​Which of the Following Statements About Creating Constraints Is Incorrect?​

question 123

Multiple Choice

​Which of the following statements about creating constraints is incorrect?​

• A) ​If a constraint applies to more than one column,the constraint must be created at the table level.
• B) ​Using the column level approach,the definition of the constraint is included as part of the column definition.
• C) ​When you create constraints at the column level,the constraint being created applies to the column specified.
• D) ​The NOT NULL constraint can be created at either the column level or the table level.

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Definitions:

Phosphorous

A reactive chemical element with the symbol P, essential for life but also a pollutant at high concentrations.

Methane

A potent greenhouse gas, CH4, that contributes to global warming, released through natural processes and human activities like agriculture.

Water Vapour

The gaseous phase of water, present in the atmosphere, influencing weather and climate by absorbing thermal infrared radiation.

Carbon Dioxide

An odorless, colorless gas that is generated both by the burning of carbon and organic compounds and through breathing. It naturally exists in the air and plays a crucial role in photosynthesis, being absorbed by plants.