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Explain the role of metadata for the three-layer architecture.
What are the differences between hash join, merge join and nested loops?
Explain bcnf (boyce-codd normal form)?
Why is database used?
What do you mean by cardinality and its types?
What is table normalization?
What is a form used for in a database?
Why indexing is used in database?
What do you mean by entity type extension?
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What is dba stand for?
How is the pattern matching done in the sql?
What is the default '-sort' order for a sql?
What do you understand by query optimization?
