Web Reference: When inserting such data (without email) into the table, there are two available choices: set cell to NULL or set it to empty string (''). Let's assume that I'm aware of all the technical implications of choosing one solution over another and I can create correct SQL queries for either scenario. I would like to know how to use NULL and an empty string at the same time in a WHERE clause in SQL Server. I need to find records that have either null values or an empty string. Jan 16, 2026 · This blog will demystify the difference between NULL and empty strings, then dive into practical methods to check for either in a WHERE clause. Whether you’re cleaning data, validating inputs, or generating reports, mastering these techniques is critical for accurate and reliable SQL queries.
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