SAP HASH KEY GLOSRY documentation, setup help and example usage

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Hash Key
Unique table key of an internal table , in which the assignment to the table rows is managed using a hash algorithm . A hash key is the primary table key of a hashed table and can be assigned to every type of internal table as a secondary table key . During access to an internal table using a hash key, the response time is constant, regardless of the number of table entries.