{"id":10294,"date":"2026-11-11T11:16:33","date_gmt":"2026-11-11T08:16:33","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10294"},"modified":"2026-11-11T11:16:33","modified_gmt":"2026-11-11T08:16:33","slug":"sql-join-turleri-nedir","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/sql-join-turleri-nedir\/?lang=fr","title":{"rendered":"SQL JOIN T\u00fcrleri Nedir?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritaban\u0131 y\u00f6netim sistemlerinin (RDBMS) temel mant\u0131\u011f\u0131, veriyi tekrara d\u00fc\u015fmeden, mant\u0131ksal par\u00e7alara b\u00f6lerek normalize edilmi\u015f tablolarda saklamakt\u0131r. Bu yakla\u015f\u0131m veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korur ve depolama optimizasyonu sa\u011flar. Ancak raporlama, analiz ya da kullan\u0131c\u0131ya anlaml\u0131 bir veri seti sunma a\u015famas\u0131nda, farkl\u0131 tablolara da\u011f\u0131t\u0131lm\u0131\u015f bu verilerin tekrar bir araya getirilmesi gerekir. \u0130\u015fte bu noktada sql join mekanizmas\u0131 devreye girer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki veya daha fazla tabloyu ortak s\u00fctunlar (genellikle birincil anahtar ve yabanc\u0131 anahtar ili\u015fkisi) \u00fczerinden birle\u015ftirmeyi sa\u011flayan SQL JOIN komutlar\u0131, veritaban\u0131 sorgulamas\u0131n\u0131n en kritik bile\u015fenidir. Do\u011fru join t\u00fcr\u00fcn\u00fcn se\u00e7ilmemesi, yanl\u0131\u015f sonu\u00e7 k\u00fcmelerine veya ciddi performans kay\u0131plar\u0131na yol a\u00e7abilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6rnek Tablo Yap\u0131s\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Konuyu somutla\u015ft\u0131rmak ad\u0131na iki basit tablo \u00fczerinden ilerleyelim: <code>kullanicilar<\/code> ve <code>departmanlar<\/code>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>kullanicilar<\/code> tablosu:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>id: 1, ad: Ahmet, departman_id: 10<\/li>\n\n<li>id: 2, ad: Mehmet, departman_id: 20<\/li>\n\n<li>id: 3, ad: Ay\u015fe, departman_id: NULL<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><code>departmanlar<\/code> tablosu:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>id: 10, departman_adi: Yaz\u0131l\u0131m<\/li>\n\n<li>id: 20, departman_adi: Siber G\u00fcvenlik<\/li>\n\n<li>id: 30, departman_adi: \u0130nsan Kaynaklar\u0131<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bu senaryoda Ay\u015fe hen\u00fcz bir departmana atanmam\u0131\u015ft\u0131r, \u0130nsan Kaynaklar\u0131 departman\u0131nda ise hen\u00fcz kay\u0131tl\u0131 bir \u00e7al\u0131\u015fan bulunmamaktad\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">INNER JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">INNER JOIN, birle\u015ftirilen her iki tabloda da e\u015fle\u015fen kay\u0131tlar\u0131 d\u00f6nd\u00fcr\u00fcr. E\u011fer birinci tablodaki bir kayd\u0131n ikinci tabloda bir kar\u015f\u0131l\u0131\u011f\u0131 yoksa ya da tam tersi bir durum ge\u00e7erliyse, bu kay\u0131tlar sonu\u00e7 k\u00fcmesine dahil edilmez. Varsay\u0131lan join t\u00fcr\u00fc genellikle budur.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, departmanlar.departman_adi\nFROM kullanicilar\nINNER JOIN departmanlar ON kullanicilar.departman_id = departmanlar.id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu sorgu yaln\u0131zca e\u015fle\u015fen sat\u0131rlar\u0131 getirir. Ay\u015fe&#8217;nin departman de\u011feri NULL oldu\u011fu i\u00e7in, \u0130nsan Kaynaklar\u0131 departman\u0131n\u0131n ise e\u015fle\u015fen \u00e7al\u0131\u015fan\u0131 bulunmad\u0131\u011f\u0131 i\u00e7in sonu\u00e7ta yer almaz. Listede yaln\u0131zca Ahmet (Yaz\u0131l\u0131m) ve Mehmet (Siber G\u00fcvenlik) g\u00f6r\u00fcnt\u00fclenir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">LEFT (OUTER) JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LEFT JOIN (veya LEFT OUTER JOIN), sol tarafta belirtilen tablodaki (<code>FROM<\/code> ifadesinden hemen sonra gelen tablo) t\u00fcm kay\u0131tlar\u0131 ko\u015fulsuz olarak getirir. Sa\u011f taraftaki tabloda (<code>JOIN<\/code> ifadesinden sonra gelen tablo) e\u015fle\u015fen bir kay\u0131t varsa o bilgiler eklenir; e\u015fle\u015fme yoksa sa\u011f tablonun s\u00fctunlar\u0131 NULL de\u011feriyle doldurulur.