{"id":181813,"date":"2024-03-13T07:25:00","date_gmt":"2024-03-13T06:25:00","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=181813"},"modified":"2024-03-07T20:29:23","modified_gmt":"2024-03-07T19:29:23","slug":"sql-triggers-automating-database-management-with-ease","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/sql-triggers-automating-database-management-with-ease","title":{"rendered":"SQL Triggers: Automating Database Management with Ease"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"181813\" class=\"elementor elementor-181813\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7da2d21 e-flex e-con-boxed e-con\" data-id=\"7da2d21\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1bf78de elementor-widget elementor-widget-heading\" data-id=\"1bf78de\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">Data experts and developers can use the TRIGGER SQL command to program instructions on their database according to certain events.<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c24998 elementor-widget elementor-widget-text-editor\" data-id=\"6c24998\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>How do you create a trigger? What are the different types of triggers? What are the advantages and disadvantages? DataScientest answers all your questions.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-be37036 e-flex e-con-boxed e-con\" data-id=\"be37036\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-94ae9e3 elementor-widget elementor-widget-heading\" data-id=\"94ae9e3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">What is a trigger?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-588badf elementor-widget elementor-widget-text-editor\" data-id=\"588badf\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A trigger is a <a href=\"https:\/\/datascientest.com\/en\/transactional-database-model-all-about-this-type-of-database\">database object<\/a> associated with a table. It executes a set of instructions when certain events take place. For example, the trigger may be triggered when a row is added to the table, or when a column is updated, and so on.<\/p><p>Whatever the event, the aim of this function is to automate various tasks within a <a href=\"https:\/\/datascientest.com\/en\/database-what-is-it\">Database Management System (DBMS).<\/a><\/p><p>Unlike most <strong>SQL commands,<\/strong> the trigger is not invoked directly. It depends on a third-party event. For this reason, the procedure is stored in the database until the event actually occurs. But this is not a traditional stored procedure. Firstly, because the trigger is not invoked or executed manually. Secondly, triggers cannot receive parameters. Finally, because a transaction cannot be validated or cancelled within a trigger.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc06842 elementor-widget elementor-widget-image\" data-id=\"dc06842\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/09\/trigger-sql-1.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d52186a elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"d52186a\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Training in SQL language<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3b2f844 e-flex e-con-boxed e-con\" data-id=\"3b2f844\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a19d452 elementor-widget elementor-widget-heading\" data-id=\"a19d452\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How do I create a trigger with SQL?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bb4491f elementor-widget elementor-widget-text-editor\" data-id=\"bb4491f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>You can use <strong>TRIGGER SQL<\/strong> by writing the syntax below:<\/p><pre><span style=\"font-weight: 400;\">CREATE TRIGGER trigger_name<\/span>\n<span style=\"font-weight: 400;\">{BEFORE | AFTER} {INSERT | <a href=\"https:\/\/datascientest.com\/en\/sql-update-update-data-with-this-command\">UPDATE<\/a>| DELETE}<\/span>\n<span style=\"font-weight: 400;\">ON table_name FOR EACH ROW<\/span>\n<span style=\"font-weight: 400;\">trigger_body;<\/span><\/pre>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a5bbeb7 elementor-widget elementor-widget-text-editor\" data-id=\"a5bbeb7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Each of these elements needs to be described:<\/p><ul><li><strong>CREATE TRIGGER trigger_name:<\/strong> this is where you send the TRIGGER request. This involves naming your trigger.<\/li><li><strong>{BEFORE | AFTER} :<\/strong> this concerns the temporality of the trigger. Will it take place before or after the event occurs?<\/li><li><strong>{INSERT | UPDATE| <a href=\"https:\/\/datascientest.com\/en\/sql-delete-how-do-i-use-this-query\">DELETE<\/a> }<\/strong> : this concerns the event. In this case, add, update or delete. Of course, any type of event is possible. <br \/>ON table_name: this is the database involved in the SQL TRIGGER request.<\/li><li><strong>FOR EACH ROW<\/strong>: specify the rows affected by the trigger.<br \/>trigger_body: this is the description of your trigger. What will happen if the event occurs?<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6085246 e-flex e-con-boxed e-con\" data-id=\"6085246\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f9f1930 elementor-widget elementor-widget-heading\" data-id=\"f9f1930\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">What are the different types of trigger?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ee0f19 elementor-widget elementor-widget-text-editor\" data-id=\"5ee0f19\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>There are 3 main categories of SQL triggers. Here&#8217;s what you need to know:<\/p><ul><li><strong>DDL triggers:<\/strong> DDL stands for Data Definition Language. Command events corresponding to DDL triggers activate this type of SQL trigger.<\/li><li><strong>For example:<\/strong> Create_table, Create_view, drop_table, Drop_view or Alter_table.