what are constraints? explain with example ?
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An informational constraint is an attribute of a certain type of constraint, but one that is not enforced by the database manager. NOT NULLconstraints prevent null values from being entered into a column. Uniqueconstraints ensure that the values in a set of columns are unique and not null for all rows in the table.
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An informational constraint is an attribute of a certain type of constraint, but one that is not enforced by the database manager. NOT NULLconstraints prevent null values from being entered into a column. Uniqueconstraints ensure that the values in a set of columns are unique and not null for all rows in the table.
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