HCL DBMS Quiz – 1

Charles Bachman along with his team invented the first DBMS known as Integrated Data Store (IDS).

Different types are:

1) Centralized

2) Distributed

3) Relational

4) NoSQL

5) Cloud

6) Object-oriented

7) Hierarchical

8) Network

The authorised user can construct a database to store, edit, or retrieve the organised data in the table using a database management system (DBMS). It can only be edited or retrieved by people with DBMS access.

MySQL, Microsoft Access, IBM DB2 are database management systems while Google is a search engine. MySQL is a Linux-based database management system, Microsoft Access is a tool that is a part of Microsoft Office used to store data, IBM DB2 is a database management system developed by IBM. Google’s Bigtable is the database that runs Google’s Internet search, Google Maps, YouTube, Gmail, and other products.

An entity is a distinct "thing" or "object" from all other objects in the real world. For instance, each employee in a company is a separate entity. Entity Relation model

It consists of a collection of tables i.e., the data is organized in tabular format. The columns of the relation are known as Fields and rows of the relation are known as fields. Constraints in a relation are known as Keys.

Because all of the data is kept on the disc in the form of memory, the database management system requires a high-speed, large-capacity disc.

The Delete command is used to remove a record from a table. The drop table removes the relation's whole structure. Purge removes the table which cannot be obtained again.

 Domain relational calculus and Tuple relational calculus are non-procedural languages. Relational algebra is a procedural language that accepts a relation as input and produces a relation as output.

If and only if a table is in 4NF for each of its non-trivial multivalued dependents X twoheadrightarrow Y. X is a superkey, which means it is either a candidate key or its superset.