun.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    sehir,\n    CASE\n        WHEN ANY(array_agg(sehir)) IS NULL THEN 'NULL De\u011fer Var'\n        ELSE 'NULL De\u011fer Yok'\n    END as null_durumu\nFROM\n    musteriler\nGROUP BY\n    sehir;<\/code><\/pre>\n<p>Bu sorgu, her \u015fehir i\u00e7in <code class=\"language-\">sehir<\/code> s\u00fctunundaki de\u011ferleri bir diziye toplar ve bu dizide NULL varsa &#8220;NULL De\u011fer Var&#8221;, yoksa &#8220;NULL De\u011fer Yok&#8221; sonucunu d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi: \u00dcr\u00fcn Yorumlar\u0131 Analizi<\/strong><\/p>\n<p>Bir e-ticaret sitesinin \u00fcr\u00fcn yorumlar\u0131 tablosunda (\u00f6rne\u011fin, <code class=\"language-\">urun_yorumlari<\/code> tablosu) yorum yazmayan kullan\u0131c\u0131lar i\u00e7in <code class=\"language-\">yorum_metni<\/code> s\u00fctunu NULL olabilir.  Hangi \u00fcr\u00fcnlerin NULL yorumlara sahip oldu\u011funu bulmak i\u00e7in a\u015fa\u011f\u0131daki sorguyu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    urun_id,\n    CASE\n        WHEN ANY(array_agg(yorum_metni)) IS NULL THEN TRUE\n        ELSE FALSE\n    END as null_yorum_var_mi\nFROM\n    urun_yorumlari\nGROUP BY\n    urun_id;<\/code><\/pre>\n<p>Bu sorgu, her \u00fcr\u00fcn i\u00e7in yorum metinlerini bir diziye toplar ve NULL de\u011fer olup olmad\u0131\u011f\u0131n\u0131 kontrol eder.  <code class=\"language-\">null_yorum_var_mi<\/code> s\u00fctunu, NULL yorum bulunan \u00fcr\u00fcnler i\u00e7in <code class=\"language-\">TRUE<\/code>, di\u011ferleri i\u00e7in <code class=\"language-\">FALSE<\/code> de\u011ferini d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>Orta Seviye:  <code class=\"language-\">COALESCE<\/code> Fonksiyonu ile Optimizasyon<\/strong><\/p>\n<p><code class=\"language-\">ANY<\/code> operat\u00f6r\u00fc ile yap\u0131lan yakla\u015f\u0131m, b\u00fcy\u00fck tablolarda performans sorunlar\u0131na yol a\u00e7abilir.  Daha verimli bir y\u00f6ntem, <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanmakt\u0131r. <code class=\"language-\">COALESCE<\/code>, birden fazla arg\u00fcmandan ilk NULL olmayan de\u011feri d\u00f6nd\u00fcr\u00fcr.  E\u011fer t\u00fcm arg\u00fcmanlar NULL ise, NULL d\u00f6nd\u00fcr\u00fcr.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    sehir,\n    CASE\n        WHEN COALESCE(MAX(sehir), '') = '' THEN 'NULL De\u011fer Var'\n        ELSE 'NULL De\u011fer Yok'\n    END as null_durumu\nFROM\n    musteriler\nGROUP BY\n    sehir;<\/code><\/pre>\n<p>Bu sorgu, her \u015fehir i\u00e7in <code class=\"language-\">sehir<\/code> s\u00fctunundaki de\u011ferlerin maksimumunu al\u0131r.  E\u011fer t\u00fcm de\u011ferler NULL ise, <code class=\"language-\">MAX(sehir)<\/code> NULL olur ve <code class=\"language-\">COALESCE<\/code> bo\u015f bir dize (&#8221;) d\u00f6nd\u00fcr\u00fcr.  Bu sayede, NULL de\u011ferlerin varl\u0131\u011f\u0131n\u0131 daha verimli bir \u015fekilde tespit edebiliriz.  Bu y\u00f6ntem, <code class=\"language-\">array_agg<\/code> fonksiyonunun kullan\u0131lmad\u0131\u011f\u0131 i\u00e7in genellikle daha h\u0131zl\u0131d\u0131r. Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n PostgreSQL performans optimizasyonu hakk\u0131ndaki yaz\u0131lar\u0131n\u0131](https:\/\/fatihsoysal.com) inceleyebilirsiniz.<\/p>\n<p><strong>\u0130leri Seviye: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p><strong>Performans Analizi:<\/strong>  B\u00fcy\u00fck tablolarda, do\u011fru indeksleme performans\u0131 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde etkiler.  <code class=\"language-\">sehir<\/code> s\u00fctununa bir indeks eklemek, sorgunun \u00e7al\u0131\u015fma s\u00fcresini \u00f6nemli \u00f6l\u00e7\u00fcde k\u0131saltabilir.  <code class=\"language-\">CREATE INDEX idx_sehir ON musteriler (sehir);<\/code> komutu ile indeks olu\u015fturabilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong>  Bo\u015f gruplar \u00f6zel bir durumdur.  E\u011fer bir \u015fehir i\u00e7in hi\u00e7 kay\u0131t yoksa, <code class=\"language-\">MAX(sehir)<\/code> NULL olur ve <code class=\"language-\">COALESCE<\/code> bo\u015f bir dize d\u00f6nd\u00fcr\u00fcr.  