StudentShare
Contact Us
Sign In / Sign Up for FREE
Search
Go to advanced search...

SQL Queries Issues - Essay Example

Cite this document
Summary
The essay "SQL Queries Issues" focuses on the critical, thorough, and multifaceted analysis of the major issues in SQL queries. In this query, a sub-query has been written in the WHERE clause to filter the existence of any other student on the same day…
Download full paper File format: .doc, available for editing
GRAB THE BEST PAPER95.6% of users find it useful
SQL Queries Issues
Read Text Preview

Extract of sample "SQL Queries Issues"

Download file to see previous pages Student, Events, and Company Data have been joined through Student, Event, Company, Representative, Student_attendance, and Rep_attendance tables to find the result.

SELECT DISTINCT Student.stu_fname, Student.stu_no.
FROM Student, Placement.
WHERE Student.stu_no=Placement.stu_no And placement.pl_tdate>now().

In this query simply student table has been joined with placement and then those records whose placement to date is greater than the current date have been filtered.

SELECT DISTINCT Student.stu_fname, Student.stu_no.
FROM Student, Placement.
WHERE Student.stu_no=Placement.stu_no And Placement.pl_tdate-Placement.pl_fdate>20.

In this query, the student table has been joined with placement and then those records whose period of placement is greater than 20 have been filtered.

SELECT DISTINCT Student.stu_fname, Student.stu_no.
FROM Student.
WHERE Student.stu_no is not in (SELECT Placement.stu_no.
FROM Placement).

I have added a subquery in the WHERE clause to filter those students who have no placement.

SELECT DISTINCT Student.stu_fname, Student.stu_no.
FROM Employment, Student, Placement.
WHERE Student.stu_no=Employment.stu_no And Student.stu_no=Placement.stu_no And Placement.co_id=Employment.co_id.

In this query, I have selected the Employment, Student, and Placement tables and have joined them. In addition to that, I have also patched the Company ID of Placement with the Employment table as well.

...Download file to see next pages Read More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“SQL Queries Essay Example | Topics and Well Written Essays - 750 words”, n.d.)
SQL Queries Essay Example | Topics and Well Written Essays - 750 words. Retrieved from https://studentshare.org/miscellaneous/1510631-sql-queries
(SQL Queries Essay Example | Topics and Well Written Essays - 750 Words)
SQL Queries Essay Example | Topics and Well Written Essays - 750 Words. https://studentshare.org/miscellaneous/1510631-sql-queries.
“SQL Queries Essay Example | Topics and Well Written Essays - 750 Words”, n.d. https://studentshare.org/miscellaneous/1510631-sql-queries.
  • Cited: 0 times

CHECK THESE SAMPLES OF SQL Queries Issues

Important Data Mining Techniquesning

The paper "Important Data Mining Techniques" highlights that information has become a very important asset for almost every organization.... In this scenario, the techniques of data mining could be very helpful in making the best use of this information.... ... ... ... Wal-Mart established its data mining software in the production support infrastructure....
19 Pages (4750 words) Essay

A Systematic Approach to Cost-Based Optimization in Data Mining Environment

For this purpose, the multiple data sets in a KDDMS require support for the complex queries.... Faster response to queries is the prime function of query optimization.... herefore, the present study will focus on the cost-based optimization of the queries in data mining.... , rules are deduced from the restriction clauses of the queries that are received at the database and also, from the outcome that they generate.... t can also be stated that the cost of each query is different for the approaches through which the two syntactically distinct queries generate the same outcome....
13 Pages (3250 words) Dissertation

Methods of Identifying and Preventing SQL Attacks

In this case, the paper will discuss issues related to detection and prevention of SQL attacks.... The implications of SQL injections are issues such as loss of credentials, theft, and fraud, and in other cases, the attackers are able to use the vulnerability to acquire control and corrupt the system hosting the Web application.... Methods of Identifying SQL Attacks Numerous methods can be applied in detecting SQL injection attacks, and one of them is the Intrusion Detection System (IDS), which is based on a machine learning technique and application of a set of distinctive application queries....
5 Pages (1250 words) Research Paper

The Major Goal of LINQ to SQL: Relational Databases and the Programming Logic

is the addition of a data access method known as LINQ, which is meant to be an easy to use replacement for the sql technique for accessing data, not limited to, but including relational data as contained in a database repository such as sql Server, as well as data contained in XML format files....
10 Pages (2500 words) Essay

The Gain of SQL Optimization in Databases

The paper will discuss the significance of fine tuning sql queries.... The performance issues in databases are becoming more frequent.... he first step towards database tuning is to identify the reasons behind the issues and determine the current bottlenecks in the database system.... Also, the issues can occur at the application level of the system.... Usually, the hardware related database performance issues are easier to identify and fix than other factors....
8 Pages (2000 words) Research Paper

DNS and XenApp Deployment

This case study "DNS and XenApp Deployment" presents Citrix XenApp 6.... application, the step by step installation procedures, its benefits, and anticipated shortfalls, and the implementation process that will provide quality and reliable service to both internal and external users.... ... ... ...
8 Pages (2000 words) Case Study

Current Challenges Faced by the Synergy Sol

ssues identified in the current systemAccording to the visit we made, certain issues were found to be corrected on the database system.... he issues which we found out in your system are as follows:The database is found not to be properly built.... The sup-plantation of the old CRIM application with an MS Office Suite plug-in was performed on the desktop that unites by means of a sql connector to the database that is running on an overhauled server....
16 Pages (4000 words) Assignment

The Positive and Negative Impacts of Social Media on the UAE Society

4), consumers have continued to use social media as a platform for complaining or presenting their queries.... The paper 'The Positive and Negative Impacts of Social Media on the UAE Society' is a thrilling example of the research paper on media.... Approximately 57% of citizens in the United Arab Emirates (UAE) support the idea of allowing the UAE government to use social media....
20 Pages (5000 words) Research Paper
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Contact Us