What is Index?
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Index is one of the databse object.it is used to quickly
locate the particular record.
i.e.if a table contains thousand's of record, in which
retrieving the particular record is difficult.so if we
create index in primary key column, we can retrieve
particular record very soon. so we can save the time.
ex.create index indexname for tablename of columnname.
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Answer / the who
Index is list of keywords/keys/words that represent a unique
record/tuple.
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Teradata 
