COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Aditi wants to apply a constraint on a table “student”, where in she wants to restrict the marks entered as values between only 1 and 100. Which of the following constraints should she use?
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Default
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Check
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Primary Key
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Unique
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Explanation:
Detailed explanation-1: -The CHECK constraint is used to limit the value range that can be placed in a column.
Detailed explanation-2: -CHECK constraints enforce domain integrity by limiting the values that are accepted by one or more columns.
Detailed explanation-3: -NOT NULL Constraint in SQL This means that you should provide a valid SQL NOT NULL value to that column in the INSERT or UPDATE statements, as the column will always contain data.
Detailed explanation-4: -15. Which SQL constraint do we use to set some value to a field whose value has not been added explicitly? Explanation: The DEFAULT constraint is used to set a default value for a column which comes into use when a value for a field in that column is not set.
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