单选题
发布日期:2021-03-17
A trigger should be created for the CustInfo table so as to roll back INSERT queries that duplicate data is included.
A new unique index should be created on the CustName column. And then, IGNORE_DUP_KEY = ON should be specified when creating index.
On the CustName column, a foreign key constraint should be created, and a distinct list of CustName values is referenced by the foreign key constraint.
A SELECT INTO query should be utilized, and GROUP BY and HAVING clauses should be included by the query to create a new table that contains duplicate rows from the CustInfo table.
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