Question 1 :
The relational database model was created by E.F. Codd.
The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by E.F. Codd.
Question 2 :
A database is called "self-describing" because it contains a description of itself.
Question 3 :
In a database, data is stored in spreadsheets which have rows and columns.
Question 4 :
A database has data and relationships.
Question 5 :
One of the reasons why OODBMSs have not been widely used for business information systems is that OOP is obsolete.