{"id":925,"date":"2026-04-02T15:46:15","date_gmt":"2026-04-02T15:46:15","guid":{"rendered":"https:\/\/forgefuse.wasmer.app\/?p=925"},"modified":"2026-04-02T15:46:15","modified_gmt":"2026-04-02T15:46:15","slug":"oracle-sql-certification-1z0-071-course-section-18-using-set-operators","status":"publish","type":"post","link":"https:\/\/www.forgefuse.net\/index.php\/oracle-sql-certification-1z0-071-course-section-18-using-set-operators\/","title":{"rendered":"Oracle SQL Certification 1Z0-071 Course | Section 18: Using SET Operators"},"content":{"rendered":"\n<p>These operators are essential for comparing datasets, removing duplicates, or merging data from multiple sources. Each lesson is accompanied by a video demonstration to help you understand these concepts in practice.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">What are SET Operators<\/h4>\n\n\n\n<p>In this lesson, we introduce the <strong>SET operators<\/strong> in Oracle SQL, which are different from the <code>SET<\/code> clause used in <code>UPDATE<\/code> statements. SET operators are used to combine results from multiple queries into one unified output.<\/p>\n\n\n\n<p>The main SET operators include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>UNION<\/strong> \u2013 Combines results and returns only distinct rows. Duplicates are automatically removed.<\/li>\n\n\n\n<li><strong>UNION ALL<\/strong> \u2013 Combines results but includes all rows, including duplicates.<\/li>\n\n\n\n<li><strong>INTERSECT<\/strong> \u2013 Returns only rows that exist in both queries.<\/li>\n\n\n\n<li><strong>MINUS<\/strong> \u2013 Returns rows from the first query that do not exist in the second query.<\/li>\n<\/ul>\n\n\n\n<p><strong>Important rules and limitations:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Each query must return the same number of columns.<\/li>\n\n\n\n<li>Corresponding columns must have compatible data types.<\/li>\n\n\n\n<li>LOB types such as <code>CLOB<\/code> and <code>BLOB<\/code> cannot be used with set operators.<\/li>\n\n\n\n<li>The <code>ORDER BY<\/code> clause can only appear after the last <code>SELECT<\/code> statement, not inside individual queries.<\/li>\n<\/ol>\n\n\n\n<p>SET operators are highly useful for comparing datasets, combining data from multiple sources, and eliminating duplicate rows.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"What are SET Operators - Oracle SQL Certification (1Z0-071) | Section 18, Video 1\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/ryeN3wzRcFc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Combining Multiple Queries \u2013 UNION<\/h4>\n\n\n\n<p>This lesson focuses on combining SQL queries using <strong>UNION<\/strong> and <strong>UNION ALL<\/strong>. We create two sample tables to explore how each operator handles duplicates.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>UNION<\/strong> removes duplicate rows and returns only distinct results.<\/li>\n\n\n\n<li><strong>UNION ALL<\/strong> preserves all rows, including duplicates.<\/li>\n<\/ul>\n\n\n\n<p>Understanding the difference between these operators is crucial for accurate data analysis and reporting.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Combining Multiple Queries - UNION - Oracle SQL Certification (1Z0-071) | Section 18, Video 2\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/Y1PNpkWxXKY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Combining More Queries \u2013 INTERSECT and MINUS<\/h4>\n\n\n\n<p>In this lesson, we cover <strong>INTERSECT<\/strong> and <strong>MINUS<\/strong> operators:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>INTERSECT<\/strong> returns only the rows that appear in both queries.<\/li>\n\n\n\n<li><strong>MINUS<\/strong> returns rows from the first query that do not exist in the second query.<\/li>\n<\/ul>\n\n\n\n<p>We use sample tables to demonstrate how these operators can efficiently filter and compare datasets, making it easier to extract the information you need.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Combining More Queries - INTERSECT, MINUS - Oracle SQL Certification (1Z0-071) | Section 18, Video 3\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/iUSoi4PBODU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Combining Multiple Queries \u2013 Advanced Combinations<\/h4>\n\n\n\n<p>This lesson teaches you how to combine multiple SQL queries using <strong>advanced combinations<\/strong> of set operators.<\/p>\n\n\n\n<p>You will learn to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mix <code>UNION<\/code>, <code>UNION ALL<\/code>, <code>INTERSECT<\/code>, and <code>MINUS<\/code>.<\/li>\n\n\n\n<li>Control operator precedence using brackets.<\/li>\n\n\n\n<li>Handle duplicates across multiple queries for precise results.<\/li>\n<\/ul>\n\n\n\n<p>Mastering these combinations is essential for writing complex queries that efficiently manipulate and merge data.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Combining Multiple Queries - Combinations - Oracle SQL Certification (1Z0-071) | Section 18, Video 4\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/rPCOlFudwms?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Ordering Results with SET Operators<\/h4>\n\n\n\n<p>Finally, this lesson explains how to <strong>order results<\/strong> when using set operators. Key points include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>ORDER BY<\/code> clause must follow the last query in a set operation.<\/li>\n\n\n\n<li>Using column aliases ensures consistent and error-free sorting.<\/li>\n\n\n\n<li>Understanding how ordering interacts with <code>UNION<\/code>, <code>INTERSECT<\/code>, and <code>MINUS<\/code> is important for accurate query results.<\/li>\n<\/ul>\n\n\n\n<p>Proper ordering helps present combined data clearly and logically.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Ordering with SET Operators - Oracle SQL Certification (1Z0-071) | Section 18, Video 5\" width=\"1290\" height=\"726\" src=\"https:\/\/www.youtube.com\/embed\/pRXAjViwoYo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>In this section, we dive into SQL SET operators, which allow you to combine results from multiple SELECT statements into a single output. <\/p>\n","protected":false},"author":1,"featured_media":926,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":0,"footnotes":""},"categories":[2,11,4],"tags":[7,13,12],"class_list":["post-925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-oracle-1z0-071-sql-course","category-videoandarticle","tag-1z0-071","tag-certification","tag-sql"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/posts\/925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/comments?post=925"}],"version-history":[{"count":0,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/posts\/925\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/media\/926"}],"wp:attachment":[{"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/media?parent=925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/categories?post=925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.forgefuse.net\/index.php\/wp-json\/wp\/v2\/tags?post=925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}