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Not null constraint
What would you use to place a not null constraint on a column? If the column is left blank on insertion, it should display a custom error message.
1. Rule
2. CHECK Contstraint
3. Triggers
4. Alter the table so that the column does not allow null
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Re: Not null constraint
Alter the table so that the column does not allow null
and write a trigger to display custom eror message.
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Expert Member
Re: Not null constraint
Alter the table so that the column does not allow null..
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