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Can we add null constraint to existing table

 
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Can we add null constraint to existing table?
 
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Hibernate Oracle Java
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Yes we can add null constraint to existing table.

ALTER TABLE `hibernate`.`billingdetails` CHANGE COLUMN `BANK_NAME` `BANK_NAME` VARCHAR(255) NOT NULL ;

ALTER TABLE `hibernate`.`billingdetails` CHANGE COLUMN `BANK_ACCOUNT_NO` `BANK_ACCOUNT_NO` VARCHAR(255) NULL ;
 
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As long as the data already in the table satisfies the constraint. If it doesn't you'll have to fix the data first.
 
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