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What are the reasons for having variable length records? What are the various ways to store variable length records?
Variable-length records arise in a database in various ways:
(i)Storage of multiple items in a file. (ii)Record types allowing variable field size (iii)Record types allowing repeating fieldsVarious ways of storing variable length records:
(i) In fixed form through allocating every record, maximum amount of space in which can be occupied a record and padding smaller sized records along with nulls. (ii) Special separator characters among the records to delineate variable length records.
Run the following queries. For each query show 1) What you expect the output to be based upon the data 2) the SQL code and 3) the output running the query in Oracle. 1. Show all c
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A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
The insertion of a tuple in the aim of reference does not cause any destruction. Though, insertion of a tuple in the relation in which, we has the foreign key, for instance, in ASS
Submit SQL INSERT Statements that will populate the database with sample data. You must insert at least 5 records into each table in your database.Submit your SQL INSERT Statement
What is the disadvantage of a call by reference? During a call by reference damage or loss of data is not restricted to the subroutine, but will instantly lead to alters to th
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Explain the challenges before an E-business management.
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
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
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