This is a note I made 2 years ago for myself. Here you can see the definition of Data, Information, Database, Meta data, DBMS, Record, File, Crow's Foot notation, Table, Data, Logical Data Type, Domain, Primary key, keys, Foreign key, Super key, Candidate key, Secondary key, Relational Set Operations with example of: Union, Intersection, Difference, Product.

2. Record: A logically connected set of one or more fields, which describes a person, place or anything
else.
File: A collection of related records.
Constraints: It is a restriction placed on a data. Constraints are important because they helps to
ensure, data integrity. Constraints are normally represented in a form of rules. Ex- A student's CGPA
must be above 6.0.