Techopedia Explains Hashed TableThe features of a hashed internal table include: To declare an internal table a hashed table, the declaration of the internal table should contain the keywords 'TYPE HASHED TABLE’. This would make the internal table accessible to the internal HASH algorithm. The unique key must be declared when a HASH table is to be used as it is mandatory in the HASH algorithm. The unique key is defined by the keyword 'UNIQUE KEY’. A hash table allows the table read to have costs independent of table size. Hashed tables are preferred over other types of internal tables when there are large data sets with lots of reads and a negligible number of writes. Hashed tables are also ideal for processing large amounts of data. Regardless of the number of table entries present, the response time for key access in a hashed table remains constant. Hashed tables work comparatively faster only for full table keys and cannot work for ranges .
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