{"id":25728,"date":"2025-07-12T15:15:19","date_gmt":"2025-07-12T12:15:19","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-string-sutunlarinda-between-klauzu-nasil-kullanilir\/"},"modified":"2025-07-12T15:15:19","modified_gmt":"2025-07-12T12:15:19","slug":"postgresql-string-sutunlarinda-between-klauzu-nasil-kullanilir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-string-sutunlarinda-between-klauzu-nasil-kullanilir\/","title":{"rendered":"PostgreSQL: String S\u00fctunlar\u0131nda BETWEEN Klauzu Nas\u0131l Kullan\u0131l\u0131r"},"content":{"rendered":"<p># PostgreSQL&#8217;de BETWEEN Operat\u00f6r\u00fcn\u00fc String Kolonlarda Kullanmak<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda metin verilerini filtrelemek mi istiyorsunuz?  <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fc, say\u0131sal verilerle \u00e7al\u0131\u015f\u0131rken olduk\u00e7a kullan\u0131\u015fl\u0131d\u0131r ancak metin verileriyle kullan\u0131m\u0131 biraz farkl\u0131l\u0131k g\u00f6sterir.  Bu makalede, PostgreSQL&#8217;de <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fcn\u00fc string kolonlarda nas\u0131l kullanaca\u011f\u0131n\u0131z\u0131, olas\u0131 tuzaklar\u0131 ve performans optimizasyon tekniklerini ad\u0131m ad\u0131m \u00f6\u011freneceksiniz.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar geni\u015f bir yelpazede bilgi edinecek ve ger\u00e7ek d\u00fcnya senaryolar\u0131na dayal\u0131 \u00f6rneklerle pratik becerilerinizi geli\u015ftireceksiniz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong> Ad\u0131m ad\u0131m a\u00e7\u0131klama, basit kod \u00f6rne\u011fi<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek hayat \u00f6rne\u011fi, optimizasyon ipu\u00e7lar\u0131<\/p>\n<p><strong>\u0130leri Seviye:<\/strong> Performans analizi, edge case&#8217;ler<\/p>\n<p><strong>PostgreSQL&#8217;de BETWEEN Operat\u00f6r\u00fcn\u00fcn Temelleri<\/strong><\/p>\n<p><code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fc, belirli bir aral\u0131ktaki de\u011ferleri se\u00e7mek i\u00e7in kullan\u0131l\u0131r.  Say\u0131sal verilerde kullan\u0131m\u0131 olduk\u00e7a basittir: <code class=\"language-\">BETWEEN 10 AND 20<\/code>, 10 ile 20 (dahil) aras\u0131ndaki t\u00fcm say\u0131lar\u0131 se\u00e7er.  Ancak string verilerde, kar\u015f\u0131la\u015ft\u0131rma leksikografik (s\u00f6zl\u00fck s\u0131ras\u0131) olarak yap\u0131l\u0131r.  Bu,  &#8220;Ankara&#8221; &#8220;\u0130stanbul&#8221;dan \u00f6nce gelece\u011fi anlam\u0131na gelir \u00e7\u00fcnk\u00fc alfabetik s\u0131raya g\u00f6re kar\u015f\u0131la\u015ft\u0131rma yap\u0131l\u0131r.  Bu nedenle, <code class=\"language-\">BETWEEN 'A' AND 'Z'<\/code> ifadesi, &#8216;A&#8217; ile &#8216;Z&#8217; aras\u0131ndaki t\u00fcm harfleri *alfabetik s\u0131raya g\u00f6re* se\u00e7er.  B\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyarl\u0131l\u0131\u011f\u0131 da \u00f6nemlidir; &#8216;a&#8217; &#8216;A&#8217;dan farkl\u0131d\u0131r.<\/p>\n<p><strong>String Kolonlarda BETWEEN Kullan\u0131m\u0131: Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>Bir kitap\u00e7\u0131 veritaban\u0131 d\u00fc\u015f\u00fcnelim.  Kitaplar\u0131n ba\u015fl\u0131klar\u0131n\u0131 i\u00e7eren bir &#8220;baslik&#8221; s\u00fctunumuz olsun.  &#8220;K&#8221; ile ba\u015flayan kitaplar\u0131 se\u00e7mek istiyoruz.<\/p>\n<p><strong>1. Basit \u00d6rnek:<\/strong><\/p>\n<pre class=\"language-sql\"><code>SELECT baslik\nFROM kitaplar\nWHERE baslik BETWEEN 'K%' AND 'K~';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">baslik<\/code> s\u00fctununda <code class=\"language-\">K<\/code> ile ba\u015flayan t\u00fcm kitaplar\u0131 se\u00e7er.  <code class=\"language-\">%<\/code> ve <code class=\"language-\">~<\/code> wildcard karakterleri, leksikografik s\u0131rada &#8216;K&#8217; ile ba\u015flayan t\u00fcm stringleri kapsamak i\u00e7in kullan\u0131l\u0131r.  