Helium Was First Discovered in the

question 12

Multiple Choice

Helium was first discovered in the

• A)laboratory.
• B)upper atmosphere.
• C)sun.
• D)island of Helios,in Greece.
• E)by-products of nuclear fusion.

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Definitions:

Save As Back Up

Save As Back Up is a process of saving a copy of a file or database under a different name or location to ensure data safety in case of loss or corruption.

Primary Key

A primary key is a unique identifier for each record in a database table, used to ensure that each entry is distinct and retrievable.

Principal Key

Another term for primary key, an attribute or set of attributes that uniquely identifies each record in a database table.

Foreign Key

An attribute in a database table that provides a link between data in two tables, typically to enforce referential integrity.