54 635
Assignments Done
Successfully Done
In November 2017
Your physics homework can be a real challenge, and the due date can be really close — feel free to use our assistance and get the desired result.
Be sure that math assignments completed by our experts will be error-free and done according to your instructions specified in the submitted order form.
Our experts will gladly share their knowledge and help you with programming homework. Keep up with the world’s newest programming trends.

Databases | SQL | Oracle | MS Access Answers


81Free Answers by our Experts:

Ask Your question

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Search & Filtering

Consider a database with relations R(A,B,C), S(D,E), and T(F,G).
(i) Give the initial query plan (constructed as in Lecture 12) for the SQL query
WHERE A = 10 AND C = D AND E = F AND A > G;
Then use the heuristics from Lecture 16 to transform the initial query plan into an optimised
(logical) query plan. Perform the transformation step-wise, pushing a single operator over a
single operator in each step, and indicate the heuristics you apply.
Database Systems - (Query) I have duplicate invoices and I need to combine the customer balances. How do I write the equation?
2:again with the column names they should be singular rather than plural, for example StudentCourse not StudentCourses, this will suggest multiplicity and be confusing for the user same should be said for spaces between words and the use of special characters, these too are bad practices.

3: databases without proper documentation for users are also bad practice, so make sure to give ER schemas so users could follow the integrity of data.
I need help on my database homework . I need to write SQL Statements i am not to sure how to do it
SQL Group By
A sql-6-9.sql file has been opened for you.

Write each of the following tasks as a SQL statement in a new line (remember that you can source the file to compare the output reference):

Use the e_store database
Join the products and the reviews tables that would output this:
| id | name | avg_stars |
| 2 | Smartphone | 2.3333 |
| 3 | PC | 3.0000 |
2 rows in set (0.01 sec)

Use the e_store database
Get the average rating of product_id 4. Alias the average result as: avg_rating.
The result should look like this:
| id | avg_rating |
| 4 | 3.5000 |
1 row in set (0.08 sec)
what is the benefits in digital arts and contents of digital arts?
What are 3 good practices of creating databases in SQL?
What are 3 best practices of building SQL statements?