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what is index and types in indexes?

Answer Posted / deepthi

index : Indexes are associated with tables for data retrieval.
 E.g.) read table itab index 1. This means the 1st record is read.

2 types :
Primary key index : automatically created in sap when ever a table is created with number 0.
Secondary index : a Key which is Created other than primary keyto speed up the process

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