Every relation in a database is of the entity type. (a) true (b) false If you ne

Question

Every relation in a database is of the entity type. (a) true (b) false If you need to use a table multiple times in a query, you have to use aliases to avoid the ambiguity. (a) true (b) false The set operations can be applied to any two tables. (a) true (b) false When we apply the UNION ALL operator on any two union-compatible tables with n rows and m rows, respectively, we always get a table with n + m rows. (a) true (b) false It is possible for a multiset table (with duplicate rows) to have a primary key if we consider the composite type primary keys. (a) true (b) false Which of the following options is the default option when an integrity violation Occurs? (a) RESTRICT (b) SET NULL (c) SET DEFAULT (d) CASCADE SET NULL

Explanation / Answer

Every relation in a database is of the entity type is true or false?
Ans : False

If you need to use a table multiple times in a query,you have to use aliases to avoid ambiguity
Ans : True

The set operations can be applied to any two tables
ANs : True

When we apply the UNION ALL operator on any two union-compatible tables with n rows and m rows.
respectively we lways get a table with n+m rows

Ans : False

It is possible for a multiset table with duplicate rows to have a primary key if we consider the composite type primary keys
Ans : False

Which of the following options is the default option when an integrity violation occur
Ans: b) SET NULL, d) CASCADE

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