Question

Which of the following statements about system information in RDBMS is

true?

a. RDBMS stores database definition information in system-created tables

b. System information can be accessed using SQL

c. System information often cannot be updated by a user

d. All of the given options​

Answer 1

Answer:

The answer is no.

D. All the given option

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Answer 2

Answer:

A relational database is the (most commonly digital) database based on relational model of data, as proposed by E. F. Codd in the 1970. A system used to maintain relational databases is the relational database management system (RDBMS). Many relational database systems are equipped with option of using SQL (Structured Query Language) for querying and maintaining database.

The term "relational database" was first defined by the E. F. Codd at IBM in 1970. Codd introduced term in his research paper "A Relational Model of Data for Large Shared Data Banks". In the paper and later papers, he defined what he meant by "relational". One well-known definition with what constitutes a relational database system is composed of the Codd's 12 rules. However, no commercial implementations of relational model conform to all of Codd's rules, so term has gradually come to describe a broader class of database systems

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