Java Programming Multiple Choice What are the columns of a table that have a uni

Question

Java Programming Multiple Choice

What are the columns of a table that have a unique value that cannot be duplicated in other rows called?

Primary key.

Query.

SQL statement.

Lookup value.

All of the above.

Primary key.

Query.

SQL statement.

Lookup value.

All of the above.

Explanation / Answer

Answer: a.Primary Key. Explanation: ->A primary key is a field in a table which uniquely identifies each row/record in a database table. ->Primary keys must contain unique values. A primary key column cannot have NULL values. ->A table can have only one primary key, which may consist of single or multiple fields. ->Finally If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).

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