What are the types of tables in Teradata
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Answer Posted / ravi bandi
permanent tables:
1.set---which thow out any rows that complete duplicates
2.mutiset--which allows multiple instances for same row.
temporary tables:
1.global temporary tables-- when it is created its
definition stored on data dictionary. the data will be
stored on temp space that's why data is active upto the
session ends, we can collect statistics on GTT.
2.volatile temporary tables--when it is created the
definition is stored on cache.the data will be stored in
spool space,thats why data and table defition both are
active up to session ends.you can't collect statistics on
VTT.
3.derived tables-- when we created the definition is stored
on cache.it is local to an sql query.
they are specified on a query level with an AS keyword in
an sql ststment.
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