<\/li><li><strong>DML triggers:<\/strong> DML stands for Data Manipulation Language. The associated events are insert_table, update_view, and delete_table. In this case, triggers are used to define data management and integrity rules.<\/li><li><strong>Logon triggers:<\/strong> these correspond to the creation of a user session with an instance of SQL Server.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6490058 elementor-widget elementor-widget-image\" data-id=\"6490058\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/09\/trigger-sql-2.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37d8c41 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"37d8c41\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Learn SQL language<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9fd582a e-flex e-con-boxed e-con\" data-id=\"9fd582a\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4fca2d8 elementor-widget elementor-widget-heading\" data-id=\"4fca2d8\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">What are the advantages and disadvantages of TRIGGER SQL queries?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e28d56a elementor-widget elementor-widget-heading\" data-id=\"e28d56a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-medium\">The benefits of triggers<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-900f9a7 elementor-widget elementor-widget-text-editor\" data-id=\"900f9a7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>SQL triggers<\/strong> are widely used in database management. There are several reasons for this:<\/p><ul><li><strong>Data integrity<\/strong>: triggers define rules for database objects. If these rules are not respected, triggers automatically undo the faulty modifications. Furthermore, before being integrated or updated, the data is always validated by the trigger, which checks that no rule prevents these modifications.<\/li><li><strong>Automation:<\/strong> triggers examine all DBMS data. When certain events occur, they make changes automatically, without any human intervention.<\/li><li><strong>Tracking:<\/strong> SQL triggers simplify record-keeping.<\/li><li><strong>Simplicity:<\/strong> triggers don&#8217;t need to be compiled in the database each time they are run. In doing so, they reduce code, improve SQL query performance and optimize labor time.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffb46f1 elementor-widget elementor-widget-heading\" data-id=\"ffb46f1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-medium\">The disadvantages of SQL triggers<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-377502b elementor-widget elementor-widget-text-editor\" data-id=\"377502b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Despite all the advantages mentioned above, SQL triggers also have a few limitations you should be aware of. <strong>Here they are:<\/strong><\/p><ul><li>Extended validations are only possible with triggers.<\/li><li>Because triggers are automated, users don&#8217;t know when they are executed. This can make problem-solving complex.<\/li><li>When many events occur at the same time, triggers can increase server load.<\/li><li><strong>CREATE TRIGGER<\/strong> can only be applied to a single table. If you want to use the same trigger for several tables, you&#8217;ll have to retype the syntax several times.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-665ebd4 e-flex e-con-boxed e-con\" data-id=\"665ebd4\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5fa384e elementor-widget elementor-widget-heading\" data-id=\"5fa384e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Join DataScientest to develop your skills with SQL<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a97ca8e elementor-widget elementor-widget-text-editor\" data-id=\"a97ca8e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>While <strong>SQL triggers<\/strong> are one of the must-have queries in the SQL language, they are far from the only one. There are also<strong> SELECT, DELETE, UPDATE<\/strong> commands&#8230; The possibilities are endless. So if you want to master your database to the full, it&#8217;s best to learn how to use these different SQL queries. That&#8217;s exactly what DataScientest training courses can do for you.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bfea4e9 elementor-widget elementor-widget-image\" data-id=\"bfea4e9\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/09\/trigger-sql-3.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-79533cd elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"79533cd\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Start your SQL training<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7827665 e-flex e-con-boxed e-con\" data-id=\"7827665\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Data experts and developers can use the TRIGGER SQL command to program instructions on their database according to certain events. How do you create a trigger? What are the different types of triggers? What are the advantages and disadvantages? DataScientest answers all your questions. What is a trigger? A trigger is a database object associated [&hellip;]<\/p>\n","protected":false},"author":67,"featured_media":181815,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2425],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL Triggers: Automating Database Management with Ease<\/title>\n<meta name=\"description\" content=\"Learn how to harness the power of SQL triggers to automate tasks within your Database Management System (DBMS). Explore the concept of triggers, their practical applications, and how they streamline processes for increased efficiency and productivity.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/datascientest.com\/en\/sql-triggers-automating-database-management-with-ease\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Triggers: Automating Database Management with Ease\" \/>\n<meta property=\"og:description\" content=\"Data experts and developers can use the TRIGGER SQL command to program instructions on their database according to certain events. 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