The command DESC DEPARTMENTS shows the following information:NameA M G VNull?MANAGER DLOCATION IDDEPARTMENT ID NOT NULL NUMBER (4)DEPARTMENT NAME NOT NULL VARCHAR2 (30)NUMBER (6)NUMBER (4)ТуреA developer then runs the following commandALTER TABLE ADD CONSTRAINTKEY (DEPARTMENT ID);What is the outcome ?DEPARTMENT PKA primary key for DEPARTMENTS is created.A foreign key for DEPARTMENTS is created.PRIMARYAn error occurs because column DEPARTMENT_ID already has theconstraint NOT NULLThe command DESC does not show information of the primary key of atable, therefore we won't know if the command will or will not fail.

The following information is DESC DEPARTMENTS. And after running the following command ALTER…

A developer then runs the following command ALTER TABLE ADD KEY (DEPARTMENT__ID); What is the outcome? CONSTRAINT DEPARTMENT PK A primary key for DEPARTMENTS is created. PRIMARY A foreign key for DEPARTMENTS is created. An error occurs because column DEPARTMENT_ID already has the constraint NOT NULL The command DESC does not show information of the primary key of a table, therefore we won't know if the command will or will not fail.

A developer then runs the following command ALTER TABLE ADD KEY (DEPARTMENT__ID); What is the outcome? CONSTRAINT DEPARTMENT PK A primary key for DEPARTMENTS is created. PRIMARY A foreign key for DEPARTMENTS is created. An error occurs because column DEPARTMENT_ID already has the constraint NOT NULL The command DESC does not show information of the primary key of a table, therefore we won't know if the command will or will not fail.

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter6: Additional Database Objects

Section: Chapter Questions

Problem 12MC

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