Oracle Database SQL 12c 1z0-071 Exam Practice Test 1

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Which task can be performed by using a single Data Manipulation Language (DML) statement?

adding a column constraint while inserting a row into a table
adding a column with a default value while inserting a row into a table
removing all data only from a single column on which a unique constraint is defined
removing all data only from a single column on which a primary key constraint is defined

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