Which of the following is the valid syntax for adding a PRIMARY KEY constraint to an existing table? ( refer to the tables in the JustLee Books database).                                                                                                           a. ALTER TABLE tablename ADD CONSTRAINT PRIMARY KEY (columnname); b. ALTER TABLE tablename ADD CONSTRAINT (columnname) PRIMARY KEY constraintname;                                                                                                  c. ALTER TABLE tablename ADD [CONSTRAINT constraintname] PRIMARY KEY; d. None of the above is valid syntax.

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
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Which of the following is the valid syntax for adding a PRIMARY KEY constraint to an existing table? ( refer to the tables in the JustLee Books database).                                                                                                           a. ALTER TABLE tablename ADD CONSTRAINT PRIMARY KEY (columnname); b. ALTER TABLE tablename ADD CONSTRAINT (columnname) PRIMARY KEY constraintname;                                                                                                  c. ALTER TABLE tablename ADD [CONSTRAINT constraintname] PRIMARY KEY; d. None of the above is valid syntax.

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