CIS 515 Discussion post responses.
Respond
to the colleagues posts regarding
:
· A relational Database Model allows database users to analyze data thoroughly. To accomplish this, advanced commands such as UNION and INTERSECT may be used. Describe a business scenario where a UNION relational set operator may be used to merge two similar data sets. Within the context of your business scenario, analyze the analysis and data consistency advantages of using a UNION operator rather than simply merging two data sets into one result table.
VH’s post states the following:
A relational Database Model allows database users to analyze data thoroughly. To accomplish this, advanced commands such as UNION and INTERSECT may be used. Describe a business scenario where a UNION relational set operator may be used to merge two similar data sets. Within the context of your business scenario, analyze the analysis and data consistency advantages of using a UNION operator rather than simply merging two data sets into one result table.
Union command in the SQL combines with the results of two or more SELECT statements. In order for them to work each statement have to produce the same number of column. Data types have to be the same and the columns should be in the same order. For example, subset of employee information have to be selected from multiple tables within the database. Regardless of the department where the data is coming from hence employees for work.
SQL statement looks like this:
SELECT FName, LName, EEID, Position, Salary; FROM Finance; WHERE Salary>= 2500 UNION.
In a relational database model, the data can be analyzed by using the advance commands like UNION and INTERSECT. In a UNION relational set operator are used to with the combination of consumers’ data or data across database or across servers. UNION command have the ability to multiple tables with datasets that have the similar structures or vital information about the consumers or employees into one combined datasets.
Suppose you are tasked with finding common data elements amongst various data sets. Specify how an INTERSECT operator may assist you in accomplishing this task. Construct a query that can perform the same function as the INTERSECT operator without using the "INTERSECT" syntax within the query.
INTERSECT operator is almost the same as UNION command but the difference is the two SQL statements. UNION can act like an OR operator as well while INTERSECT command can act by an AND operator. See below how UNION query can function the same performance with the INTERSECT operator without “INTERSECT” syntax being used in the query.
SELECT EMPLOYEE. FIRSTNAME
EMPLOYEE. LASTNAME
EMPLOYEE.ADDRESS
EMPLOYEE.STATE
FROM EMPLOYEE D
INNER JION CUSTOMER J
ON M. FIRSTNAME=CUSTOMER. FIRSTNAME
AND EMPLOYEE.LASTNAME=CUSTOMER.LASTNAME
AND EMPLOYEE.ADRESSLINE1=CUSTOMER.ADDRESSLINE1
AND EMPLOYEE.CITYSTATE=J.CITY
GROUP BY EMPLOYEE.FIRSTNAME, EMPLOYEE.LASTNAME, EMPLO.
1. CIS 515 Discussion post responses.
Respond
to the colleagues posts regarding
:
· A relational Database Model allows database users to analyze
data thoroughly. To accomplish this, advanced commands such
as UNION and INTERSECT may be used. Describe a business
scenario where a UNION relational set operator may be used to
merge two similar data sets. Within the context of your business
scenario, analyze the analysis and data consistency advantages
of using a UNION operator rather than simply merging two data
sets into one result table.
VH’s post states the following:
A relational Database Model allows database users to analyze
data thoroughly. To accomplish this, advanced commands such
as UNION and INTERSECT may be used. Describe a business
scenario where a UNION relational set operator may be used to
merge two similar data sets. Within the context of your business
scenario, analyze the analysis and data consistency advantages
of using a UNION operator rather than simply merging two data
sets into one result table.
Union command in the SQL combines with the results of two or
more SELECT statements. In order for them to work each
2. statement have to produce the same number of column. Data
types have to be the same and the columns should be in the
same order. For example, subset of employee information have
to be selected from multiple tables within the database.
Regardless of the department where the data is coming from
hence employees for work.
SQL statement looks like this:
SELECT FName, LName, EEID, Position, Salary; FROM
Finance; WHERE Salary>= 2500 UNION.
In a relational database model, the data can be analyzed by
using the advance commands like UNION and INTERSECT. In
a UNION relational set operator are used to with the
combination of consumers’ data or data across database or
across servers. UNION command have the ability to multiple
tables with datasets that have the similar structures or vital
information about the consumers or employees into one
combined datasets.
Suppose you are tasked with finding common data elements
amongst various data sets. Specify how an INTERSECT
operator may assist you in accomplishing this task. Construct a
query that can perform the same function as the INTERSECT
operator without using the "INTERSECT" syntax within the
query.
INTERSECT operator is almost the same as UNION command
but the difference is the two SQL statements. UNION can act
like an OR operator as well while INTERSECT command can
3. act by an AND operator. See below how UNION query can
function the same performance with the INTERSECT operator
without “INTERSECT” syntax being used in the query.
SELECT EMPLOYEE. FIRSTNAME
EMPLOYEE. LASTNAME
EMPLOYEE.ADDRESS
EMPLOYEE.STATE
FROM EMPLOYEE D
INNER JION CUSTOMER J
ON M. FIRSTNAME=CUSTOMER. FIRSTNAME
AND EMPLOYEE.LASTNAME=CUSTOMER.LASTNAME
AND
EMPLOYEE.ADRESSLINE1=CUSTOMER.ADDRESSLINE1
AND EMPLOYEE.CITYSTATE=J.CITY
4. GROUP BY EMPLOYEE.FIRSTNAME,
EMPLOYEE.LASTNAME, EMPLOYEE.ADDRESSLINE1,
EMPLOYEE.CITYSTATEZIPCODE
References:
Israel, M. & Jones, J.S. (2006). MCSE: SQL Server TM 2000
Design Study Guide.
Hoboken, John Wiley & Son.
Thakur, D. (2016). Relational Model. EComputer Notes.
http://ecomputernotes.com/fundamental/what-is-a-
database/relational-model