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, departmanlar.departman_adi\nFROM kullanicilar\nLEFT JOIN departmanlar ON kullanicilar.departman_id = departmanlar.id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu sorgunun sonucunda Ahmet ve Mehmet departman bilgileriyle gelir. Ay\u015fe bir departmana atanmam\u0131\u015f olsa bile sol tabloda yer ald\u0131\u011f\u0131 i\u00e7in listelenir; departman_adi s\u00fctunu ise NULL olarak g\u00f6sterilir. Bu y\u00f6ntem, bir ana tablodaki hi\u00e7bir veriyi kaybetmek istemedi\u011finiz durumlarda tercih edilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">RIGHT (OUTER) JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RIGHT JOIN, LEFT JOIN mant\u0131\u011f\u0131n\u0131n tam tersidir. Sa\u011fdaki tablonun t\u00fcm sat\u0131rlar\u0131n\u0131 getirir, soldaki tabloda kar\u015f\u0131l\u0131\u011f\u0131 olmayan sat\u0131rlar i\u00e7in NULL de\u011feri \u00fcretir.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, departmanlar.departman_adi\nFROM kullanicilar\nRIGHT JOIN departmanlar ON kullanicilar.departman_id = departmanlar.id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Burada <code>departmanlar<\/code> tablosundaki t\u00fcm kay\u0131tlar (Yaz\u0131l\u0131m, Siber G\u00fcvenlik, \u0130nsan Kaynaklar\u0131) listelenir. \u0130nsan Kaynaklar\u0131 departman\u0131nda \u00e7al\u0131\u015fan olmad\u0131\u011f\u0131 i\u00e7in <code>ad<\/code> s\u00fctununda NULL de\u011feri d\u00f6ner. Ay\u015fe sa\u011f tabloda bir e\u015fle\u015fmeye sahip olmad\u0131\u011f\u0131 i\u00e7in sonu\u00e7 k\u00fcmesine dahil edilmez. Pratikte \u00e7o\u011fu yaz\u0131l\u0131mc\u0131 sorgu okunabilirli\u011fini korumak i\u00e7in RIGHT JOIN yerine tablo s\u0131ralamas\u0131n\u0131 de\u011fi\u015ftirerek LEFT JOIN kullanmay\u0131 tercih eder.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FULL (OUTER) JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FULL JOIN, hem sol hem de sa\u011f tablodaki t\u00fcm kay\u0131tlar\u0131 birle\u015ftirir. E\u015fle\u015fme sa\u011flanan sat\u0131rlar yan yana getirilir. E\u015fle\u015fmeyen sat\u0131rlar ise di\u011fer tablodan gelen alanlar i\u00e7in NULL de\u011feri alarak sonu\u00e7 k\u00fcmesine eklenir. K\u00fcmeler teorisindeki &#8220;birle\u015fim&#8221; (union) i\u015flemine benzer.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, departmanlar.departman_adi\nFROM kullanicilar\nFULL OUTER JOIN departmanlar ON kullanicilar.departman_id = departmanlar.id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu sorgu sonucunda hem Ay\u015fe (departman\u0131 NULL olarak) hem de \u0130nsan Kaynaklar\u0131 (\u00e7al\u0131\u015fan\u0131 NULL olarak) \u00e7\u0131kt\u0131da yer al\u0131r. E\u015fle\u015fen Ahmet ve Mehmet kay\u0131tlar\u0131 da eksiksiz bi\u00e7imde listelenir. Baz\u0131 veritaban\u0131 motorlar\u0131nda (\u00f6rne\u011fin MySQL) do\u011frudan FULL OUTER JOIN anahtar kelimesi desteklenmez; bunun yerine LEFT JOIN ve RIGHT JOIN sorgular\u0131 <code>UNION<\/code> operat\u00f6r\u00fc ile birle\u015ftirilerek ayn\u0131 sonu\u00e7 elde edilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CROSS JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CROSS JOIN, iki tablo aras\u0131nda Kartezyen \u00e7arp\u0131m (Cartesian Product) \u00fcretir. Yani birinci tablodaki her bir sat\u0131r, ikinci tablodaki t\u00fcm sat\u0131rlarla teker teker e\u015fle\u015ftirilir. Bu i\u015flemde birle\u015ftirme ko\u015fulu (<code>ON<\/code> ifadesi) kullan\u0131lmaz.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, departmanlar.departman_adi\nFROM kullanicilar\nCROSS JOIN departmanlar;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sol tabloda 3 sat\u0131r, sa\u011f tabloda 3 sat\u0131r varsa, CROSS JOIN sonucunda toplam 9 sat\u0131rl\u0131k bir veri k\u00fcmesi olu\u015fur. B\u00fcy\u00fck veri setlerinde yanl\u0131\u015fl\u0131kla veya filtresiz \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda bellek ve i\u015flemci t\u00fckenmesine neden olabilir. Olas\u0131l\u0131k hesaplamalar\u0131, matris \u00fcretimi veya kombinasyon testleri gibi \u00f6zel senaryolar d\u0131\u015f\u0131nda dikkatli kullan\u0131lmal\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SELF JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ayr\u0131 bir SQL komutu olmamakla birlikte, bir tablonun kendisiyle join yap\u0131lmas\u0131na verilen isimdir. Ayn\u0131 tabloya iki farkl\u0131 takma ad (alias) verilerek hiyerar\u015fik veriler sorgulanabilir. Tipik \u00f6rnek, bir \u00e7al\u0131\u015fan\u0131n ayn\u0131 tabloda saklanan y\u00f6neticisini bulmakt\u0131r.