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What is Relational Algebra?
Relational Algebra is a widely used Conceptual Procedural Query Language. It collects instances of relations as inputs and provides the occurrences (yield instances) of those relations as outputs. Basically, the output of these operations is a new Relation that may be formed from one or more input relations. It uses various operations to perform this process. Relational Algebra operations are performed recursively on a relation.
What is Query Analyzer?
Query Analyzer is an interesting tool that takes the queries and examines and analyses the data inside the SQL server. We can execute queries and stored procedures using the Query Analyser and are able to get a visual display of the SQL server executed result.
Query Analyzer can be found in the SQL Server folder. For using the Query Analyzer you must have connected to the SQL Server dialog by executing the "USE" keyword (use [databasename]).
Benefits of Relational Algebra
Easiness of composting operations to form a complex query.
Easiness of building the query logic easily.
Relational Algebra Operators
Relational Algebra Operators can be categorized into three major parts. They are:
Set Operators
Relational Operators
Set Functions
Each of above mentioned relational operators can be categorized into two major types according to their operation. They are:
UnaryRelational Operators [*]
Binary Relational Operators [#]
✱important:- I have mentioned Unary Relational Operators as [*] and Binary Relational Operators as [#] in the below. Please note that they are not standard symbols to represent those types. I have used that for the easiness of identification.
1. Set Operators
Set Operators are Relational Algebra operators from Set Theory. There are four major Set operators in Relational Algebra. They are:
Union [#]
Intersection [#]
Minus/Difference [#]
Product [#]
1. Union
Union returns all values found in either set with duplicates removed (Default it eliminates duplicates).
But "UNION ALL" operator doesn't eliminate duplicates (Allows duplicates).
Eg: - Generally Union is used to combine a result of two output results takes from two different subqueries such as "Students who are either Computing or Mathematics Students".
2. Intersection
Intersection represents the overlap between two result sets. It returns only those values that are present in both sets with any duplicates removed.
Eg: - Displaying any individual on a university campus who are both Tutors and Students.
3. Minus/Difference
This operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement.
During the operation, each SELECT statement will define a dataset. The MINUS operator retrieves all records from the first dataset and then removes the resulted records from the output of the second dataset.
✱Note: - MINUS operator is not supported in every SQL DBMS. It supports several DBMS such as ORACLE. For DBMS such as SQLSever (MsSql), PostgreSQL, and SQLLite uses the "EXCEPT" operator to perform this operation. Further "EXCEPT ALL" will remove the duplicates too.
4. Product/Cartesian Product
This operation is helpful to merge columns from two relations.
Generally, this is never a meaningful operation when it performs alone. However, it becomes meaningful when it is followed by other operations.
Eg: - Shows all rows from Relation A and B whose column has value 1.
2. Relational Operators
Relational Operators are Relational Algebra operators based on joins and join-like operators. There are five major Relational Operators in Relational Algebra.
They are:
Selection/Restrict [*]
Project [*]
Join [#]
Rename [*]
Division [#]
1. Selection/Restrict
Selection is a Horizontal slice through a relation that extracts all columns but only for those rows that satisfy particular criteria (condition).
Eg: - For example let's take a scenario of filtering all Computer Science Students out of all the Students by categorizing students by their course.
2. Project
Projection is a Vertical Slice through a relation that extracts all rows but only for specific named attributes (columns).
Eg: - For example let's take the same Student Table which includes a large no of attributes (columns), but we only required a specific no of attributes to be displayed such as displaying onlyReg-Number, Name from the table which contains columns Reg-Number, Name, Email,and Contact Number.
3. Join
Join is a process that combines data from two or more relations.
Joins can be mainly categorized into three major units.
Natural Join
Inner Join
Outer Join
4. Rename
The results of relational algebra are also relations without any name.
The Rename operation allows us to rename the output relation.
3. Set Functions
Set Functions operates on a set of values and computes one single output value. They are used to formulate "group conditions" (conditions on the set of tuples). Aggregate or Set functions are introduced to relational algebra to increase its excessive power.