Bu durum, NULL de\u011fer olup olmad\u0131\u011f\u0131n\u0131 de\u011fil, ilgili \u015fehir i\u00e7in veri olup olmad\u0131\u011f\u0131n\u0131 g\u00f6sterir.  Bu durumu ay\u0131rmak i\u00e7in, <code class=\"language-\">COUNT(*)<\/code> fonksiyonunu kullanarak her grubun kay\u0131t say\u0131s\u0131n\u0131 kontrol edebilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n    sehir,\n    CASE\n        WHEN COUNT(*) = 0 THEN 'Grup Bo\u015f'\n        WHEN COALESCE(MAX(sehir), '') = '' THEN 'NULL De\u011fer Var'\n        ELSE 'NULL De\u011fer Yok'\n    END as durum\nFROM\n    musteriler\nGROUP BY\n    sehir;<\/code><\/pre>\n<p><strong>FILTER KULLANIMI:<\/strong>  PostgreSQL 9.4 ve \u00fczeri s\u00fcr\u00fcmlerinde <code class=\"language-\">FILTER<\/code>  kullanarak daha okunakl\u0131 ve performansl\u0131 sorgular yazabilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n  sehir,\n  CASE\n    WHEN COUNT(*) FILTER (WHERE sehir IS NULL) &gt; 0 THEN 'NULL De\u011fer Var'\n    ELSE 'NULL De\u011fer Yok'\n  END as null_durumu\nFROM musteriler\nGROUP BY sehir;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">sehir<\/code> s\u00fctununda NULL olan kay\u0131tlar\u0131 sayarak daha do\u011frudan bir kontrol sa\u011flar.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de bir grupta NULL de\u011fer olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in farkl\u0131 y\u00f6ntemler mevcuttur.  Basit durumlarda <code class=\"language-\">ANY<\/code> operat\u00f6r\u00fc yeterli olabilirken, b\u00fcy\u00fck veritabanlar\u0131 i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonu ve uygun indeksleme ile performans optimizasyonu sa\u011flanmal\u0131d\u0131r.  Bo\u015f gruplar ve NULL de\u011ferlerin farkl\u0131 anlamlar ta\u015f\u0131d\u0131\u011f\u0131 durumlarda, <code class=\"language-\">COUNT(*)<\/code> ve <code class=\"language-\">FILTER<\/code>  kullan\u0131m\u0131 daha robust \u00e7\u00f6z\u00fcmler sunar.  Uygun y\u00f6ntemin se\u00e7imi, veritaban\u0131n\u0131z\u0131n b\u00fcy\u00fckl\u00fc\u011f\u00fc, veri da\u011f\u0131l\u0131m\u0131 ve performans gereksinimlerine ba\u011fl\u0131d\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>NULL de\u011ferler ile nas\u0131l \u00e7al\u0131\u015f\u0131l\u0131r?<\/strong>  NULL de\u011ferler \u00f6zel bir durumdur ve standart kar\u015f\u0131la\u015ft\u0131rma operat\u00f6rleri ile do\u011frudan kar\u015f\u0131la\u015ft\u0131r\u0131lamazlar. <code class=\"language-\">IS NULL<\/code> ve <code class=\"language-\">IS NOT NULL<\/code> operat\u00f6rleri kullan\u0131lmal\u0131d\u0131r.<\/p>\n<p>2. <strong>Performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong>  Uygun indeksler olu\u015fturmak, gereksiz fonksiyon \u00e7a\u011fr\u0131lar\u0131ndan ka\u00e7\u0131nmak ve veritaban\u0131 optimizasyon tekniklerini uygulamak performans\u0131 art\u0131r\u0131r.<\/p>\n<p>3. <strong><code class=\"language-\">array_agg<\/code> fonksiyonunun dezavantajlar\u0131 nelerdir?<\/strong>  B\u00fcy\u00fck gruplar i\u00e7in performans sorunlar\u0131na yol a\u00e7abilir ve bellek t\u00fcketimini art\u0131rabilir.<\/p>\n<p>4.  <strong><code class=\"language-\">COALESCE<\/code> fonksiyonu ne zaman tercih edilmelidir?<\/strong>  <code class=\"language-\">ANY<\/code> operat\u00f6r\u00fcnden daha verimli oldu\u011fu i\u00e7in, \u00f6zellikle b\u00fcy\u00fck veritabanlar\u0131nda tercih edilmelidir.<\/p>\n<p>5. <strong><code class=\"language-\">FILTER<\/code> kullanman\u0131n avantajlar\u0131 nelerdir?<\/strong>  Daha okunakl\u0131 ve baz\u0131 durumlarda daha performansl\u0131 sorgular yaz\u0131lmas\u0131n\u0131 sa\u011flar.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Grupta NULL De\u011feri Kontrol\u00fc Nas\u0131l Yap\u0131l\u0131r? PostgreSQL veritaban\u0131n\u0131zda \u00e7al\u0131\u015f\u0131rken, bir grup i\u00e7inde NULL de\u011fer olup olmad\u0131\u011f\u0131n\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":[644],"tags":[],"class_list":{"0":"post-25694","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PostgreSQL: Bir Grubun NULL \u0130\u00e7erip \u0130\u00e7ermedi\u011fini Kontrol Etme<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta name=\"robots\" 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