Mysql is not null or empty EDIT: MySQL still seems to swallow the NULL value this way. I need to write a query that works with the JSON column type. SELECT Table1. SELECT IF(yourColumnName IS NULL or yourColumnName = '', 'NULLId', yourColumnName) as anyVariableName from yourTableName; Feb 15, 2024 · MySQL で列が Null または空かどうかを確認する テーブル内に存在する null または空の列値を除外する手順については、前のセクションで説明します。 NULL または空のチェックの構文は次のとおりです。 Jun 6, 2024 · When applied to a column containing an empty value, it returns NULL, allowing us to check for NULL using the IS NULL operator. I'm trying to create a trigger and then check if data is NULL or empty. id AND Table1. The NOT NULL constraint enforces a column to NOT accept NULL values. The IS NOT NULL operator is used to test for non-empty values (NOT NULL values). is not null: 指定した列が null でない場合に真を返します。 This phpMyAdmin query is returning those rows, that are NOT null or empty or just whitespaces: SELECT * FROM `table_name` WHERE NOT ((`column_name` IS NULL) OR (TRIM(`column_name`) LIKE '')) if you want to select rows that are null/empty/just whitespaces just remove NOT. It is not possible to test for NULL values with comparison operators, such as =, <, or <>. hpaakllkezrwghxeljrwfjgbrvoxlwkjsoqysytnbcdnbwyoiaanrmjtcvyicmsygjmtpwefsvkeh