Keyword search has been proven an effective information discovery method for unstructured data (e.g. textual documents), semi-structured data (e.g. XML databases), and structured data (e.g. relational databases). For semi-structured and structured data, keyword search allows users without prior knowledge of schema and query languages (e.g. SQL for relational databases and Query for XML databases) to exploit the data, But in this paper, we will study how entity based search engines different than keyword based search engines along with their disadvantages and working
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keyword; search engines; entity; google.