{"id":35242,"date":"2025-11-27T09:40:39","date_gmt":"2025-11-27T06:40:39","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=35242"},"modified":"2025-11-27T09:40:39","modified_gmt":"2025-11-27T06:40:39","slug":"sqlde-viewlari-gorunumleri-nasil-kullanilir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/sqlde-viewlari-gorunumleri-nasil-kullanilir\/","title":{"rendered":"SQL’de View’lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r?"},"content":{"rendered":"

<\/p>\n

SQL’de View’lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r?<\/h2>\n

Veritaban\u0131 y\u00f6netim sistemlerinde (DBMS) veriler genellikle karma\u015f\u0131k yap\u0131lar, \u00e7ok say\u0131da tablo ve aralar\u0131ndaki ili\u015fkilerle saklan\u0131r. Bu karma\u015f\u0131kl\u0131k, veri eri\u015fimini ve y\u00f6netimini zorla\u015ft\u0131rabilir. \u0130\u015fte tam bu noktada SQL View’lar (G\u00f6r\u00fcn\u00fcmler) devreye girer. View’lar, fiziksel olarak veri depolamayan, ancak bir veya daha fazla temel tablodan al\u0131nan verileri mant\u0131ksal olarak temsil eden sanal tablolard\u0131r. Bir View, asl\u0131nda bir sorgunun depolanm\u0131\u015f halidir ve her \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda bu sorgu \u00e7al\u0131\u015ft\u0131r\u0131larak g\u00fcncel verileri sunar.<\/p>\n

Bu makalede, SQL View’lar\u0131n ne oldu\u011funu, neden kullan\u0131ld\u0131\u011f\u0131n\u0131, nas\u0131l olu\u015fturulup y\u00f6netildi\u011fini, avantajlar\u0131n\u0131, dezavantajlar\u0131n\u0131 ve en iyi uygulamalar\u0131n\u0131 derinlemesine inceleyece\u011fiz. Amac\u0131m\u0131z, View’lar\u0131n g\u00fcc\u00fcn\u00fc tam olarak anlaman\u0131z\u0131 ve veritaban\u0131 projelerinizde etkin bir \u015fekilde kullanman\u0131z\u0131 sa\u011flamakt\u0131r.<\/p>\n

View Nedir?<\/h3>\n

Bir SQL View, temelinde bir SELECT<\/code> ifadesidir. Bu SELECT<\/code> ifadesi, bir veya birden fazla tablodan veri \u00e7ekmek i\u00e7in kullan\u0131l\u0131r. View’\u0131 olu\u015fturdu\u011funuzda, bu SELECT<\/code> ifadesi veritaban\u0131nda depolan\u0131r ve ona bir isim verilir. Daha sonra, bu View’a sanki ger\u00e7ek bir tabloymu\u015f gibi sorgu g\u00f6nderebilirsiniz.<\/p>\n

\u00d6rne\u011fin, bir M\u00fc\u015fteriler<\/code> tablosu ve bir Sipari\u015fler<\/code> tablonuz olsun. Bu iki tablonun birle\u015fiminden olu\u015fan ve sadece belirli bir b\u00f6lgedeki m\u00fc\u015fterilerin son sipari\u015flerini g\u00f6steren karma\u015f\u0131k bir sorguyu s\u00fcrekli \u00e7al\u0131\u015ft\u0131rmak yerine, bu sorguyu bir View olarak kaydedebilirsiniz. B\u00f6ylece, her seferinde uzun ve karma\u015f\u0131k sorguyu yazmak yerine, View’a basit bir SELECT<\/code> ifadesiyle eri\u015ferek istedi\u011finiz verilere ula\u015fabilirsiniz.<\/p>\n

View’lar, veritaban\u0131 \u015femas\u0131n\u0131n bir par\u00e7as\u0131d\u0131r ancak kendi verilerini depolamazlar. Veriler, View’\u0131n temel ald\u0131\u011f\u0131 tablolarda bulunur. Bu, View’lar\u0131n her zaman g\u00fcncel verileri sunmas\u0131n\u0131 sa\u011flar; temel tablolardaki herhangi bir de\u011fi\u015fiklik, View arac\u0131l\u0131\u011f\u0131yla an\u0131nda yans\u0131t\u0131l\u0131r.<\/p>\n

Neden View Kullan\u0131lmal\u0131?<\/h3>\n

View’lar, veritaban\u0131 y\u00f6netiminde ve uygulama geli\u015ftirmede bir\u00e7ok \u00f6nemli avantaj sunar:<\/p>\n

* Veri G\u00fcvenli\u011fi ve Yetkilendirme:<\/strong> View’lar, kullan\u0131c\u0131lara belirli s\u00fctunlara veya sat\u0131rlara eri\u015fim izni vererek veri g\u00fcvenli\u011fini art\u0131r\u0131r. \u00d6rne\u011fin, bir \u00c7al\u0131\u015fanlar<\/code> tablosunda maa\u015f bilgileri gibi hassas veriler olabilir. Bir View olu\u015fturarak, bu hassas s\u00fctunlar\u0131 hari\u00e7 tutabilir ve sadece belirli departmanlardaki \u00e7al\u0131\u015fanlar\u0131n adlar\u0131n\u0131, soyadlar\u0131n\u0131 ve departmanlar\u0131n\u0131 g\u00f6steren bir View’a eri\u015fim izni verebilirsiniz. Bu sayede, kullan\u0131c\u0131lar temel tablolara do\u011frudan eri\u015fmeden sadece yetkili olduklar\u0131 verilere ula\u015fabilirler.
