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How is Hadoop different from other data processing tools?



In Hadoop, based upon your requirements, you can increase or decrease the number of mappers without bothering about the volume of data to be processed. this is the beauty of parallel processing in contrast to the other data processing tools available.
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  • What are the main components of Mapreduce Job ?
      Main driver class which provides job configuration parameters. Mapper class which must extend org.apache.hadoop.mapredu...
  • TO_CHAR
       This will be used to extract various date formats.     The available date formats as follows.     Syntax: to_char ( date , fo...