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.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Procedures in SQL

A pre-compiled stored procedure is a logical unit made up of one/more SQL statements (SQL stands for Structured Query Language). The database server saves it as an object. An SQL procedure is a collection of SQL statements and logic that is written and saved to accomplish a specified goal. An SQL procedure consists of a name, a parameter list, and a set of Transact-SQL statements. Stored procedures are stored as named objects in SQL Database Server.

Question

The command DESC DEPARTMENTS shows the following information:
Name
A M G V
Null?
MANAGER D
LOCATION ID
DEPARTMENT ID NOT NULL NUMBER (4)
DEPARTMENT NAME NOT NULL VARCHAR2 (30)
NUMBER (6)
NUMBER (4)
Туре
A developer then runs the following command
ALTER TABLE ADD CONSTRAINT
KEY (DEPARTMENT ID);
What is the outcome ?
DEPARTMENT PK
A primary key for DEPARTMENTS is created.
A foreign key for DEPARTMENTS is created.
PRIMARY
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.

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