{"id":104122,"date":"2021-08-12T11:00:00","date_gmt":"2021-08-12T08:00:00","guid":{"rendered":"https:\/\/examples.javacodegeeks.com\/?p=104122"},"modified":"2022-01-04T11:21:51","modified_gmt":"2022-01-04T09:21:51","slug":"sql-is-null-sql-is-not-null","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/sql-is-null-sql-is-not-null\/","title":{"rendered":"SQL is null &#8211; SQL is not null"},"content":{"rendered":"<p>In this article, we&#8217;re going to see how to test null values in an SQL database.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-1-what-is-a-null-value\">1. What is a NULL Value?<\/h2>\n<p>Basically, a field with a NULL value in a SQL table is a field without value. When creating a table, we can mark a column that accepts null values when inserting data into the table. <\/p>\n<p>A null value is different from a zero value or a field that contains only spaces (a.k.a. blank field). Further, we can put or not a value for that during the record creation in the table.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><a href=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg\" alt=\"sql not null\" class=\"wp-image-1204\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg 150w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo-70x70.jpg 70w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\" id=\"h-2-how-to-test-for-null-values\">2. How to Test for NULL Values?<\/h2>\n<p>We can&#8217;t use the <a href=\"https:\/\/docs.oracle.com\/cd\/B19306_01\/server.102\/b14200\/intro.htm#:~:text=Structured%20Query%20Language%20(SQL)%20is,when%20executing%20the%20user's%20request.\">SQL<\/a> comparison operators such as = (equal), &lt; (less than), &gt;(greater than) or &lt;&gt; (not equal).<\/p>\n<p>To test NULL values in SQL, we use the <code>IS NULL<\/code> and <code>IS NOT NULL<\/code> operators. The use of these operators is pretty simple as we see below:<\/p>\n<p><span style=\"text-decoration: underline\"><em>IS NULL operator syntax<\/em><\/span><\/p>\n<pre class=\"brush:sql\">SELECT column_names\nFROM table_name\nWHERE column_name IS NULL;\n<\/pre>\n<p><span style=\"text-decoration: underline\"><em>IS NOT NULL operator syntax<\/em><\/span><div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\"brush:sql\">SELECT column_names\nFROM table_name\nWHERE column_name IS NOT NULL;\n<\/pre>\n<h2 class=\"wp-block-heading\" id=\"h-3-the-is-null-operator\">3. The IS NULL Operator<\/h2>\n<p>Let&#8217;s do a practical exercise. Below, I created a simple table called &#8220;Customers&#8221; and added some data to it.<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<tbody>\n<tr>\n<td><strong>CustomerID<\/strong><\/td>\n<td><strong>CustomerName<\/strong><\/td>\n<td><strong>ContactName<\/strong><\/td>\n<td><strong>Address<\/strong><\/td>\n<td><strong>City<\/strong><\/td>\n<td><strong>PostalCode<\/strong><\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>Tamba Bay Buccaneers<\/td>\n<td>Tom Brady<\/td>\n<td>1 Buccaneer Place<\/td>\n<td>Tampa, FL<\/td>\n<td>33607<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>New England Patriots<\/td>\n<td>NULL<\/td>\n<td>1 Patriots Place<\/td>\n<td>Foxborough, MA<\/td>\n<td>02035<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Dallas Cowboys<\/td>\n<td>Dak Prescott<\/td>\n<td>1 Cowboys Way&nbsp;Suite 100<\/td>\n<td>Frisco, TX<\/td>\n<td>75034<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>Kansas City Chiefs<\/td>\n<td>Patrick Mahomes<\/td>\n<td>1 Arrowhead Drive<\/td>\n<td>Kansas City, MO<\/td>\n<td>64129<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>New Orleans Saints<\/td>\n<td>NULL<\/td>\n<td>5800 Airline Drive<\/td>\n<td>Metairie,&nbsp;LA<\/td>\n<td>70003<\/td>\n<\/tr>\n<\/tbody>\n<\/table><figcaption>Customer table example<\/figcaption><\/figure>\n<p>Using <code>IS NULL<\/code> operator will test for empty values. The following query lists all customers with a NULL value in &#8220;ContactName&#8221;:<\/p>\n<p><span style=\"text-decoration: underline\"><em>IS NULL operator example<\/em><\/span><\/p>\n<pre class=\"brush:sql\">SELECT CustomerName, ContactName, City\nFROM Customers\nWHERE ContactName IS NULL;\n<\/pre>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_null.png\"><img decoding=\"async\" width=\"400\" height=\"200\" src=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_null.png\" alt=\"\" class=\"wp-image-104147\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_null.png 400w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_null-300x150.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><figcaption>IS NULL query result<\/figcaption><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\" id=\"h-4-the-is-not-null-operator\">4. The IS NOT NULL Operator<\/h2>\n<p>The <code>IS NOT NULL <\/code>operator will test for non-empty values. Still using the table above, let&#8217;s query to list all customers with a NOT NULL value in the field &#8220;ContactName&#8221;.<\/p>\n<p><span style=\"text-decoration: underline\"><em>IS NOT NULL operator example<\/em><\/span><\/p>\n<pre class=\"brush:sql\">SELECT CustomerName, ContactName, City\nFROM Customers\nWHERE ContactName IS NOT NULL;\n<\/pre>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_not_null.png\"><img decoding=\"async\" width=\"400\" height=\"200\" src=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_not_null.png\" alt=\"\" class=\"wp-image-104146\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_not_null.png 400w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/is_not_null-300x150.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><figcaption>IS NOT NULL query result<\/figcaption><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\" id=\"h-5-summary\">5. Summary<\/h2>\n<p>In summary, we saw what&#8217;s is a NULL value in a SQL table. We noticed that null values are different from zeros and blank spaces that can be inserted into the table&#8217;s field.<\/p>\n<p>Also, we could see the operators IS NULL and IS NOT NULL to test null values in a table example.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-6-download-the-source-code\">6. Download the source code<\/h2>\n<div class=\"download\"><strong>Download<\/strong><br \/>\nYou can download the full source code of this example here: <a href=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2021\/08\/sql_null_not_null.zip\"><strong>SQL is null &#8211; SQL is not null<\/strong><\/a><\/div>\n<p><strong>Last updated on Jan. 4th, 2021<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we&#8217;re going to see how to test null values in an SQL database. 1. What is a NULL Value? Basically, a field with a NULL value in a SQL table is a field without value. When creating a table, we can mark a column that accepts null values when inserting data into &hellip;<\/p>\n","protected":false},"author":239,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[1055],"class_list":["post-104122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql","tag-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL is null - SQL is not null - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"The IS NOT NULL operator will test for non-empty values. 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