{"id":202183,"date":"2024-09-30T06:25:19","date_gmt":"2024-09-30T06:25:19","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-oracle-select-query\/"},"modified":"2024-09-30T06:25:19","modified_gmt":"2024-09-30T06:25:19","slug":"how-to-check-null-value-in-oracle-select-query","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-oracle-select-query\/","title":{"rendered":"How to check null value in Oracle SELECT query?"},"content":{"rendered":"<p><b>To check for null values in an Oracle SELECT query, you can use the IS NULL operator. This operator is used to test for a null value in a column. Here&#8217;s an example: <\/b><\/p>\n<p>&#8220;`sql<br \/>\nSELECT * <br \/>\nFROM table_name<br \/>\nWHERE column_name IS NULL;<br \/>\n&#8220;`<\/p>\n<p>This query will return all rows where the column_name is null.<\/p>\n<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-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-oracle-select-query\/#1_Can_I_check_for_null_values_in_multiple_columns_in_the_same_query\" title=\"1. Can I check for null values in multiple columns in the same query?\">1. Can I check for null values in multiple columns in the same query?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-oracle-select-query\/#2_What_if_I_want_to_check_for_non-null_values\" title=\"2. What if I want to check for non-null values?\">2. What if I want to check for non-null values?<\/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-check-null-value-in-oracle-select-query\/#3_Can_I_use_the_IS_NULL_operator_with_other_conditions\" title=\"3. Can I use the IS NULL operator with other conditions?\">3. Can I use the IS NULL operator with other conditions?<\/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-check-null-value-in-oracle-select-query\/#4_How_can_I_check_for_null_values_in_a_specific_row\" title=\"4. How can I check for null values in a specific row?\">4. How can I check for null values in a specific row?<\/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-check-null-value-in-oracle-select-query\/#5_Is_there_a_way_to_check_for_null_values_in_a_column_that_may_contain_both_null_and_non-null_values\" title=\"5. Is there a way to check for null values in a column that may contain both null and non-null values?\">5. Is there a way to check for null values in a column that may contain both null and non-null values?<\/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-check-null-value-in-oracle-select-query\/#6_Can_I_use_the_IS_NULL_operator_with_aggregate_functions\" title=\"6. Can I use the IS NULL operator with aggregate functions?\">6. Can I use the IS NULL operator with aggregate functions?<\/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-check-null-value-in-oracle-select-query\/#7_How_can_I_check_for_null_values_in_a_subquery\" title=\"7. How can I check for null values in a subquery?\">7. How can I check for null values in a subquery?<\/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-check-null-value-in-oracle-select-query\/#8_What_if_I_want_to_check_for_null_values_in_a_specific_range_of_rows\" title=\"8. What if I want to check for null values in a specific range of rows?\">8. What if I want to check for null values in a specific range of rows?<\/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-check-null-value-in-oracle-select-query\/#9_Can_I_check_for_null_values_in_a_join_condition\" title=\"9. Can I check for null values in a join condition?\">9. Can I check for null values in a join condition?<\/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-check-null-value-in-oracle-select-query\/#10_How_can_I_check_for_null_values_in_a_column_with_a_specific_data_type\" title=\"10. How can I check for null values in a column with a specific data type?\">10. How can I check for null values in a column with a specific data type?<\/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-check-null-value-in-oracle-select-query\/#11_Is_it_possible_to_check_for_null_values_in_a_column_that_is_part_of_a_composite_key\" title=\"11. Is it possible to check for null values in a column that is part of a composite key?\">11. Is it possible to check for null values in a column that is part of a composite key?<\/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-check-null-value-in-oracle-select-query\/#12_Can_I_check_for_null_values_in_a_column_that_is_calculated_using_a_function\" title=\"12. Can I check for null values in a column that is calculated using a function?\">12. Can I check for null values in a column that is calculated using a function?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"1_Can_I_check_for_null_values_in_multiple_columns_in_the_same_query\"><\/span>1. Can I check for null values in multiple columns in the same query?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can check for null values in multiple columns by using the IS NULL operator for each column you want to check.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_What_if_I_want_to_check_for_non-null_values\"><\/span>2. What if I want to check for non-null values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo check for non-null values, you can use the IS NOT NULL operator in your SELECT query.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Can_I_use_the_IS_NULL_operator_with_other_conditions\"><\/span>3. Can I use the IS NULL operator with other conditions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can combine the IS NULL operator with other conditions using the AND or OR logical operators in your SELECT query.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_can_I_check_for_null_values_in_a_specific_row\"><\/span>4. How can I check for null values in a specific row?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can specify the row you want to check for null values by adding a WHERE clause with the row&#8217;s identifier and the IS NULL operator.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Is_there_a_way_to_check_for_null_values_in_a_column_that_may_contain_both_null_and_non-null_values\"><\/span>5. Is there a way to check for null values in a column that may contain both null and non-null values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use the NVL function in Oracle to replace null values with a specific value before checking for them in a SELECT query.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Can_I_use_the_IS_NULL_operator_with_aggregate_functions\"><\/span>6. Can I use the IS NULL operator with aggregate functions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use the IS NULL operator with aggregate functions like COUNT, SUM, AVG, etc., to check for null values in the result of the aggregate function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_How_can_I_check_for_null_values_in_a_subquery\"><\/span>7. How can I check for null values in a subquery?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can use the IS NULL operator in a subquery just like you would in a regular SELECT query by specifying the column or expression you want to check for null values.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_What_if_I_want_to_check_for_null_values_in_a_specific_range_of_rows\"><\/span>8. What if I want to check for null values in a specific range of rows?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can use the ROW_NUMBER() function in Oracle to assign a row number to each row in your result set and then filter the rows based on the assigned row number.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Can_I_check_for_null_values_in_a_join_condition\"><\/span>9. Can I check for null values in a join condition?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can use the IS NULL operator in a join condition to filter rows where the join condition column is null in either of the tables being joined.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_How_can_I_check_for_null_values_in_a_column_with_a_specific_data_type\"><\/span>10. How can I check for null values in a column with a specific data type?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYou can use the IS NULL operator with columns of any data type in an Oracle SELECT query to check for null values.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Is_it_possible_to_check_for_null_values_in_a_column_that_is_part_of_a_composite_key\"><\/span>11. Is it possible to check for null values in a column that is part of a composite key?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can check for null values in a column that is part of a composite key by specifying the column in the WHERE clause with the IS NULL operator.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Can_I_check_for_null_values_in_a_column_that_is_calculated_using_a_function\"><\/span>12. Can I check for null values in a column that is calculated using a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can check for null values in a column that is calculated using a function by specifying the expression in the WHERE clause with the IS NULL operator.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To check for null values in an Oracle SELECT query, you can use the IS NULL operator. This operator is used to test for a null value in a column. Here&#8217;s an example: &#8220;`sql SELECT * FROM table_name WHERE column_name IS NULL; &#8220;` This query will return all rows where the column_name is null. 1. &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to check null value in Oracle SELECT query?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-oracle-select-query\/#more-202183\">Read more<span class=\"screen-reader-text\">How to check null value in Oracle 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-202183","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 check null value in Oracle SELECT query?<\/title>\n<meta name=\"description\" content=\"To check for null values in an Oracle SELECT query, you can use the IS NULL operator. 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This operator is used to test for a null value in a column. 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