To create a PRIMARY KEY constraint on existing table “EMPLOYEE” on "EMPID" column and currently column does not contain any value , which is the correct SQL syntax from the following

Options
- Alter table EMPLOYEE Add Constraint PK-EMPID Primary Key, EMPID;
- Update table EMPLOYEE Add Constraint PK-EMPID Primary Key (EMPID);
- Alter table EMPLOYEE Add Constraint PK-EMPID Primary Key (EMPID);
- Alter table EMPLOYEE Add Constraint PK-EMPID Primary Key, (EMPID);

CORRECT ANSWER : Alter table EMPLOYEE Add Constraint PK-EMPID Primary Key (EMPID);

Discussion Board
what is the difference between hear options 1,3,4

i think both as same

sandhya 02-14-2020 02:29 AM

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