{"id":135,"date":"2016-03-24T07:46:44","date_gmt":"2016-03-24T07:46:44","guid":{"rendered":"https:\/\/sqltutorial.org\/?page_id=135"},"modified":"2025-01-18T20:44:11","modified_gmt":"2025-01-19T03:44:11","slug":"sql-count","status":"publish","type":"page","link":"https:\/\/www.sqltutorial.org\/sql-aggregate-functions\/sql-count\/","title":{"rendered":"SQL COUNT Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL <code>COUNT<\/code> function to get the number of rows in a table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-sql-count-function'>Introduction to SQL COUNT function <a href=\"#introduction-to-sql-count-function\" class=\"anchor\" id=\"introduction-to-sql-count-function\" title=\"Anchor for Introduction to SQL COUNT function\">#<\/a><\/h2>\n\n\n\n<p>The SQL <code>COUNT<\/code> function is an <a href=\"https:\/\/www.sqltutorial.org\/sql-aggregate-functions\/\">aggregate function<\/a> that returns the number of rows returned by a query.<\/p>\n\n\n\n<p>For example, you can use the <code>COUNT<\/code> function in the <a href=\"https:\/\/www.sqltutorial.org\/sql-select\/\">SELECT statement<\/a> to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc.<\/p>\n\n\n\n<p>The following illustrates the syntax of the SQL <code>COUNT<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">COUNT(&#91;ALL | DISTINCT] expression);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The result of the <code>COUNT<\/code> function depends on the argument that you pass to it.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>ALL<\/code> keyword will include the duplicate values in the result. For example, if you have a group (1, 2, 3, 3, 4, 4) and apply the <code>COUNT<\/code> function, the result is 6. By default, the <code>COUNT<\/code> function uses the <code>ALL<\/code> keyword whether you specify it or not.<\/li>\n\n\n\n<li>The <code>DISTINCT<\/code> keyword counts only unique values. For example, the <code>COUNT<\/code> function returns 4 if you apply it to the group (1, 2, 3, 3, 4, 4).<\/li>\n\n\n\n<li>The expression is a column of a table where you want to count the value.<\/li>\n<\/ul>\n\n\n\n<p>Another form of the <code>COUNT<\/code> function that accepts an asterisk (*) as the argument is as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">COUNT(*)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>COUNT(*)<\/code> function returns the number of rows in a table in a query. It counts duplicate rows and rows that contain null values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-count-function-examples'>SQL COUNT function examples <a href=\"#sql-count-function-examples\" class=\"anchor\" id=\"sql-count-function-examples\" title=\"Anchor for SQL COUNT function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples to see how the <code>COUNT<\/code> function works. We will use the <code>employees<\/code> table in the sample database for demonstration purposes:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"273\" src=\"https:\/\/www.sqltutorial.org\/wp-content\/uploads\/2016\/03\/employees.png\" alt=\"employees_table\" class=\"wp-image-237\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='sql-count-examples'>SQL COUNT(*) examples <a href=\"#sql-count-examples\" class=\"anchor\" id=\"sql-count-examples\" title=\"Anchor for SQL COUNT(*) examples\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>COUNT(*)<\/code> function to get the number of rows from the <code>employees<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(*)\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKCopIEZST00gZW1wbG95ZWVzOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> count\n-------\n    40<\/code><\/span><\/pre>\n\n\n<p>The following example uses the <code>COUNT(*)<\/code> function to count employees who work in the department with id 6:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(*)\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees\n<span class=\"hljs-keyword\">WHERE<\/span>\n  department_id = <span class=\"hljs-number\">6<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKCopIEZST00gZW1wbG95ZWVzIFdIRVJFIGRlcGFydG1lbnRfaWQgPSA2Ow%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, the <code><a href=\"https:\/\/www.sqltutorial.org\/sql-where\/\">WHERE<\/a><\/code> clause filter department with id 6.<\/li>\n\n\n\n<li>Second, the <code>COUNT(*)<\/code> function returns the number of rows from the <code>employees<\/code> table with the value in the department id 6.<\/li>\n<\/ul>\n\n\n\n<p>The following example uses the <code>COUNT(*)<\/code> function to get the number of employees with the job id 9:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(*)\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees\n<span class=\"hljs-keyword\">WHERE<\/span>\n  job_id = <span class=\"hljs-number\">9<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKCopIEZST00gZW1wbG95ZWVzIFdIRVJFIGpvYl9pZCA9IDk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> count\n-------\n     5<\/code><\/span><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, the <code>WHERE<\/code> clause includes the rows from the <code>employees<\/code> table with the job id 9.