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Define an operator that a Relational Algebra does not have
Ans: Relational Algebra does not have Aggregation operators.
For Colorado customers calculate the number of single products ordered. If a product is purchased on multiple orders, it should be counted only single time. The result should conta
Security: In a centralised system, access to the data can be simply controlled. Though, in a distributed DBMS not only does access to replicated data have to be controlled in many
Ask Write the SQL code that will create the table structure for a table named EMP _1. This table is a subset of the EMPLOYEE table. The basic EMP_1 table structure is summarized in
give some example real-life situations where DBMS are most suiitabe
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
How to create a table from existing table? Create table as e.g, To create a new table ‘N_emp' with employee names and their identification numbers only from employee ta
what does glory be mean
Timestamp Ordering Protocol A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item
What is magnetic disks?explain it? Magnetic disk provides the bulk of secondary storage of modern computer system. The disk capacity is growing at over 50% per year. But the st
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