\n* Karma\u015f\u0131kl\u0131\u011f\u0131 Basitle\u015ftirme:<\/strong> Karma\u015f\u0131k JOIN<\/code> i\u015flemleri, alt sorgular veya hesaplanm\u0131\u015f s\u00fctunlar i\u00e7eren sorgular\u0131 bir View i\u00e7inde kaps\u00fclleyerek, son kullan\u0131c\u0131lara veya uygulama geli\u015ftiricilere daha basit bir veri modeli sunabilirsiniz. Bu, sorgu yazmay\u0131 kolayla\u015ft\u0131r\u0131r ve hata yapma olas\u0131l\u0131\u011f\u0131n\u0131 azalt\u0131r.
\n* Veri Ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131:<\/strong> Temel tablo yap\u0131s\u0131nda yap\u0131lan de\u011fi\u015fiklikler (\u00f6rne\u011fin, s\u00fctun ad\u0131 de\u011fi\u015fikli\u011fi veya tablolar\u0131n birle\u015ftirilmesi\/ayr\u0131lmas\u0131), View’\u0131n tan\u0131m\u0131 g\u00fcncellenerek uygulama katman\u0131na yans\u0131t\u0131lmadan y\u00f6netilebilir. Bu, uygulaman\u0131n veritaban\u0131 \u015femas\u0131 de\u011fi\u015fikliklerinden daha az etkilenmesini sa\u011flar. View, uygulama ile temel tablolar aras\u0131nda bir soyutlama katman\u0131 g\u00f6revi g\u00f6r\u00fcr.
\n* Veri Tutarl\u0131l\u0131\u011f\u0131:<\/strong> Belirli bir i\u015f kural\u0131na g\u00f6re hesaplanan veya birle\u015ftirilen verilerin her zaman ayn\u0131 \u015fekilde sunulmas\u0131n\u0131 sa\u011flar. \u00d6rne\u011fin, bir sat\u0131\u015f raporunda toplam tutar\u0131n her zaman belirli bir form\u00fclle hesaplanmas\u0131 gerekiyorsa, bu form\u00fcl\u00fc bir View i\u00e7inde tan\u0131mlayarak tutarl\u0131l\u0131\u011f\u0131 garanti alt\u0131na alabilirsiniz.
\n* Veri Yeniden Kullan\u0131m\u0131:<\/strong> S\u0131k\u00e7a kullan\u0131lan karma\u015f\u0131k sorgular\u0131 bir View olarak tan\u0131mlayarak, bu sorgular\u0131 tekrar tekrar yazmaktan kurtulur ve kod tekrar\u0131n\u0131 azalt\u0131rs\u0131n\u0131z.
\n* Performans \u0130yile\u015ftirmesi (\u00d6zellikle Materialized View’lar ile):<\/strong> Standart View’lar genellikle performans iyile\u015ftirmesi sa\u011flamaz, hatta k\u00fc\u00e7\u00fck bir ek y\u00fck getirebilirler \u00e7\u00fcnk\u00fc her \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda temel sorguyu yeniden \u00e7al\u0131\u015ft\u0131r\u0131rlar. Ancak, baz\u0131 veritaban\u0131 sistemlerinde (\u00f6rne\u011fin Oracle’da Materialized View’lar, SQL Server’da Indexed View’lar) View’\u0131n sonu\u00e7lar\u0131 fiziksel olarak depolanabilir ve bu da \u00f6zellikle raporlama ve analitik sorgular i\u00e7in \u00f6nemli performans art\u0131\u015flar\u0131 sa\u011flayabilir.<\/p>\n

View Olu\u015fturma (CREATE VIEW)<\/h3>\n

View olu\u015fturmak i\u00e7in CREATE VIEW<\/code> ifadesi kullan\u0131l\u0131r. Temel s\u00f6zdizimi a\u015fa\u011f\u0131daki gibidir:<\/p>\n

CREATE VIEW ViewAdi AS\nSELECT sutun1, sutun2, ...\nFROM tablo1\nJOIN tablo2 ON tablo1.id = tablo2.id\nWHERE kosul;<\/code><\/pre>\n
\u00d6rnek:<\/strong><\/p>\n
Diyelim ki bir Calisanlar<\/code> tablonuz (CalisanID, Ad, Soyad, Maas, DepartmanID) ve bir Departmanlar<\/code> tablonuz (DepartmanID, DepartmanAdi) var. Maa\u015f bilgisi hassas oldu\u011fu i\u00e7in, y\u00f6neticilerin sadece \u00e7al\u0131\u015fanlar\u0131n ad\u0131n\u0131, soyad\u0131n\u0131 ve departman ad\u0131n\u0131 g\u00f6rmesini sa\u011flayan bir View olu\u015ftural\u0131m:<\/p>\n