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How to earn from real estate marketing: The question here is can anyone work in the field of real estate marketing? The answer will definitely be no !! Because the real estate marketer must have some qualities or features in order to start working in this field, one of the most important of these qualities is dealing with society, meaning that you are not a shy person because you will not be able at this time to deal with people or specifically the seller and buyer, and there are other qualities. There are many that you should search for before starting work, as for how to find a property and promote it on social media, there are many ways you can learn and use it, as there are free real estate ads on many sites and you can access these sites and you can advertise your property for free like Craiglist, MarketPlace in Facebook and many more. The field of real estate marketing or profit by marketing real estate is a very profitable field and you can start it now.
Real estate marketing: - Real estate marketing will not differ much from online marketing, so if you have previously worked in the field of online marketing, you will be able to start working in the field of real estate marketing easily. Real estate marketing can be divided into three stages only; the first stage is to find The real estate, for example, that you found an apartment, a mansion or a villa for sale at a certain price and with certain specifications, here comes the second stage, which is the stage of real estate marketing, so now the currency of promoting the property that you have found begins, and during this stage, you may face difficulty in the beginning, but with time and work you will master it, and finally the third stage which is fun to finish The deal between the seller and the buyer and you are the middle men, and of course, here the deal should end on profit for all, not only you.
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How to earn from real estate marketing: The question here is can anyone work in the field of real estate marketing? The answer will definitely be no !! Because the real estate marketer must have some qualities or features in order to start working in this field, one of the most important of these qualities is dealing with society, meaning that you are not a shy person because you will not be able at this time to deal with people or specifically the seller and buyer, and there are other qualities. There are many that you should search for before starting work, as for how to find a property and promote it on social media, there are many ways you can learn and use it, as there are free real estate ads on many sites and you can access these sites and you can advertise your property for free like Craiglist, MarketPlace in Facebook and many more. The field of real estate marketing or profit by marketing real estate is a very profitable field and you can start it now.
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How to earn from real estate marketing: The question here is can anyone work in the field of real estate marketing? The answer will definitely be no !! Because the real estate marketer must have some qualities or features in order to start working in this field, one of the most important of these qualities is dealing with society, meaning that you are not a shy person because you will not be able at this time to deal with people or specifically the seller and buyer, and there are other qualities. There are many that you should search for before starting work, as for how to find a property and promote it on social media, there are many ways you can learn and use it, as there are free real estate ads on many sites and you can access these sites and you can advertise your property for free like Craiglist, MarketPlace in Facebook and many more. The field of real estate marketing or profit by marketing real estate is a very profitable field and you can start it now.
Real estate marketing: - Real estate marketing will not differ much from online marketing, so if you have previously worked in the field of online marketing, you will be able to start working in the field of real estate marketing easily. Real estate marketing can be divided into three stages only; the first stage is to find The real estate, for example, that you found an apartment, a mansion or a villa for sale at a certain price and with certain specifications, here comes the second stage, which is the stage of real estate marketing, so now the currency of promoting the property that you have found begins, and during this stage, you may face difficulty in the beginning, but with time and work you will master it, and finally the third stage which is fun to finish The deal between the seller and the buyer and you are the middle men, and of course, here the deal should end on profit for all, not only you.
How to earn from real estate marketing: The question here is can anyone work in the field of real estate marketing? The answer will definitely be no !! Because the real estate marketer must have some qualities or features in order to start working in this field, one of the most important of these qualities is dealing with society, meaning that you are not a shy person because you will not be able at this time to deal with people or specifically the seller and buyer, and there are other qualities. There are many that you should search for before starting work, as for how to find a property and promote it on social media, there are many ways you can learn and use it, as there are free real estate ads on many sites and you can access these sites and you can advertise your property for free like Craiglist, MarketPlace in Facebook and many more. The field of real estate marketing or profit by marketing real estate is a very profitable field and you can start it now.
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How to earn from real estate marketing: The question here is can anyone work in the field of real estate marketing? The answer will definitely be no !! Because the real estate marketer must have some qualities or features in order to start working in this field, one of the most important of these qualities is dealing with society, meaning that you are not a shy person because you will not be able at this time to deal with people or specifically the seller and buyer, and there are other qualities. There are many that you should search for before starting work, as for how to find a property and promote it on social media, there are many ways you can learn and use it, as there are free real estate ads on many sites and you can access these sites and you can advertise your property for free like Craiglist, MarketPlace in Facebook and many more. The field of real estate marketing or profit by marketing real estate is a very profitable field and you can start it now.
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