Abstract
Relational databases are known as collections of structured data within the digital structure and are normally arranged in rows and columns. However, most business data are present in the form of unstructured. Data extraction is a process of extracting unstructured, semi-structured, and structured data from the user requirement upon the web pages on the internet, in any type of automation level. Web pages contain data region which is formally in a structured data format. Manipulating and analyzing data using tools always required massive computing server resources. This paper will review existing techniques on data extraction for heterogeneous data in the Big Data environment. This review is aimed to discuss different data extraction approaches together with the basic tools algorithm for extracting favored data from various web sources. The various types of approaches that will be examined are Information Extraction Approaches, Automatic Wrapper Generation, SemiAutomatic Wrapper Generation, Wrapper Induction, and Wrapper Maintenance. Although, many required techniques from web sources have been tested and developed, but the reviews on these techniques are still lacking. This paper reviews data extraction using wrapper approaches and compares each to identify the best approach to extract data from online sites.
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