{"id":173545,"date":"2023-11-13T22:12:37","date_gmt":"2023-11-13T21:12:37","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=173545"},"modified":"2023-11-13T22:17:43","modified_gmt":"2023-11-13T21:17:43","slug":"count-function-in-sql-full-tutorial-on-this-formula","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/count-function-in-sql-full-tutorial-on-this-formula","title":{"rendered":"COUNT() function in SQL : Full tutorial on this formula"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"173545\" class=\"elementor elementor-173545\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-82a37d0 e-flex e-con-boxed e-con\" data-id=\"82a37d0\" 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-57d6e5c elementor-widget elementor-widget-heading\" data-id=\"57d6e5c\" 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\">Do you work with tables and want to know the number of elements in a column or with a filter? The COUNT() aggregation function in SQL can be used to count the number of records in a table. This function is particularly useful if you want to know the number of users online or the number of comments on a blog post. Frequently used by SQL users, find out more about the syntax and use cases of the COUNT() function.<\/h2>\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-eaf8c72 e-flex e-con-boxed e-con\" data-id=\"eaf8c72\" 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-49fd090 elementor-widget elementor-widget-heading\" data-id=\"49fd090\" 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\">SQL COUNT() syntax<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c84dec2 elementor-widget elementor-widget-text-editor\" data-id=\"c84dec2\" 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>There are several ways of using the COUNT function in an <a href=\"https:\/\/datascientest.com\/en\/sql-learn-all-about-the-programming-language-for-databases\">SQL query.<\/a> The first is to find out the total number of rows, zero or not:<\/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-fef3fdc elementor-widget elementor-widget-heading\" data-id=\"fef3fdc\" 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-default\">SELECT COUNT(*) FROM table<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27f124d elementor-widget elementor-widget-text-editor\" data-id=\"27f124d\" 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>Next, you can obtain the total number of elements in a particular column. For this function, records with a zero value will not be counted. For a column named &#8220;column_name&#8221;, here&#8217;s the syntax for counting the records:<\/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-34dc8a3 elementor-widget elementor-widget-heading\" data-id=\"34dc8a3\" 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-default\">SELECT COUNT(nom_colonne) FROM table<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-84867ca elementor-widget elementor-widget-text-editor\" data-id=\"84867ca\" 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>The last syntax of COUNT allows unique elements to be counted for a column. This means that duplicates do not affect the result of the function for the selected column. For a column named &#8220;column_name&#8221;, the syntax for counting the number of unique values is as follows:<\/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-3d247c1 elementor-widget elementor-widget-heading\" data-id=\"3d247c1\" 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-default\">SELECT COUNT(DISTINCT nom_colonne) FROM table<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ad77eb elementor-widget elementor-widget-text-editor\" data-id=\"0ad77eb\" 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><span style=\"font-weight: 400;\">To optimise the readability of the results, you can filter the rows using GROUP BY. The function returns the number of rows in each group. Note that duplicates and null values are counted.<\/span><\/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-d8f0b9f elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"d8f0b9f\" 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\/formation-sql\">\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\">Devenir un expert sur SQL <\/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-d9df13f e-flex e-con-boxed e-con\" data-id=\"d9df13f\" 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-9b50a93 elementor-widget elementor-widget-heading\" data-id=\"9b50a93\" 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\">Comment est utilis\u00e9 la fonction COUNT() ? <\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-becd2a8 elementor-widget elementor-widget-text-editor\" data-id=\"becd2a8\" 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><span style=\"font-weight: 400;\">Depending on how the COUNT() function is used, the results are different. Find out how to use it, depending on your specific use case.<\/span><\/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-85edb8e elementor-widget elementor-widget-heading\" data-id=\"85edb8e\" 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-default\">Using COUNT(*)<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-874a038 elementor-widget elementor-widget-text-editor\" data-id=\"874a038\" 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>Let&#8217;s say you work for a company called FinanceIncorporation. You are looking for the total number of employees in the organisation. This is where the COUNT() function comes in handy.<\/p><p>SELECT COUNT(*)<\/p><p>FROM HumanResources.Employees;<\/p><p>The results will be :<\/p><p>&#8212;&#8212;&#8212;&#8211;<\/p><p>490<\/p><p>(1 row(s) affected)<\/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-938267c elementor-widget elementor-widget-heading\" data-id=\"938267c\" 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-default\">Using COUNT() with GROUP BY<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4837f65 elementor-widget elementor-widget-text-editor\" data-id=\"4837f65\" 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>If your table contains a column called &#8216;department&#8217; categorising each person by department within the company. By using the GROUP BY clause, you can obtain the number of employees per department. The query would then take the following form<\/p><p>SELECT COUNT(*)<\/p><p>FROM HumanResources.Employees;<\/p><p>GROUP BY department;<\/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-e405a38 elementor-widget elementor-widget-heading\" data-id=\"e405a38\" 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-default\">Using COUNT() with WHERE<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eaf1bd4 elementor-widget elementor-widget-image\" data-id=\"eaf1bd4\" 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\/01\/sql.png\" 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-f157f26 elementor-widget elementor-widget-text-editor\" data-id=\"f157f26\" 