The SQL Keyword CONSTRAINT Is Used to Define One of Several

question 23

True/False

The SQL keyword CONSTRAINT is used to define one of several types of constraints.

---

Definitions:

π Network

A collection of π bonds (p-orbital overlap contributing to bonding in molecules) interconnected in a molecule, fundamental to the structure and stability of aromatic compounds.

Acidic H Atoms

Hydrogen atoms in a molecule that can be donated as protons during an acid-base reaction.

AntiAromatic

Describes molecules that do not follow Hückel's rule, often destabilized and non-planar, lacking aromatic stabilization.

NonAromatic

A classification for organic compounds that do not meet the criteria for aromaticity, lacking a conjugated system of pi electrons.