{"id":199267,"date":"2023-12-30T06:04:00","date_gmt":"2023-12-30T06:04:00","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/"},"modified":"2023-12-30T06:04:00","modified_gmt":"2023-12-30T06:04:00","slug":"how-to-add-null-value-in-sql-select-query","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/","title":{"rendered":"How to add null value in SQL select query?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#How_to_add_null_value_in_SQL_select_query\" title=\"How to add null value in SQL select query?\">How to add null value in SQL select query?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#FAQs\" title=\"FAQs:\">FAQs:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#1_How_do_you_insert_a_null_value_in_a_SQL_table\" title=\"1. How do you insert a null value in a SQL table?\">1. How do you insert a null value in a SQL table?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#2_Can_you_update_a_column_to_be_null_in_SQL\" title=\"2. Can you update a column to be null in SQL?\">2. Can you update a column to be null in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#3_What_happens_when_you_try_to_insert_a_null_value_into_a_NOT_NULL_column\" title=\"3. What happens when you try to insert a null value into a NOT NULL column?\">3. What happens when you try to insert a null value into a NOT NULL column?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#4_How_do_you_check_if_a_column_contains_null_values_in_SQL\" title=\"4. How do you check if a column contains null values in SQL?\">4. How do you check if a column contains null values in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#5_Can_you_compare_null_values_in_SQL\" title=\"5. Can you compare null values in SQL?\">5. Can you compare null values in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#6_What_is_the_difference_between_NULL_and_an_empty_string_in_SQL\" title=\"6. What is the difference between NULL and an empty string in SQL?\">6. What is the difference between NULL and an empty string in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#7_How_do_you_handle_null_values_in_SQL_queries\" title=\"7. How do you handle null values in SQL queries?\">7. How do you handle null values in SQL queries?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#8_Can_you_use_NULL_as_a_default_value_for_a_column_in_SQL\" title=\"8. Can you use NULL as a default value for a column in SQL?\">8. Can you use NULL as a default value for a column in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#9_What_is_the_behavior_of_aggregate_functions_with_null_values_in_SQL\" title=\"9. What is the behavior of aggregate functions with null values in SQL?\">9. What is the behavior of aggregate functions with null values in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#10_How_do_you_handle_null_values_in_joins_in_SQL\" title=\"10. How do you handle null values in joins in SQL?\">10. How do you handle null values in joins in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#11_Can_you_group_by_null_values_in_SQL\" title=\"11. Can you group by null values in SQL?\">11. Can you group by null values in SQL?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#12_How_do_you_filter_out_null_values_from_a_result_set_in_SQL\" title=\"12. How do you filter out null values from a result set in SQL?\">12. How do you filter out null values from a result set in SQL?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_add_null_value_in_SQL_select_query\"><\/span>How to add null value in SQL select query?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In SQL, you can add a null value in a select query by using the keyword NULL. When you want to return a null value in the result set, you can use the NULL keyword in the select statement to explicitly specify that a column should contain a null value.<\/p>\n<p>For example, if you have a table named &#8220;customers&#8221; with columns &#8220;customer_id&#8221; and &#8220;customer_name&#8221;, and you want to select all customers with a null value for the &#8220;customer_name&#8221; column, you can use the following SQL query:<\/p>\n<p>&#8220;`<br \/>\nSELECT customer_id, NULL as customer_name<br \/>\nFROM customers<br \/>\nWHERE customer_name IS NULL;<br \/>\n&#8220;`<\/p>\n<p>This query will return all records from the &#8220;customers&#8221; table where the &#8220;customer_name&#8221; column is null.<\/p>\n<p>**Adding null value in a SQL select query is simple &#8211; use the keyword NULL.**<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_How_do_you_insert_a_null_value_in_a_SQL_table\"><\/span>1. How do you insert a null value in a SQL table?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo insert a null value in a SQL table, you can use the NULL keyword in the insert query for columns where you want to set the value to null.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_you_update_a_column_to_be_null_in_SQL\"><\/span>2. Can you update a column to be null in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can update a column to be null in SQL by using the UPDATE statement with the SET clause, setting the column value to NULL.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_What_happens_when_you_try_to_insert_a_null_value_into_a_NOT_NULL_column\"><\/span>3. What happens when you try to insert a null value into a NOT NULL column?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf you try to insert a null value into a NOT NULL column, you will receive an error in SQL. You must ensure that the value being inserted conforms to the column&#8217;s constraints.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_do_you_check_if_a_column_contains_null_values_in_SQL\"><\/span>4. How do you check if a column contains null values in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can check if a column contains null values in SQL by using the IS NULL or IS NOT NULL operators in the WHERE clause of a select query.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Can_you_compare_null_values_in_SQL\"><\/span>5. Can you compare null values in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNull values cannot be compared using standard comparison operators like equals (=) or not equals (!=) in SQL. You must use the IS NULL or IS NOT NULL operators to compare null values.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_What_is_the_difference_between_NULL_and_an_empty_string_in_SQL\"><\/span>6. What is the difference between NULL and an empty string in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNULL represents a lack of value or unknown value, while an empty string (&#8221;) is a valid value that represents a string with no characters. NULL is treated differently in SQL compared to an empty string.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_How_do_you_handle_null_values_in_SQL_queries\"><\/span>7. How do you handle null values in SQL queries?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo handle null values in SQL queries, you can use functions like ISNULL() or COALESCE() to replace null values with another value or handle them appropriately in the result set.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_you_use_NULL_as_a_default_value_for_a_column_in_SQL\"><\/span>8. Can you use NULL as a default value for a column in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use NULL as a default value for a column in SQL by not specifying a default value in the column definition. This will allow the column to accept null values by default.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_What_is_the_behavior_of_aggregate_functions_with_null_values_in_SQL\"><\/span>9. What is the behavior of aggregate functions with null values in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nAggregate functions like SUM(), AVG(), COUNT(), etc., ignore null values in SQL. These functions calculate the result based on non-null values only.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_How_do_you_handle_null_values_in_joins_in_SQL\"><\/span>10. How do you handle null values in joins in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhen joining tables in SQL, you can use the COALESCE() function to handle null values by replacing them with a default value. This ensures that the join operation includes null values appropriately.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Can_you_group_by_null_values_in_SQL\"><\/span>11. Can you group by null values in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can group by null values in SQL. When grouping by a column that contains null values, the null values will be grouped together in the result set.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_How_do_you_filter_out_null_values_from_a_result_set_in_SQL\"><\/span>12. How do you filter out null values from a result set in SQL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo filter out null values from a result set in SQL, you can use the WHERE clause with the IS NOT NULL operator to exclude rows where a specific column contains a null value.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to add null value in SQL select query? In SQL, you can add a null value in a select query by using the keyword NULL. When you want to return a null value in the result set, you can use the NULL keyword in the select statement to explicitly specify that a column should &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to add null value in SQL select query?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-null-value-in-sql-select-query\/#more-199267\">Read more<span class=\"screen-reader-text\">How to add null value in SQL select query?<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-199267","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to add null value in SQL select query?<\/title>\n<meta name=\"description\" content=\"How to add null value in SQL select query? 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