{"id":2871,"date":"2026-05-06T16:59:46","date_gmt":"2026-05-06T08:59:46","guid":{"rendered":"https:\/\/tekno.bali-island.com\/?p=2871"},"modified":"2026-05-06T16:59:50","modified_gmt":"2026-05-06T08:59:50","slug":"klausa-union-dan-operator-in-dalam-sql","status":"publish","type":"post","link":"https:\/\/tekno.bali-island.com\/ms\/articles\/klausa-union-dan-operator-in-dalam-sql\/","title":{"rendered":"Klausa UNION dan Operator IN dalam SQL"},"content":{"rendered":"\n<p>Dalam pengurusan pangkalan data menggunakan SQL, terdapat pelbagai fungsi yang memudahkan kita memanipulasi dan menarik data secara cekap. Dua daripadanya yang sering diandalkan oleh pembangun dan penganalisis data ialah klausa UNION dan operator IN. Berikut adalah panduan lengkap mengenai fungsi, syarat penggunaan, dan cara penulisan sintaksnya.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Klausa UNION<\/strong><\/h2>\n\n\n\n<p>Klausa&nbsp;<strong>UNION<\/strong>&nbsp;merupakan satu klausa dalam SQL yang digunakan untuk menggabungkan dua atau lebih hasil daripada pernyataan SELECT.<\/p>\n\n\n\n<p>Untuk menggunakan klausa ini, anda tidak boleh sewenang-wenangnya menggabungkan jadual. Terdapat peraturan tetap yang mesti dipenuhi agar pertanyaan tidak menghasilkan ralat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Setiap pernyataan SELECT yang digabungkan mesti mempunyai\u00a0<strong>bilangan lajur yang sama<\/strong>.<\/li>\n\n\n\n<li>Jenis data yang dimiliki oleh lajur-lajur yang bersesuaian mestilah\u00a0<strong>sama<\/strong>\u00a0atau serasi.<\/li>\n\n\n\n<li>Setiap lajur dalam pernyataan SELECT mestilah dalam\u00a0<strong>susunan yang sama<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Secara lalai, klausa UNION hanya akan memilih dan memaparkan nilai yang berbeza. Ini bermakna sistem akan menapis hasil secara automatik supaya&nbsp;<strong>tiada pertindihan data berlaku<\/strong>.<\/p>\n\n\n\n<p><strong>Sintaks UNION:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table1<\/p>\n\n\n\n<p>UNION<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table2;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Klausa UNION ALL<\/strong><\/h2>\n\n\n\n<p>Dalam keluarga UNION, terdapat juga variasi sintaks yang dikenali sebagai&nbsp;<strong>UNION ALL<\/strong>.<\/p>\n\n\n\n<p>Perbezaan utama antara kedua-duanya terletak pada cara sistem mengendalikan data yang berulang. Jika UNION menghapuskan pertindihan,&nbsp;<strong>UNION ALL membenarkan berlakunya pertindihan data<\/strong>. Klausa ini akan memaparkan semua baris hasil daripada setiap pernyataan SELECT yang digabungkan, tanpa mengira sama ada terdapat nilai yang sama persis atau tidak.<\/p>\n\n\n\n<p><strong>Sintaks UNION ALL:<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table1<\/p>\n\n\n\n<p>UNION ALL<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table2;<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Nota:<\/strong>&nbsp;Penggunaan UNION ALL biasanya lebih pantas berbanding UNION biasa kerana sistem pengkomputeran tidak perlu membuang masa tambahan untuk mengimbas dan memadam baris yang berulang.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Operator IN<\/strong><\/h2>\n\n\n\n<p><strong>Operator IN<\/strong>&nbsp;merupakan operator logik yang ditambahkan pada klausa WHERE untuk menapis data berdasarkan beberapa kemungkinan nilai sekaligus.<\/p>\n\n\n\n<p>Operator ini sering dikatakan sebagai kaedah&nbsp;<em>ringkasan<\/em>&nbsp;untuk menggantikan penggunaan operator OR yang berulang kali semasa membuat pemilihan pada beberapa syarat. Penggunaan IN menjadikan kod SQL jauh lebih kemas, ringkas, dan mudah dibaca.<\/p>\n\n\n\n<p><strong>Sintaks Operator IN (menggunakan senarai nilai spesifik):<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table_name<\/p>\n\n\n\n<p>WHERE column_name IN (value1, value2, &#8230;);<\/p>\n\n\n\n<p><strong>Sintaks Operator IN (menggunakan Subquery \/ pernyataan SELECT):<\/strong><br>Selain mendefinisikan nilai secara manual, anda juga boleh meletakkan pernyataan SELECT lain di dalam tanda kurung untuk menghasilkan senarai nilai secara dinamik.<\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT column_name(s) FROM table_name<\/p>\n\n\n\n<p>WHERE column_name IN (SELECT STATEMENT);<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dalam pengurusan pangkalan data menggunakan SQL, terdapat pelbagai fungsi yang memudahkan kita memanipulasi dan menarik data secara cekap. Dua daripadanya yang sering diandalkan oleh pembangun dan penganalisis data ialah klausa UNION dan operator IN. Berikut adalah panduan lengkap mengenai fungsi, syarat penggunaan, dan cara penulisan sintaksnya. Klausa UNION Klausa&nbsp;UNION&nbsp;merupakan satu klausa dalam SQL yang digunakan untuk menggabungkan dua atau lebih hasil daripada pernyataan SELECT. Untuk menggunakan klausa ini, anda tidak boleh sewenang-wenangnya menggabungkan jadual. Terdapat peraturan tetap yang mesti dipenuhi agar pertanyaan tidak menghasilkan ralat: Secara lalai, klausa UNION hanya akan memilih dan memaparkan nilai yang berbeza. Ini bermakna sistem akan menapis hasil secara automatik supaya&nbsp;tiada pertindihan data berlaku. Sintaks UNION: SQL SELECT column_name(s) FROM table1 UNION SELECT column_name(s) FROM table2; Klausa UNION ALL Dalam keluarga UNION, terdapat juga variasi sintaks yang dikenali sebagai&nbsp;UNION ALL. Perbezaan utama antara kedua-duanya terletak pada cara sistem mengendalikan data yang berulang. Jika UNION menghapuskan pertindihan,&nbsp;UNION ALL membenarkan berlakunya pertindihan data. Klausa ini akan memaparkan semua baris hasil daripada setiap pernyataan SELECT yang digabungkan, tanpa mengira sama ada terdapat nilai yang sama persis atau tidak. Sintaks UNION ALL: SQL SELECT column_name(s) FROM table1 UNION ALL SELECT column_name(s) FROM table2; Nota:&nbsp;Penggunaan UNION ALL biasanya lebih pantas &hellip;<\/p>\n","protected":false},"author":1,"featured_media":2853,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[99],"tags":[],"class_list":["post-2871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Klausa UNION dan Operator IN dalam SQL<\/title>\n<meta name=\"description\" content=\"Panduan penggunaan klausa UNION dan UNION ALL untuk menggabungkan data, serta cara cekap menggunakan operator IN dalam pertanyaan SQL\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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