Ancak, bu yakla\u015f\u0131m t\u00fcm dillerdeki karakter setleri i\u00e7in g\u00fcvenilir olmayabilir.  \u00d6rne\u011fin, T\u00fcrk\u00e7e karakterler i\u00e7in beklenmedik sonu\u00e7lar verebilir.<\/p>\n<p><strong>2. Daha G\u00fcvenilir Yakla\u015f\u0131m (LIKE kullan\u0131m\u0131):<\/strong><\/p>\n<p><code class=\"language-\">BETWEEN<\/code> yerine <code class=\"language-\">LIKE<\/code> operat\u00f6r\u00fcn\u00fc kullanmak, \u00f6zellikle T\u00fcrk\u00e7e karakterler gibi geni\u015f karakter setleri i\u00e7eren veritabanlar\u0131nda daha g\u00fcvenilir sonu\u00e7lar sa\u011flar.<\/p>\n<pre class=\"language-sql\"><code>SELECT baslik\nFROM kitaplar\nWHERE baslik LIKE 'K%';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">baslik<\/code> s\u00fctununda <code class=\"language-\">K<\/code> ile ba\u015flayan t\u00fcm kitaplar\u0131 se\u00e7er ve wildcard karakteri (<code class=\"language-\">%<\/code>) sayesinde <code class=\"language-\">K<\/code> ile ba\u015flayan t\u00fcm kelimeleri kapsar. Bu y\u00f6ntem, <code class=\"language-\">BETWEEN<\/code>&#8216;in leksikografik s\u0131n\u0131rlamalar\u0131ndan ka\u00e7\u0131narak daha do\u011fru sonu\u00e7lar verir.<\/p>\n<p><strong>Ger\u00e7ek Hayat \u00d6rne\u011fi: \u00dcr\u00fcn Ad\u0131 Filtreleme<\/strong><\/p>\n<p>Bir e-ticaret sitesinin \u00fcr\u00fcn veritaban\u0131n\u0131 ele alal\u0131m.  \u00dcr\u00fcn adlar\u0131n\u0131 i\u00e7eren bir &#8220;urun_adi&#8221; s\u00fctunu olsun.  Kullan\u0131c\u0131 &#8220;Telefon&#8221; ile ba\u015flayan \u00fcr\u00fcnleri aramak istiyor.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, fiyat\nFROM urunler\nWHERE urun_adi LIKE 'Telefon%';<\/code><\/pre>\n<p>Bu sorgu, &#8220;Telefon&#8221; ile ba\u015flayan t\u00fcm \u00fcr\u00fcnlerin ad\u0131n\u0131 ve fiyat\u0131n\u0131 getirir.  <code class=\"language-\">LIKE<\/code> operat\u00f6r\u00fc,  <code class=\"language-\">BETWEEN<\/code>&#8216;den daha esnek ve g\u00fcvenilir bir \u00e7\u00f6z\u00fcm sunar.<\/p>\n<p><strong>Performans Optimizasyonu: \u0130ndeks Kullan\u0131m\u0131<\/strong><\/p>\n<p>B\u00fcy\u00fck veritabanlar\u0131nda, <code class=\"language-\">LIKE<\/code> operat\u00f6r\u00fcn\u00fc kullan\u0131rken performans d\u00fc\u015f\u00fc\u015fleri ya\u015fanabilir.  \u00d6zellikle wildcard karakteri (<code class=\"language-\">%<\/code>) ba\u015fta kullan\u0131l\u0131yorsa (\u00f6rne\u011fin, <code class=\"language-\">'%Telefon%'<\/code>), indeks kullan\u0131m\u0131 engellenir ve tam tablo taramas\u0131 gerekebilir.  Bu sorunu \u00e7\u00f6zmek i\u00e7in, uygun indeksler olu\u015fturmak \u00f6nemlidir.<\/p>\n<pre class=\"language-sql\"><code>CREATE INDEX urun_adi_idx ON urunler (urun_adi);<\/code><\/pre>\n<p>Bu komut, <code class=\"language-\">urun_adi<\/code> s\u00fctunu \u00fczerinde bir indeks olu\u015fturur.  \u0130ndeks, <code class=\"language-\">LIKE<\/code> sorgular\u0131n\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.  Ancak, <code class=\"language-\">%<\/code> karakteri ba\u015fta kullan\u0131l\u0131yorsa, indeks yine de tam verimlilikte \u00e7al\u0131\u015fmayabilir.<\/p>\n<p><strong>\u0130leri Seviye Teknikler: Collation ve Karakter Setleri<\/strong><\/p>\n<p>PostgreSQL&#8217;de, farkl\u0131 diller i\u00e7in farkl\u0131 collation (s\u0131ralama) ayarlar\u0131 mevcuttur.  <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fcn\u00fc kullan\u0131rken, collation ayarlar\u0131n\u0131n leksikografik kar\u015f\u0131la\u015ft\u0131rmay\u0131 nas\u0131l etkiledi\u011fini anlamak \u00f6nemlidir.  Yanl\u0131\u015f collation ayarlar\u0131, beklenmedik sonu\u00e7lara yol a\u00e7abilir.  Do\u011fru collation ayarlar\u0131n\u0131 se\u00e7mek i\u00e7in, veritaban\u0131n\u0131z\u0131n karakter setini ve dilini dikkate alman\u0131z gerekir.