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><span style=\"font-weight: 400;\">Pour rester dans les exemples de <strong>FinaceIncorporation,<\/strong> disons que tu souhaites trouver le nombre de vendeurs qui ont vendu pour plus de 25 000 \u20ac de logiciels. La requ\u00eate prendrait alors la forme suivante :<\/span><\/p><pre style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">SELECT COUNT(*)<\/span><\/pre><p><span style=\"font-weight: 400;\">FROM Ventes.Vendeurs<\/span><\/p><p><span style=\"font-weight: 400;\">WHERE SalesValue &amp;gt ; 25000;<\/span><\/p><p><b>Ici, l&#8217;instruction WHERE permet d&#8217;appliquer un filtre aux enregistrements Where applique un filtre aux enregistrements<\/b><span style=\"font-weight: 400;\">, pr\u00e9cisant ainsi les r\u00e9sultats de ta requ\u00eate. <\/span><i><span style=\"font-weight: 400;\">Une autre instruction facultative tr\u00e8s pratique est ORDER BY. Cette expression permet d&#8217;afficher les r\u00e9sultats de la requ\u00eate dans un ordre donn\u00e9.<\/span><\/i><\/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-c5df5af elementor-widget elementor-widget-heading\" data-id=\"c5df5af\" 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-default\">Using COUNT(column)<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1a3c57e elementor-widget elementor-widget-text-editor\" data-id=\"1a3c57e\" 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><span style=\"font-weight: 400;\">Another method allows you to count the number of registered users on an e-commerce site who have made a purchase. Let&#8217;s say you have a &#8220;id_achats&#8221; table. If there are no purchases, the <strong>value is zero<\/strong> and will not be counted. The query would therefore take the following form:<\/span><\/p><pre style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">SELECT COUNT(last_purchase_id) FROM user<\/span><\/pre>\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-f1cfc46 e-flex e-con-boxed e-con\" data-id=\"f1cfc46\" 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-209478c elementor-widget elementor-widget-heading\" data-id=\"209478c\" 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\">Is it possible to have several COUNT() in a single SQL query?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad86d6d elementor-widget elementor-widget-text-editor\" data-id=\"ad86d6d\" 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<span style=\"font-weight: 400;\">During a project, you may encounter a situation in which you have to <\/span><b>make several calls to a database<\/b><span style=\"font-weight: 400;\">. Nevertheless, this is still time-consuming and for best performance, <\/span><b>it&#8217;s best to reduce these calls<\/b><span style=\"font-weight: 400;\">. <\/span>\n\n\n<span style=\"font-weight: 400;\">Rather than making 3 successive requests:<\/span>\n<pre style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">SELECT COUNT(*) FROM table1;<\/span><\/pre>\n<span style=\"font-weight: 400;\">SELECT COUNT(*) FROM table2;<\/span>\n\n\n<span style=\"font-weight: 400;\">SELECT COUNT(*) FROM table2 WHERE is_valid = 1;<\/span>\n\n\n<span style=\"font-weight: 400;\">You can <\/span><b>group these queries into one<\/b><span style=\"font-weight: 400;\"> to return a record containing the values count1, count2 and count3: <\/span>\n<pre style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">SELECT<\/span><\/pre>\n<span style=\"font-weight: 400;\">(SELECT COUNT(*) FROM table1) as count1,<\/span>\n\n\n<span style=\"font-weight: 400;\">(SELECT COUNT(*) FROM table2) as count2,<\/span>\n\n\n<span style=\"font-weight: 400;\">(SELECT COUNT(*) FROM table2 WHERE is_valid = 1) as count3<\/span>\n\n\n<span style=\"font-weight: 400;\">Grouping several queries into one is a useful feature when you want to count the number of registered members, logged in, the number of visitors online or even a member&#8217;s unread messages and notifications. <\/span>\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-5ee0163 e-flex e-con-boxed e-con\" data-id=\"5ee0163\" 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-3db63ab elementor-widget elementor-widget-heading\" data-id=\"3db63ab\" 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\">Conclusion on the use of COUNT() in SQL<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7d2965 elementor-widget elementor-widget-text-editor\" data-id=\"c7d2965\" 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>The COUNT() aggregation function is used to count the number of records in a table. Thanks to its syntax with WHERE and COUNT(DISTINCT), it is possible to obtain the number of records with a more precise query, making the result easier to read. Finally, several COUNT() queries can be grouped together to <strong>optimise performance and avoid repetitive calls.<\/strong><\/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-8ed9c44 e-flex e-con-boxed e-con\" data-id=\"8ed9c44\" 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-6985e0f elementor-widget elementor-widget-text-editor\" data-id=\"6985e0f\" 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>If you&#8217;d like to <a href=\"https:\/\/datascientest.com\/en\/like-sql-how-to-use-this-search-function\">find out more about SQL,<\/a> read our full <a href=\"https:\/\/datascientest.com\/en\/all-about-non-relational-databases\">report on the subject.<\/a> Alternatively, learn how to master this relational database query language through one of the training courses by DataScientest.<\/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-6e60363 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"6e60363\" 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\">Find out more about SQL training from DataScientest<\/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\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Do you work with tables and want to know the number of elements in a column or with a filter? The COUNT() aggregation function in SQL can be used to count the number of records in a table. This function is particularly useful if you want to know the number of users online or the [&hellip;]<\/p>\n","protected":false},"author":67,"featured_media":173547,"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>COUNT() function in SQL : Full tutorial on this formula<\/title>\n<meta name=\"description\" content=\"Master the art of data counting with our comprehensive tutorial on the SQL COUNT() function in SQL.\" \/>\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\/count-function-in-sql-full-tutorial-on-this-formula\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"COUNT() function in SQL : Full tutorial on this formula\" \/>\n<meta property=\"og:description\" content=\"Do you work with tables and want to know the number of elements in a column or with a filter? 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