CREATE VIEW V_CalisanDepartmanBilgileri AS\nSELECT\n    C.Ad,\n    C.Soyad,\n    D.DepartmanAdi\nFROM\n    Calisanlar AS C\nJOIN\n    Departmanlar AS D ON C.DepartmanID = D.DepartmanID\nWHERE\n    C.Aktif = 1; -- Sadece aktif \u00e7al\u0131\u015fanlar\u0131 g\u00f6ster<\/code><\/pre>\n
Bu View’\u0131 olu\u015fturduktan sonra, t\u0131pk\u0131 bir tablo gibi sorgulayabilirsiniz:<\/p>\n
SELECT * FROM V_CalisanDepartmanBilgileri;<\/code><\/pre>\n
Bu sorgu, V_CalisanDepartmanBilgileri<\/code> View’\u0131n\u0131n temel ald\u0131\u011f\u0131 SELECT<\/code> ifadesini \u00e7al\u0131\u015ft\u0131racak ve g\u00fcncel verileri size sunacakt\u0131r.<\/p>\n
Ek Se\u00e7enekler:<\/strong><\/p>\n
*   WITH ENCRYPTION<\/code> (SQL Server):<\/strong> View’\u0131n tan\u0131m\u0131n\u0131 \u015fifreleyerek, di\u011fer kullan\u0131c\u0131lar\u0131n sp_helptext<\/code> gibi sistem prosed\u00fcrleri arac\u0131l\u0131\u011f\u0131yla View’\u0131n alt\u0131nda yatan sorguyu g\u00f6rmesini engeller. Bu, View’\u0131n i\u015f mant\u0131\u011f\u0131n\u0131 gizlemek i\u00e7in kullan\u0131labilir.
\n*   WITH SCHEMABINDING<\/code> (SQL Server):<\/strong> View’\u0131n temel ald\u0131\u011f\u0131 tablolarda yap\u0131sal de\u011fi\u015fiklikler yap\u0131lmas\u0131n\u0131 engeller. Bu, View’\u0131n temel ald\u0131\u011f\u0131 nesnelerin silinmesini veya s\u00fctunlar\u0131n\u0131n de\u011fi\u015ftirilmesini \u00f6nleyerek View’\u0131n bozulmas\u0131n\u0131 engeller.
\n*   WITH CHECK OPTION<\/code>:<\/strong> Bu \u00f6nemli bir se\u00e7enektir ve View arac\u0131l\u0131\u011f\u0131yla veri ekleme veya g\u00fcncelleme i\u015flemlerinde kullan\u0131l\u0131r. E\u011fer bir View, belirli bir WHERE<\/code> ko\u015fulu i\u00e7eriyorsa ve siz bu View \u00fczerinden veri eklemeye veya g\u00fcncellemeye \u00e7al\u0131\u015f\u0131yorsan\u0131z, WITH CHECK OPTION<\/code> se\u00e7ene\u011fi, eklenen veya g\u00fcncellenen verinin View’\u0131n WHERE<\/code> ko\u015fulunu hala kar\u015f\u0131lad\u0131\u011f\u0131ndan emin olur. E\u011fer ko\u015fulu kar\u015f\u0131lam\u0131yorsa i\u015flem reddedilir. Daha detayl\u0131 bilgiye “View Arac\u0131l\u0131\u011f\u0131yla Veri G\u00fcncelleme” b\u00f6l\u00fcm\u00fcnde de\u011finece\u011fiz.<\/p>\n
CREATE VIEW V_AktifCalisanlar AS\nSELECT CalisanID, Ad, Soyad, DepartmanID\nFROM Calisanlar\nWHERE Aktif = 1\nWITH CHECK OPTION;<\/code><\/pre>\n
View T\u00fcrleri<\/h3>\n
SQL’de genel olarak iki ana View t\u00fcr\u00fc vard\u0131r:<\/p>\n
1.  Standart (Mant\u0131ksal) View’lar:<\/strong>
\n    *   Bunlar, yukar\u0131da bahsetti\u011fimiz gibi, temelinde bir SELECT<\/code> ifadesi olan ve veriyi fiziksel olarak depolamayan View’lard\u0131r.
\n    *   Her \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda temel sorguyu yeniden \u00e7al\u0131\u015ft\u0131r\u0131rlar.
\n    *   En yayg\u0131n kullan\u0131lan View t\u00fcr\u00fcd\u00fcr.
\n    *   Genellikle performans art\u0131\u015f\u0131 sa\u011flamazlar, ancak karma\u015f\u0131kl\u0131\u011f\u0131 basitle\u015ftirir ve g\u00fcvenli\u011fi art\u0131r\u0131rlar.<\/p>\n
2.  Materialized View’lar (Fiziksel \/ \u0130ndeksli View’lar):<\/strong>
\n    *   Bu View’lar, temel sorgunun sonucunu fiziksel olarak veritaban\u0131nda depolarlar. Yani, View’\u0131n kendisi bir tablo gibi davran\u0131r ve verileri diskte saklar.
\n    *   Temel tablolardaki de\u011fi\u015fiklikler, Materialized View’a otomatik olarak veya manuel olarak senkronize edilmelidir (yenileme i\u015flemi).
