Web Reference: Learn how to use the DEFAULT constraint to set a default value for a column in SQL. See examples of creating, altering and dropping a DEFAULT constraint in different SQL databases. Nov 18, 2025 · A default constraint doesn't change when the row is updated. To update a value whenever the row is modified, consider using a trigger, a temporal table, a computed column, or a rowversion binary string. Feb 10, 2026 · The DEFAULT constraint in SQL automatically assigns a predefined value to a column when no value is provided during insertion. It helps maintain consistency and reduces the need to specify values for every column in an INSERT query.
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