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Let us now talk about the relational operations:
SELECT
The select operation is used to select few specific record from the database based on different criteria, This is a unary operation mathematically denoted as σ
Syntax:
σ (Relation)
The Boolean expression is specified in is made of a number of clauses of the form:
or
Comparison operators in the set { ≤, ≥, ≠, =, <, <} apply to the attributes whose domains are ordered value like as integer.
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
Process-oriented decompositions Process-oriented decompositions divide complex process, task or function into simpler sub processes until they get simple enough to be deal
Describe logical data independence ? Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application p
What is the use of a slotted-page structure and what is the information are there in the header? The slotted-page structure is used for organizing records within a one block.
i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
What does Aggregation mean?
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
The ER diagram clearly showing the additional tables you have implemented. SQL table creation scripts for the tables you have set up. SQL scripts showing the sample data you
Drawbacks of Data Distribution: The primary drawbacks of distributed database systems are the added complexity needed to ensure proper coordination between the sites. This increas
What is a data dictionary? Data Dictionary is a main source of data in a data management system. Its major function is to carry the creation and management of data definition
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