\n    *   Avantaj\u0131:<\/strong> \u00d6zellikle karma\u015f\u0131k sorgular veya b\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde s\u0131k\u00e7a \u00e7al\u0131\u015f\u0131lan raporlama ve analitik senaryolar\u0131nda sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r. \u00c7\u00fcnk\u00fc sorgu \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda, View’\u0131n depolanm\u0131\u015f verileri do\u011frudan okunur, temel sorgu her seferinde yeniden \u00e7al\u0131\u015ft\u0131r\u0131lmaz.
\n    *   Dezavantaj\u0131:<\/strong> Veri depolama alan\u0131 gerektirir ve temel tablolardaki de\u011fi\u015fikliklerin Materialized View’a yans\u0131t\u0131lmas\u0131 i\u00e7in bir yenileme mekanizmas\u0131 gereklidir. Bu yenileme i\u015flemi, temel tablolardaki verilere g\u00f6re View’\u0131n g\u00fcncelli\u011fini etkiler ve performansa ek y\u00fck getirebilir.
\n    *   Veritaban\u0131na \u00d6zg\u00fc Uygulamalar:<\/strong>
\n        *   Oracle:<\/strong> Do\u011frudan “Materialized View” olarak adland\u0131r\u0131l\u0131r ve \u00e7e\u015fitli yenileme se\u00e7enekleri sunar (ON COMMIT<\/code>, ON DEMAND<\/code>).
\n        *   SQL Server:<\/strong> “Indexed View” (Dizinli G\u00f6r\u00fcn\u00fcm) olarak adland\u0131r\u0131l\u0131r. Bir View’a k\u00fcmelenmi\u015f bir dizin uyguland\u0131\u011f\u0131nda, View’\u0131n sonucu fiziksel olarak depolan\u0131r ve Materialized View gibi davran\u0131r.
\n        *   PostgreSQL:<\/strong> “Materialized View” olarak adland\u0131r\u0131l\u0131r ve REFRESH MATERIALIZED VIEW<\/code> komutuyla yenilenir.<\/p>\n
Materialized View’lar, b\u00fcy\u00fck \u00f6l\u00e7ekli veri ambarlar\u0131 ve i\u015f zekas\u0131 uygulamalar\u0131nda raporlama sorgular\u0131n\u0131n h\u0131zland\u0131r\u0131lmas\u0131 i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n
View Kullan\u0131m\u0131<\/h3>\n
Bir View olu\u015fturulduktan sonra, ona t\u0131pk\u0131 bir tabloymu\u015f gibi eri\u015febilirsiniz.<\/p>\n
View’dan Veri Sorgulama:<\/strong><\/p>\n
SELECT * FROM V_CalisanDepartmanBilgileri;\n\nSELECT Ad, Soyad FROM V_CalisanDepartmanBilgileri WHERE DepartmanAdi = 'IT';<\/code><\/pre>\n
View’lar\u0131 Birle\u015ftirme (Join):<\/strong><\/p>\n
View’lar\u0131 di\u011fer tablolarla veya ba\u015fka View’larla da birle\u015ftirebilirsiniz.<\/p>\n
Diyelim ki V_CalisanDepartmanBilgileri<\/code> View’\u0131n\u0131z var ve bir de V_ProjeBilgileri<\/code> View’\u0131n\u0131z var (ProjeID, ProjeAdi, CalisanID). Bu iki View’\u0131 birle\u015ftirerek \u00e7al\u0131\u015fanlar\u0131n projelerini listeleyebilirsiniz:<\/p>\n
CREATE VIEW V_CalisanProjeDetaylari AS\nSELECT\n    C.Ad,\n    C.Soyad,\n    D.DepartmanAdi,\n    P.ProjeAdi\nFROM\n    V_CalisanDepartmanBilgileri AS C\nJOIN\n    V_ProjeBilgileri AS P ON C.CalisanID = P.CalisanID; -- E\u011fer V_CalisanDepartmanBilgileri'nde CalisanID olsayd\u0131<\/code><\/pre>\n
Yukar\u0131daki \u00f6rnekte V_CalisanDepartmanBilgileri<\/code> View’\u0131nda CalisanID<\/code> s\u00fctunu olmad\u0131\u011f\u0131 i\u00e7in bu do\u011frudan \u00e7al\u0131\u015fmayacakt\u0131r. Bu, View’lar\u0131n temel ald\u0131\u011f\u0131 sorgular\u0131 ve i\u00e7erdi\u011fi s\u00fctunlar\u0131 iyi anlaman\u0131n \u00f6nemini g\u00f6sterir. E\u011fer V_CalisanDepartmanBilgileri<\/code> View’\u0131nda CalisanID<\/code> s\u00fctununu da dahil etseydik, bu birle\u015ftirme m\u00fcmk\u00fcn olurdu.<\/p>\n
