Question

write the syntax for applying primary key at both label level, as well as at column level ​

Answer 1

Answer: Here is the syntax to define the ID attribute as a primary key in a CUSTOMERS table. ALTER TABLE CUSTOMER ADD PRIMARY KEY (ID); NOTE − If you use the ALTER TABLE statement to add a primary key, the primary key column(s) should have already been declared to not contain NULL values (when the table was first created).

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