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What is the use of group by clause?
Group by clause is used to be relevant aggregate functions to a set of tuples. The attributes given in the group by clause are used to shape groups. Tuples with the similar value on all attributes in the group by clause are placed in one group.
explain equi-join using illustration
This assignment is worth 45% of your final grade for this module. Marks will be awarded as follows: Prototypes (wireframe and web based prototype) You are expected
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
DDL Compiler The DDL compiler changes the data definition statements (such as CREATE TABLE .... in SQL) into a set of tables having metadata tables. These tables have infor
Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is: If R has m tuples and S has n tuples then maximum siz
1. A company wants a report containing a breakdown of payroll by department. Input, which should be stored in 3 parallel arrays, includes each employee's department number, hourly
differences between a classified catalog and a dictionary catalog
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Define the Two Phase Locking Protocol This is a protocol that is used to make sure serializability of transactions. This protocol needs that every transaction issue lock and u
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