\u00d6nemli Not:<\/strong> View’lar i\u00e7 i\u00e7e de kullan\u0131labilir (bir View ba\u015fka bir View’\u0131 temel alabilir). Ancak a\u015f\u0131r\u0131 i\u00e7 i\u00e7e ge\u00e7mi\u015f View’lar, sorgu performans\u0131n\u0131 d\u00fc\u015f\u00fcrebilir ve hata ay\u0131klamay\u0131 zorla\u015ft\u0131rabilir.<\/p>\n
View’\u0131 De\u011fi\u015ftirme (ALTER VIEW)<\/h3>\n
Mevcut bir View’\u0131n tan\u0131m\u0131n\u0131 de\u011fi\u015ftirmek i\u00e7in ALTER VIEW<\/code> ifadesini kullan\u0131r\u0131z. Bu, View’\u0131n temel sorgusunu de\u011fi\u015ftirmek, s\u00fctun eklemek veya \u00e7\u0131karmak i\u00e7in gereklidir.<\/p>\n
ALTER VIEW V_CalisanDepartmanBilgileri AS\nSELECT\n    C.CalisanID, -- CalisanID'yi de ekledik\n    C.Ad,\n    C.Soyad,\n    D.DepartmanAdi,\n    C.GirisTarihi -- Yeni bir s\u00fctun ekledik\nFROM\n    Calisanlar AS C\nJOIN\n    Departmanlar AS D ON C.DepartmanID = D.DepartmanID\nWHERE\n    C.Aktif = 1;<\/code><\/pre>\n
Baz\u0131 veritaban\u0131 sistemleri (\u00f6rne\u011fin MySQL), CREATE OR REPLACE VIEW<\/code> s\u00f6zdizimini de destekler. Bu, View mevcutsa onu g\u00fcnceller, yoksa yenisini olu\u015fturur.<\/p>\n
CREATE OR REPLACE VIEW V_CalisanDepartmanBilgileri AS\nSELECT\n    C.CalisanID,\n    C.Ad,\n    C.Soyad,\n    D.DepartmanAdi,\n    C.GirisTarihi\nFROM\n    Calisanlar AS C\nJOIN\n    Departmanlar AS D ON C.DepartmanID = D.DepartmanID\nWHERE\n    C.Aktif = 1;<\/code><\/pre>\n
View Arac\u0131l\u0131\u011f\u0131yla Veri G\u00fcncelleme (Updatable Views)<\/h3>\n
Standart View’lar genellikle sadece veri okumak i\u00e7in kullan\u0131l\u0131r. Ancak, belirli ko\u015fullar alt\u0131nda, View’lar arac\u0131l\u0131\u011f\u0131yla temel tablolardaki verileri INSERT<\/code>, UPDATE<\/code> ve DELETE<\/code> i\u015flemleriyle de\u011fi\u015ftirmek m\u00fcmk\u00fcnd\u00fcr. Bir View’\u0131n g\u00fcncellenebilir olmas\u0131 i\u00e7in a\u015fa\u011f\u0131daki genel ko\u015fullar\u0131n \u00e7o\u011fu kar\u015f\u0131lanmal\u0131d\u0131r (veritaban\u0131 sistemine g\u00f6re k\u00fc\u00e7\u00fck farkl\u0131l\u0131klar olabilir):<\/p>\n
*   Tek Temel Tablo:<\/strong> View, tek bir temel tabloya dayanmal\u0131d\u0131r. Birden fazla tabloyu JOIN<\/code> ile birle\u015ftiren View’lar genellikle g\u00fcncellenemez.
\n*   Agrega Fonksiyonu Yok:<\/strong> SUM()<\/code>, AVG()<\/code>, COUNT()<\/code>, MIN()<\/code>, MAX()<\/code> gibi agrega fonksiyonlar\u0131 i\u00e7ermemelidir.
\n*   GROUP BY<\/code>, HAVING<\/code>, DISTINCT<\/code> Yok:<\/strong> Bu ifadeler, sonu\u00e7 k\u00fcmesini \u00f6zetledi\u011fi veya grupland\u0131rd\u0131\u011f\u0131 i\u00e7in View’\u0131n g\u00fcncellenebilirli\u011fini engeller.
\n*   Hesaplanm\u0131\u015f S\u00fctunlar Yok:<\/strong> SELECT<\/code> listesinde do\u011frudan temel tablodan gelmeyen hesaplanm\u0131\u015f s\u00fctunlar olmamal\u0131d\u0131r.
\n*   Alt Sorgular Yok:<\/strong> FROM<\/code> veya WHERE<\/code> yan t\u00fcmcelerinde karma\u015f\u0131k alt sorgular olmamal\u0131d\u0131r.
\n*   UNION<\/code>, INTERSECT<\/code>, EXCEPT<\/code> Yok:<\/strong> Bu operat\u00f6rlerle birle\u015ftirilen View’lar g\u00fcncellenemez.
