COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many Primary key a table can max have?
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Depends on no of Columns
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Only 2
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Only 1
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Depends on DBA
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Explanation:
Detailed explanation-1: -A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).
Detailed explanation-2: -A table can only have one primary key, but it can have multiple unique constraints.
Detailed explanation-3: -A primary key uniquely identifies each record in a table. Every table has a primary key, and there can only be one primary key per table.
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