How to do IS NULL and IS NOT NULL with Yii 2 ActiveRecord?

Question

I have a table which has a field `activated_at` timestamp NULL DEFAULT NULL, which means that it can contain a timestamp or it can be null and it\'s

Answer 1

this solution check if column_name is empty or NULL

WHERE (LENGTH(`column_name`) > 0)

->andWhere(['>', 'LENGTH(column_name)', 0]) //check if empty or null

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Another variant - check only for NULL

WHERE column_name IS NOT NULL

->andWhere(['IS NOT', 'column_name', null]); // check on null