\n*   NOT NULL<\/code> S\u00fctunlar:<\/strong> Temel tabloda NOT NULL<\/code> olarak tan\u0131mlanm\u0131\u015f ve varsay\u0131lan de\u011feri olmayan t\u00fcm s\u00fctunlar View’\u0131n SELECT<\/code> listesinde yer almal\u0131d\u0131r. Aksi takdirde, View \u00fczerinden INSERT<\/code> i\u015flemi yap\u0131lamaz.<\/p>\n
\u00d6rnek G\u00fcncellenebilir View:<\/strong><\/p>\n
CREATE VIEW V_AktifCalisanlar_Guncellenebilir AS\nSELECT CalisanID, Ad, Soyad, Email, DepartmanID\nFROM Calisanlar\nWHERE Aktif = 1;<\/code><\/pre>\n
Bu View \u00fczerinden bir \u00e7al\u0131\u015fan\u0131n ad\u0131n\u0131 g\u00fcncelleyebiliriz:<\/p>\n
UPDATE V_AktifCalisanlar_Guncellenebilir\nSET Ad = 'YeniAd'\nWHERE CalisanID = 101;<\/code><\/pre>\n
Bu UPDATE<\/code> i\u015flemi, asl\u0131nda Calisanlar<\/code> tablosundaki ilgili sat\u0131r\u0131 g\u00fcncelleyecektir.<\/p>\n
WITH CHECK OPTION<\/code> Kullan\u0131m\u0131:<\/strong><\/p>\n
WITH CHECK OPTION<\/code> se\u00e7ene\u011fi, View arac\u0131l\u0131\u011f\u0131yla yap\u0131lan INSERT<\/code> ve UPDATE<\/code> i\u015flemlerinde View’\u0131n WHERE<\/code> ko\u015fulunun korunmas\u0131n\u0131 sa\u011flar.<\/p>\n
CREATE VIEW V_SadeceITCalisanlari AS\nSELECT CalisanID, Ad, Soyad, DepartmanID\nFROM Calisanlar\nWHERE DepartmanID = (SELECT DepartmanID FROM Departmanlar WHERE DepartmanAdi = 'IT')\nWITH CHECK OPTION;<\/code><\/pre>\n
\u015eimdi bu View \u00fczerinden bir \u00e7al\u0131\u015fan\u0131n departman\u0131n\u0131 de\u011fi\u015ftirmeye \u00e7al\u0131\u015fal\u0131m:<\/p>\n
-- Bu \u00e7al\u0131\u015fan\u0131n \u015fu anda IT departman\u0131nda oldu\u011funu varsayal\u0131m.\nUPDATE V_SadeceITCalisanlari\nSET DepartmanID = (SELECT DepartmanID FROM Departmanlar WHERE DepartmanAdi = 'HR')\nWHERE CalisanID = 205;<\/code><\/pre>\n
E\u011fer CalisanID = 205<\/code> olan \u00e7al\u0131\u015fan\u0131n DepartmanID<\/code>‘si HR olarak de\u011fi\u015ftirilirse, bu sat\u0131r art\u0131k V_SadeceITCalisanlari<\/code> View’\u0131n\u0131n WHERE<\/code> ko\u015fulunu (DepartmanAdi = 'IT'<\/code>) kar\u015f\u0131lamayacakt\u0131r. WITH CHECK OPTION<\/code> oldu\u011fu i\u00e7in, bu UPDATE<\/code> i\u015flemi hata verecek ve reddedilecektir. Bu, View’\u0131n mant\u0131ksal b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korumak i\u00e7in \u00e7ok \u00f6nemlidir. E\u011fer WITH CHECK OPTION<\/code> olmasayd\u0131, g\u00fcncelleme ba\u015far\u0131l\u0131 olurdu, ancak g\u00fcncellenen sat\u0131r View’dan kaybolurdu.<\/p>\n
S\u0131n\u0131rlamalar ve Dikkat Edilmesi Gerekenler:<\/strong><\/p>\n
*   G\u00fcncellenebilir View’lar g\u00fc\u00e7l\u00fc olsa da, karma\u015f\u0131k View’lar \u00fczerinden veri de\u011fi\u015ftirmeye \u00e7al\u0131\u015fmak genellikle \u00f6nerilmez. Temel tablolara do\u011frudan eri\u015fmek veya sakl\u0131 yordamlar (stored procedures) kullanmak daha g\u00fcvenli ve y\u00f6netilebilir olabilir.
\n*   Bir View’\u0131n g\u00fcncellenebilir olup olmad\u0131\u011f\u0131n\u0131 anlamak i\u00e7in veritaban\u0131n\u0131z\u0131n belgelerine ba\u015fvurman\u0131z \u00f6nemlidir, \u00e7\u00fcnk\u00fc kurallar veritaban\u0131 sistemine g\u00f6re biraz farkl\u0131l\u0131k g\u00f6sterebilir.<\/p>\n
View’\u0131 Silme (DROP VIEW)<\/h3>\n
Bir View’\u0131 veritaban\u0131ndan kald\u0131rmak i\u00e7in DROP VIEW<\/code> ifadesi kullan\u0131l\u0131r.<\/p>\n
DROP VIEW V_CalisanDepartmanBilgileri;<\/code><\/pre>\n
Bir View’\u0131 silmeden \u00f6nce, bu View’\u0131 kullanan ba\u015fka View’lar, sakl\u0131 yordamlar veya uygulamalar olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek \u00f6nemlidir. View silindi\u011finde, ona ba\u011f\u0131ml\u0131 olan di\u011fer nesneler \u00e7al\u0131\u015fmay\u0131 durdurabilir veya hata verebilir.<\/p>\n
View Kullan\u0131m\u0131n\u0131n Avantajlar\u0131 ve Dezavantajlar\u0131<\/h3>\n
Avantajlar:<\/strong><\/p>\n
1.  Geli\u015fmi\u015f G\u00fcvenlik:<\/strong> Kullan\u0131c\u0131lar\u0131n hassas verilere do\u011frudan eri\u015fimini engelleyerek sadece yetkili olduklar\u0131 verileri g\u00f6rmelerini sa\u011flar.