<\/li>\n\n\n\n<li>Second, the <code>COUNT(*)<\/code> returns the number of rows from the <code>employees<\/code> table with the job id 9<\/li>\n<\/ul>\n\n\n\n<p>The following example uses the AS keyword to assign the <code>COUNT(*)<\/code> a column alias:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">SELECT\n  COUNT(*) <span class=\"hljs-keyword\">AS<\/span> employee_count\nFROM\n  employees\nWHERE\n  job_id = <span class=\"hljs-number\">9<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKCopIEFTIGVtcGxveWVlX2NvdW50IEZST00gZW1wbG95ZWVzIFdIRVJFIGpvYl9pZCA9IDk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> employee_count\n----------------\n              5<\/code><\/span><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='sql-count-with-group-by-clause-examples'>SQL COUNT with GROUP BY clause examples <a href=\"#sql-count-with-group-by-clause-examples\" class=\"anchor\" id=\"sql-count-with-group-by-clause-examples\" title=\"Anchor for SQL COUNT with GROUP BY clause examples\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>COUNT<\/code> function with <a href=\"https:\/\/www.sqltutorial.org\/sql-group-by\/\">GROUP BY<\/a> clause to find the number of employees for each department:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  department_id,\n  <span class=\"hljs-keyword\">COUNT<\/span>(*) employee_count\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  department_id\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  employee_count;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIGRlcGFydG1lbnRfaWQsIENPVU5UKCopIGVtcGxveWVlX2NvdW50IEZST00gZW1wbG95ZWVzIEdST1VQIEJZIGRlcGFydG1lbnRfaWQgT1JERVIgQlkgZW1wbG95ZWVfY291bnQ7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> department_id | employee_count\n---------------+----------------\n             7 |              1\n             4 |              1\n             1 |              1\n            11 |              2\n             2 |              2\n             9 |              3\n             6 |              5\n             8 |              6\n             3 |              6\n            10 |              6\n             5 |              7<\/code><\/span><\/pre>\n\n\n<p>How it works:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, the <code>GROUP BY<\/code> clause groups the rows in the <code>employees<\/code> table by the department id. <\/li>\n\n\n\n<li>Second, the <code>COUNT(*)<\/code> function returns the number of rows for each group<\/li>\n<\/ul>\n\n\n\n<p>The following example uses the <code>COUNT(*)<\/code> function to get the number of employees by department. Also, it uses an <code>INNER JOIN<\/code> clause to include the department name in the result set:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  department_name,\n  <span class=\"hljs-keyword\">COUNT<\/span>(*) employee_count\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees e\n  <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> departments d <span class=\"hljs-keyword\">ON<\/span> d.department_id = e.department_id\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  department_name\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  employee_count;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIGRlcGFydG1lbnRfbmFtZSwgQ09VTlQoKikgZW1wbG95ZWVfY291bnQgRlJPTSBlbXBsb3llZXMgZSBJTk5FUiBKT0lOIGRlcGFydG1lbnRzIGQgT04gZC5kZXBhcnRtZW50X2lkID0gZS5kZXBhcnRtZW50X2lkIEdST1VQIEJZIGRlcGFydG1lbnRfbmFtZSBPUkRFUiBCWSBlbXBsb3llZV9jb3VudDs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"> department_name  | employee_count\n------------------+----------------\n Administration   |              <span class=\"hljs-number\">1<\/span>\n Human Resources  |              <span class=\"hljs-number\">1<\/span>\n <span class=\"hljs-keyword\">Public<\/span> Relations |              <span class=\"hljs-number\">1<\/span>\n Accounting       |              <span class=\"hljs-number\">2<\/span>\n Marketing        |              <span class=\"hljs-number\">2<\/span>\n Executive        |              <span class=\"hljs-number\">3<\/span>\n IT               |              <span class=\"hljs-number\">5<\/span>\n Finance          |              <span class=\"hljs-number\">6<\/span>\n Purchasing       |              <span class=\"hljs-number\">6<\/span>\n Sales            |              <span class=\"hljs-number\">6<\/span>\n Shipping         |              <span class=\"hljs-number\">7<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='sql-count-with-having-clause-example'>SQL COUNT with HAVING clause example <a href=\"#sql-count-with-having-clause-example\" class=\"anchor\" id=\"sql-count-with-having-clause-example\" title=\"Anchor for SQL COUNT with HAVING clause example\">#<\/a><\/h3>\n\n\n\n<p>The following example returns the number of employees by