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT c.ad AS Calisan, y.ad AS Yonetici\nFROM calisanlar c\nLEFT JOIN calisanlar y ON c.yonetici_id = y.id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu sorguda <code>calisanlar<\/code> tablosu hem \u00e7al\u0131\u015fan listesi hem de y\u00f6netici listesi olarak kullan\u0131lm\u0131\u015f ve her \u00e7al\u0131\u015fan\u0131n y\u00f6neticisi ayn\u0131 sat\u0131ra getirilmi\u015ftir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Performans ve Dikkat Edilmesi Gerekenler<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00fcy\u00fck \u00f6l\u00e7ekli veritabanlar\u0131nda sql join i\u015flemleri y\u00fcksek maliyetli olabilir. Performans\u0131 korumak i\u00e7in \u015fu kurallar g\u00f6z \u00f6n\u00fcnde bulundurulmal\u0131d\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Join ko\u015fullar\u0131nda kullan\u0131lan yabanc\u0131 anahtar (Foreign Key) s\u00fctunlar\u0131nda mutlaka indeks (index) tan\u0131mlanmal\u0131d\u0131r.<\/li>\n\n<li>Gereksiz tablolara join yapmaktan ka\u00e7\u0131n\u0131lmal\u0131d\u0131r; her join ili\u015fkisi veritaban\u0131 motoru i\u00e7in ek bellek ve i\u015flem y\u00fck\u00fcd\u00fcr.<\/li>\n\n<li><code>SELECT *<\/code> kullan\u0131m\u0131 yerine yaln\u0131zca ihtiya\u00e7 duyulan s\u00fctunlar a\u00e7\u0131k\u00e7a belirtilmelidir.<\/li>\n\n<li>Filtreleme ko\u015fullar\u0131 join a\u015famas\u0131nda (<code>ON<\/code> i\u00e7inde) m\u0131 yoksa sonu\u00e7 k\u00fcmesi olu\u015ftuktan sonra m\u0131 (<code>WHERE<\/code> i\u00e7inde) \u00e7al\u0131\u015ft\u0131r\u0131lmal\u0131 sorusu join t\u00fcr\u00fcne g\u00f6re optimize edilmelidir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131m<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SQL JOIN yap\u0131lar\u0131, ili\u015fkisel veritabanlar\u0131n\u0131n g\u00fcc\u00fcn\u00fc ortaya \u00e7\u0131karan en temel ara\u00e7t\u0131r. Hangi join t\u00fcr\u00fcn\u00fcn se\u00e7ilece\u011fi, ihtiya\u00e7 duyulan sonu\u00e7 k\u00fcmesinde e\u015fle\u015fmeyen verilerin nas\u0131l ele al\u0131naca\u011f\u0131na ba\u011fl\u0131d\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sadece kesi\u015fim i\u00e7in INNER JOIN,<\/li>\n\n<li>Sol taraf\u0131n korunmas\u0131 i\u00e7in LEFT JOIN,<\/li>\n\n<li>Sa\u011f taraf\u0131n korunmas\u0131 i\u00e7in RIGHT JOIN,<\/li>\n\n<li>T\u00fcm verilerin korunmas\u0131 i\u00e7in FULL JOIN,<\/li>\n\n<li>T\u00fcm kombinasyonlar i\u00e7in CROSS JOIN kullan\u0131l\u0131r.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Sonraki ad\u0131m olarak, bir test veritaban\u0131nda <code>EXPLAIN<\/code> veya <code>EXPLAIN ANALYZE<\/code> komutlar\u0131n\u0131 kullanarak yazd\u0131\u011f\u0131n\u0131z join sorgular\u0131n\u0131n arka planda nas\u0131l bir y\u00fcr\u00fctme plan\u0131 (Execution Plan) izledi\u011fini inceleyebilirsiniz. Veritaban\u0131 motorunun Nested Loop, Hash Join veya Merge Join algoritmalar\u0131ndan hangisini se\u00e7ti\u011fini g\u00f6zlemlemek, sorgu optimizasyonu yetene\u011finizi ileri seviyeye ta\u015f\u0131yacakt\u0131r.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0130li\u015fkisel veritabanlar\u0131n\u0131n temel ta\u015f\u0131 olan SQL JOIN i\u015flemlerini, t\u00fcrlerini ve aralar\u0131ndaki farklar\u0131 pratik senaryolarla inceliyoruz.<\/p>","protected":false},"author":1,"featured_media":10295,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[230],"tags":[590,254,595,257,266],"class_list":["post-10294","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-veritabani","tag-iliskisel-veritabani","tag-sql","tag-sql-join","tag-veritabani","tag-yazilim-gelistirme"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SQL JOIN T\u00fcrleri Nedir? - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"SQL JOIN t\u00fcrleri nedir, nas\u0131l kullan\u0131l\u0131r? 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