\n2.  Veri Basitle\u015ftirme:<\/strong> Karma\u015f\u0131k sorgular\u0131 soyutlayarak, son kullan\u0131c\u0131lara ve uygulamalara basitle\u015ftirilmi\u015f bir veri g\u00f6r\u00fcn\u00fcm\u00fc sunar.
\n3.  Veri Ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131:<\/strong> Temel tablo yap\u0131s\u0131ndaki de\u011fi\u015fikliklerden uygulamalar\u0131n daha az etkilenmesini sa\u011flar.
\n4.  Tutarl\u0131l\u0131k ve Tekrar Kullan\u0131labilirlik:<\/strong> S\u0131k kullan\u0131lan i\u015f mant\u0131\u011f\u0131n\u0131 veya hesaplamalar\u0131 bir kez tan\u0131mlay\u0131p birden \u00e7ok yerde yeniden kullanmay\u0131 sa\u011flar.
\n5.  Performans (Materialized View’lar i\u00e7in):<\/strong> Depolanm\u0131\u015f sonu\u00e7 setleri sayesinde \u00f6zellikle raporlama ve analitik sorgularda performans\u0131 art\u0131r\u0131r.<\/p>\n
Dezavantajlar:<\/strong><\/p>\n
1.  Performans Y\u00fck\u00fc (Standart View’lar i\u00e7in):<\/strong> Standart View’lar her \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda temel sorguyu yeniden \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131 i\u00e7in, karma\u015f\u0131k View’lar sorgu performans\u0131n\u0131 d\u00fc\u015f\u00fcrebilir. Veritaban\u0131 optimizat\u00f6r\u00fc View’\u0131 etkili bir \u015fekilde \u00e7\u00f6zemezse ek y\u00fck olu\u015fabilir.
\n2.  Ba\u011f\u0131ml\u0131l\u0131k Y\u00f6netimi:<\/strong> Temel tablolarda yap\u0131lan de\u011fi\u015fiklikler (s\u00fctun silme, isim de\u011fi\u015ftirme vb.), View’lar\u0131n bozulmas\u0131na neden olabilir. Bu ba\u011f\u0131ml\u0131l\u0131klar\u0131 y\u00f6netmek dikkat gerektirir.
\n3.  Hata Ay\u0131klama Zorlu\u011fu:<\/strong> \u00c7ok say\u0131da veya i\u00e7 i\u00e7e ge\u00e7mi\u015f View’lar, bir sorunun kayna\u011f\u0131n\u0131 bulmay\u0131 (hata ay\u0131klamay\u0131) zorla\u015ft\u0131rabilir.
\n4.  Karma\u015f\u0131kl\u0131k:<\/strong> A\u015f\u0131r\u0131 View kullan\u0131m\u0131 veya k\u00f6t\u00fc tasarlanm\u0131\u015f View’lar, veritaban\u0131 \u015femas\u0131n\u0131 gereksiz yere karma\u015f\u0131k hale getirebilir.
\n5.  G\u00fcncellenebilirlik S\u0131n\u0131rlamalar\u0131:<\/strong> \u00c7o\u011fu View, karma\u015f\u0131kl\u0131klar\u0131 nedeniyle g\u00fcncellenemez, bu da veri de\u011fi\u015ftirme i\u015flemlerinde View’lar\u0131n kullan\u0131m\u0131n\u0131 s\u0131n\u0131rlar.<\/p>\n
En \u0130yi Uygulamalar<\/h3>\n
View’lar\u0131 etkili ve verimli bir \u015fekilde kullanmak i\u00e7in baz\u0131 en iyi uygulamalar\u0131 takip etmek \u00f6nemlidir:<\/p>\n
*   Anlaml\u0131 \u0130simler Verin:<\/strong> View’lar\u0131n\u0131z i\u00e7in ama\u00e7lar\u0131n\u0131 a\u00e7\u0131k\u00e7a belirten ve anla\u015f\u0131lmas\u0131 kolay isimler kullan\u0131n (\u00f6rne\u011fin, V_AktifMusteriSiparisleri<\/code>, VW_SalesSummary<\/code>).
\n*   Tek Odakl\u0131 Olun:<\/strong> Her View’\u0131n tek bir mant\u0131ksal amaca hizmet etmesini sa\u011flay\u0131n. \u00c7ok fazla i\u015flevi tek bir View’da birle\u015ftirmekten ka\u00e7\u0131n\u0131n.
\n*   Gereksiz Karma\u015f\u0131kl\u0131ktan Ka\u00e7\u0131n\u0131n:<\/strong> M\u00fcmk\u00fcn oldu\u011funca basit View’lar olu\u015fturun. \u00c7ok karma\u015f\u0131k JOIN<\/code>‘ler, alt sorgular veya \u00e7ok say\u0131da hesaplanm\u0131\u015f s\u00fctun i\u00e7eren View’lar performans\u0131 olumsuz etkileyebilir.
