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"Data types"
Abstract data types-In computing, an abstract data type or abstract data structure is a mathematical model for a certain class of data structures that have similar behavior; or for certain data types of one or more programming languages that have similar semantics. An ADT is defined indirectly, only by the operations that may be performed on it and by mathematical constraints on the effects (and possibly cost) of those operations[1].

Algebraic data type-
In computer programming, an algebraic data type (sometimes also called a variant type[1]) is a datatype each of whose values is data from other datatypes wrapped in one of the constructors of the datatype. Any wrapped datum is an argument to the constructor. In contrast to other datatypes, the constructor is not executed and the only way to operate on the data is to unwrap the constructor using pattern matching.

Composite data types-In computer science, composite data types are data types which can be constructed in a program using its programming language's primitive data types and other composite types. The act of constructing a composite type is known as composition

Function types-

Machine data types-All data in computers based on digital electronics is represented as bits (alternatives 0 and 1) on the lowest level. The smallest addressable unit of data is a group of bits called a byte (usually an octet, which is 8 bits). The unit processed by machine code instructions is called a word (as of 2008, typically 32 or 64 bits). Most instructions interpret the word as a binary number, such that a 32-bit word can represent unsigned integer values from 0 to 232 − 1 or signed integer values from − 231 to 231 − 1. Because of two's complement, the machine language and machine don't need to distinguish between these unsigned and signed data types for the most part.

Object types-
In computer science, an object commonly means a compilation of attributes (object elements) and behaviors (methods) encapsulate on an entity.

Objects are the foundation of object-oriented programming, and are fundamental data types in object-oriented programming languages. These languages provide extensive syntactic and semantic support for object handling, including a hierarchical type system, special notation for declaring and calling methods, and facilities for hiding selected fields from client programmers. However, objects and object-oriented programming can be implemented in any langua

Pointer and reference data types-
In computer science, a reference is a value that enables a program to directly access a particular data item, such as a variable or a record, in the computer's memory or in some other storage device. The reference is said to refer to the data item, and accessing that data is called dereferencing the reference.

Primitive data types-In computer science, primitive data type can refer to either of the following concepts:[citation needed]

a basic type is a data type provided by a programming language as a basic building block. Most languages allow more complicated composite types to be recursively constructed starting from basic types.
a built-in type is a data type for which the programming language provides built-in support.


3.What types of 3 dbms software?
A database can be a set of flat files stored on computer tape or disk or it could consist of database tables that are managed by a Database Management System (DBMS).

There are different types of DBMS products: relational, network and hierarchical. The most widely commonly used type of DBMS today is the Relational Database Management Systems (RDBMS).

Some Data Base Management Systems can be accessed directly using programming languages such as COBOL while others provide their own programming language for interacting with the database. Many DBMS applications also provide reporting and query tools to view data in the database.