department. Also, it uses a <code>HAVING<\/code> clause to select only departments that have more than five employees:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  department_name,\n  <span class=\"hljs-keyword\">COUNT<\/span>(*) employee_count\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees e\n  <span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> departments d <span class=\"hljs-keyword\">ON<\/span> d.department_id = e.department_id\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  department_name\n<span class=\"hljs-keyword\">HAVING<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(*) &gt; <span class=\"hljs-number\">5<\/span>\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  employee_count <span class=\"hljs-keyword\">DESC<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIGRlcGFydG1lbnRfbmFtZSwgQ09VTlQoKikgZW1wbG95ZWVfY291bnQgRlJPTSBlbXBsb3llZXMgZSBJTk5FUiBKT0lOIGRlcGFydG1lbnRzIGQgT04gZC5kZXBhcnRtZW50X2lkID0gZS5kZXBhcnRtZW50X2lkIEdST1VQIEJZIGRlcGFydG1lbnRfbmFtZSBIQVZJTkcgQ09VTlQoKikgPiA1IE9SREVSIEJZIGVtcGxveWVlX2NvdW50IERFU0M7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> department_name | employee_count\n-----------------+----------------\n Shipping        |              7\n Purchasing      |              6\n Finance         |              6\n Sales           |              6<\/code><\/span><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id='sql-countdistinct-expression-example'>SQL COUNT(DISTINCT expression) example <a href=\"#sql-countdistinct-expression-example\" class=\"anchor\" id=\"sql-countdistinct-expression-example\" title=\"Anchor for SQL COUNT(DISTINCT expression) example\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>COUNT<\/code> to get the number of values in the <code>job_id<\/code> column in the <code>employees<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(job_id)\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKGpvYl9pZCkgRlJPTSBlbXBsb3llZXM7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> count\n-------\n    40<\/code><\/span><\/pre>\n\n\n<p>The query returns 40 which includes the duplicate values. To remove the duplicates, you use the <code>DISTINCT<\/code> keyword to the <code>COUNT<\/code> function as follows:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">SELECT\n  COUNT(DISTINCT job_id)\nFROM\n  employees;<\/code><\/span><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKERJU1RJTkNUIGpvYl9pZCkgRlJPTSBlbXBsb3llZXM7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> count\n-------\n    19<\/code><\/span><\/pre>\n\n\n<p>The following example uses the <code>COUNT<\/code> function with the <code>DISTINCT<\/code> keyword to get the number of managers:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">COUNT<\/span>(<span class=\"hljs-keyword\">DISTINCT<\/span> manager_id)\n<span class=\"hljs-keyword\">FROM<\/span>\n  employees;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.sqltutorial.org\/playground\/?q=U0VMRUNUIENPVU5UKERJU1RJTkNUIG1hbmFnZXJfaWQpIEZST00gZW1wbG95ZWVzOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> count\n-------\n    10<\/code><\/span><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>COUNT<\/code> function returns the number of rows in a group.<\/li>\n\n\n\n<li>The <code>ALL<\/code> keyword includes duplicate values while the <code>DISTINCT<\/code> keyword removes the duplicate values in the result.<\/li>\n\n\n\n<li>The <code>COUNT(*)<\/code> returns the number of rows in a query including duplicate rows and rows that contain null values.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='databases'>Databases <a href=\"#databases\" class=\"anchor\" id=\"databases\" title=\"Anchor for Databases\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.pgtutorial.com\/postgresql-aggregate-functions\/postgresql-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">PostgreSQL COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.oracletutorial.com\/oracle-aggregate-functions\/oracle-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">Oracle COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-aggregate-functions\/sql-server-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">SQL Server COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mysqltutorial.org\/mysql-aggregate-functions\/mysql-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">MySQL COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-count-function\/\" target=\"_blank\" rel=\"noreferrer noopener\">SQLite COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.db2tutorial.com\/db2-aggregate-functions\/db2-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">Db2 COUNT function<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mariadbtutorial.com\/mariadb-aggregate-functions\/mariadb-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">MariaDB COUNT function<\/a><\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful 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