Saturday, January 15, 2011

What are set tables and multiset tables in Teradata?Explain with an appropriate example?

What are set tables and multiset tables in Teradata?Explain with an appropriate example?
Answers:
1) Set tables cannot accept duplicate at row level not Index or key level.
Example of rows for set table:
R1 c2 c3 c4 ..cn
1 2 3 4 ... 9

Accepted
1 2 3 4 ... 9
Duplicate is Rejected
2 1 2 4 ... 9
3 2 4 4 ... 9
4 3 4 4 ... 9

2) Multi set Tables can accept
duplicate at row level not Index or key level.Exmaple of rows for multi set table:
R1 c2 c3 c4 .. cn
1 2 3 4 ... 9
1 2 3 4 ... 9
Duplicate is Accepted
2 1 2 4 ...9
3 2 4 4 ...9
3 2 4 4 ...9
Duplicate is Accepted

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