Which two statements are true about the primary key constraint in a table? ()A、It is not possible to disable the primary key constraint.B、It is possible to have more than one primary key constraint in a single table.C、The primary key constraint can be ref
题目
Which two statements are true about the primary key constraint in a table? ()
A、It is not possible to disable the primary key constraint.
B、It is possible to have more than one primary key constraint in a single table.
C、The primary key constraint can be referred by only one foreign key constraint.
D、The primary key constraint can be imposed by combining more than one column.
E、The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.
更多“Which two statements are true about the primary key constraint in a table? ()A、It is not possible to disable the primary key constraint.B、It is possible to have more than one primary key constraint in a single table.C、The primary key constraint can be ref”相关问题