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I need help for my Uni assignments
Define Database layer? The database layer defines the data formats used in the database.
Gaps in sequence values can happen when: - A rollback happens that is when a statement changes are not accepted. - When the system crashes - When a sequence i
What are the two types of errors? The two types of errors are: a) Logical error b) System error
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
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what is definition hierarchical data model
Outer Join: The use of Outer Join is that it still joins those tuples that do not have matching values in common columns are also contained in the result table. Outer join places
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
What is recursive closure? Why is it not possible to describe this operation in relational algebra? Recursive closure is applied to recursive relationship. An instance of rec
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