Examlex
An entity instance of an entity class is the representation of a particular entity and is described by the values of the attributes of the entity.
Nitrate
A polyatomic ion with a chemical formula of NO3-; commonly found in fertilizers and explosive materials.
Physical Properties
Physical properties are attributes of a substance that can be observed or measured without changing its chemical composition, such as density, boiling point, and melting point.
Ionic Compounds
Chemical compounds composed of ions held together by electrostatic forces termed ionic bonding; typically formed between metal and non-metal elements.
Ionic Compound
A chemical compound composed of ions held together by electrostatic forces termed ionic bonding, typically formed between metal and non-metal ions.
Q5: In IDEF1X,extended E-R model subtype entities are
Q13: A surrogate key is an artificial column
Q18: A simple object is a semantic object
Q20: The MySQL Installer for Windows should be
Q20: The SQL command used to create a
Q22: Because of the need to know the
Q41: A row can be uniquely identified by
Q45: MySQL is an open source DBMS that
Q53: To add a NOT NULL column to
Q87: Depending on the DBMS,when changing the minimum