<\/p>\n<p><strong>Edge Case&#8217;ler ve Potansiyel Sorunlar<\/strong><\/p>\n<p><code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fcn\u00fc string kolonlarda kullan\u0131rken dikkat edilmesi gereken baz\u0131 noktalar vard\u0131r:<\/p>\n<p>* <strong>B\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyarl\u0131l\u0131\u011f\u0131:<\/strong>  <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fc b\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyarl\u0131d\u0131r.  B\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyars\u0131z bir kar\u015f\u0131la\u015ft\u0131rma i\u00e7in, <code class=\"language-\">ILIKE<\/code> operat\u00f6r\u00fcn\u00fc kullan\u0131n.<br \/>\n* <strong>\u00d6zel karakterler:<\/strong> \u00d6zel karakterler, leksikografik kar\u015f\u0131la\u015ft\u0131rmay\u0131 etkileyebilir.  \u00d6zel karakterlerin nas\u0131l s\u0131ralanaca\u011f\u0131n\u0131 anlamak \u00f6nemlidir.<br \/>\n* <strong>Unicode karakterleri:<\/strong> Unicode karakterleri i\u00e7eren veritabanlar\u0131nda, do\u011fru collation ayarlar\u0131n\u0131 se\u00e7mek kritik \u00f6neme sahiptir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de <code class=\"language-\">BETWEEN<\/code> operat\u00f6r\u00fcn\u00fc string kolonlarda kullan\u0131rken dikkatli olmak gerekir.  <code class=\"language-\">LIKE<\/code> operat\u00f6r\u00fc, \u00f6zellikle T\u00fcrk\u00e7e gibi geni\u015f karakter setlerini i\u00e7eren veritabanlar\u0131nda daha g\u00fcvenilir ve esnek bir alternatif sunar.  Performans optimizasyonu i\u00e7in uygun indeksler olu\u015fturmak ve do\u011fru collation ayarlar\u0131n\u0131 kullanmak \u00f6nemlidir.  Bu makalede ele al\u0131nan \u00f6rnekler ve ipu\u00e7lar\u0131, PostgreSQL&#8217;de string verileri filtrelemede daha etkili ve performansl\u0131 sorgular yazman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">BETWEEN<\/code> yerine <code class=\"language-\">LIKE<\/code> kullanman\u0131n avantajlar\u0131 nelerdir?<\/strong>  <code class=\"language-\">LIKE<\/code>, \u00f6zellikle wildcard karakterleri kullan\u0131rken daha esnektir ve farkl\u0131 karakter setleriyle daha uyumludur.<br \/>\n2. <strong>String kolonlarda indeks olu\u015fturman\u0131n \u00f6nemi nedir?<\/strong> \u0130ndeksler, b\u00fcy\u00fck veritabanlar\u0131nda <code class=\"language-\">LIKE<\/code> sorgular\u0131n\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r.<br \/>\n3. <strong><code class=\"language-\">ILIKE<\/code> operat\u00f6r\u00fc ne i\u015fe yarar?<\/strong> <code class=\"language-\">ILIKE<\/code>, b\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyars\u0131z bir kar\u015f\u0131la\u015ft\u0131rma yapar.<br \/>\n4. <strong>Collation ayarlar\u0131 neden \u00f6nemlidir?<\/strong>  Collation ayarlar\u0131, leksikografik kar\u015f\u0131la\u015ft\u0131rmay\u0131 etkiler ve yanl\u0131\u015f ayarlar beklenmedik sonu\u00e7lara yol a\u00e7abilir.<br \/>\n5. <strong>Wildcard karakterleri nas\u0131l kullan\u0131l\u0131r?<\/strong> <code class=\"language-\">%<\/code> herhangi bir karakter dizisini, <code class=\"language-\">_<\/code> ise tek bir karakteri temsil eder.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de BETWEEN Operat\u00f6r\u00fcn\u00fc String Kolonlarda Kullanmak PostgreSQL veritaban\u0131n\u0131zda metin verilerini filtrelemek mi istiyorsunuz? BETWEEN operat\u00f6r\u00fc, say\u0131sal verilerle&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-25728","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: String S\u00fctunlar\u0131nda BETWEEN Klauzu Nas\u0131l Kullan\u0131l\u0131r<\/title>\n<meta name=\"description\" content=\"Hi\u00e7bir etiketi bulunamad\u0131.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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