\n*   WITH SCHEMABINDING<\/code> Kullan\u0131n (SQL Server):<\/strong> \u00d6zellikle View’\u0131n temel ald\u0131\u011f\u0131 tablolar\u0131n yap\u0131s\u0131n\u0131n de\u011fi\u015fmemesi gereken durumlarda bu se\u00e7ene\u011fi kullanarak View’\u0131n sa\u011flaml\u0131\u011f\u0131n\u0131 art\u0131r\u0131n.
\n*   WITH CHECK OPTION<\/code> Kullan\u0131n:<\/strong> E\u011fer View arac\u0131l\u0131\u011f\u0131yla veri ekleme veya g\u00fcncelleme yap\u0131l\u0131yorsa ve View’\u0131n WHERE<\/code> ko\u015fulunun korunmas\u0131 kritikse bu se\u00e7ene\u011fi mutlaka kullan\u0131n.
\n*   View’lar\u0131 \u0130\u00e7 \u0130\u00e7e Kullan\u0131rken Dikkatli Olun:<\/strong> \u0130\u00e7 i\u00e7e View’lar okunabilirli\u011fi art\u0131rabilir, ancak a\u015f\u0131r\u0131ya ka\u00e7mak performans\u0131 d\u00fc\u015f\u00fcrebilir ve hata ay\u0131klamay\u0131 zorla\u015ft\u0131rabilir. Derin View hiyerar\u015filerinden ka\u00e7\u0131n\u0131n.
\n*   Performans\u0131 \u0130zleyin:<\/strong> \u00d6zellikle s\u0131k kullan\u0131lan veya karma\u015f\u0131k View’lar\u0131n performans\u0131n\u0131 d\u00fczenli olarak izleyin. Gerekirse temel sorgular\u0131 optimize edin veya Materialized View’lar\u0131 de\u011ferlendirin.
\n*   Belgeleme Yap\u0131n:<\/strong> Karma\u015f\u0131k View’lar\u0131n amac\u0131n\u0131, temel ald\u0131\u011f\u0131 tablolar\u0131 ve i\u00e7erdi\u011fi i\u015f mant\u0131\u011f\u0131n\u0131 belgeleyin. Bu, gelecekteki bak\u0131m ve hata ay\u0131klama s\u00fcre\u00e7lerini kolayla\u015ft\u0131r\u0131r.
\n*   G\u00fcvenlik \u0130\u00e7in Kullan\u0131n:<\/strong> Kullan\u0131c\u0131lar\u0131n sadece ihtiya\u00e7 duyduklar\u0131 verilere eri\u015febilmelerini sa\u011flamak i\u00e7in View’lar\u0131 g\u00fcvenlik katman\u0131 olarak aktif bir \u015fekilde kullan\u0131n.<\/p>\n
Sonu\u00e7<\/h3>\n
SQL View’lar, veritaban\u0131 y\u00f6netiminde ve uygulama geli\u015ftirmede son derece g\u00fc\u00e7l\u00fc ve esnek ara\u00e7lard\u0131r. Veri g\u00fcvenli\u011fini art\u0131rma, karma\u015f\u0131kl\u0131\u011f\u0131 soyutlama, veri ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131 sa\u011flama ve (Materialized View’lar arac\u0131l\u0131\u011f\u0131yla) performans\u0131 iyile\u015ftirme gibi bir\u00e7ok avantaj sunarlar. Ancak, yanl\u0131\u015f veya a\u015f\u0131r\u0131 kullan\u0131ld\u0131\u011f\u0131nda performans sorunlar\u0131na, ba\u011f\u0131ml\u0131l\u0131k karma\u015fas\u0131na ve hata ay\u0131klama zorluklar\u0131na yol a\u00e7abilirler.<\/p>\n
Bu makalede ele al\u0131nan kavramlar\u0131 ve en iyi uygulamalar\u0131 takip ederek, View’lar\u0131 veritaban\u0131 projelerinizde etkin bir \u015fekilde kullanabilir, daha g\u00fcvenli, daha basit ve daha y\u00f6netilebilir bir veri eri\u015fim katman\u0131 olu\u015fturabilirsiniz. View’lar\u0131n g\u00fcc\u00fcn\u00fc do\u011fru bir \u015fekilde anlamak ve uygulamak, her veritaban\u0131 profesyonelinin ara\u00e7 kutusunda bulunmas\u0131 gereken \u00f6nemli bir beceridir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"SQL’de View’lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r?\nVeritaban\u0131 y\u00f6netim sistemlerinde (DBMS) veriler genellikle karma\u015f\u0131k yap\u0131lar, \u00e7ok say\u0131d","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":[1505],"tags":[],"class_list":{"0":"post-35242","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-sql-2","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nSQL'de View'lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r? - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\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\/sqlde-viewlari-gorunumleri-nasil-kullanilir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL'de View'lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r?\" \/>\n<meta property=\"og:description\" content=\"SQL'de View'lar\u0131 (G\u00f6r\u00fcn\u00fcmleri) Nas\u0131l Kullan\u0131l\u0131r? 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