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Question: Display all the LastNames from the Customers table and any associated OrdersIDs from the Orders Table. Show the LastName even if they do not have any associated orders. Order the results by LastName in ascending order.
database systems1. what is an sql injection attack? explain how it works and what precautions must be taken to prevent
consider the following set of database tables. the diagram shows a database made up of 6 tables with all primary keys
As DBA, your manager called a meeting and asked why there are so many orders for customers that don't exist in the customer table. Write query which would shows which customers were missing for existing orders. Use a join or a subquery.
Write a query to display using the employees table the EMPLOYEE_ID, FIRST_NAME, LAST_NAME and HIRE_DATE of every employee who was hired after to 1 January, 1995.
Roles and Profiles are used by Oracle to define and control access and privileges of groups of users. Compare and contrast the concepts of role and profile.
Define a one-to-many relationship between the Customer table and Orders table. Right click in the window and select Show table. Select the referential integrity option and both cascade options for the relationships. Save the relationship.
Write summary query which uses CUBE operator to return LineItemSum (which is the sum of InvoiceLineItemAmount) group by Account(an alias for AccountDesciption).
Write given queries in SQL and relational algebra: Determine cities from which one can fly to Toronto with one change of planes, and using same type of the aircraft for both legs of trip.
Identify which data components are the entities and attributes, and the relationship between each using an object representation diagram through the use of graphical tools such as Microsoft Visio, or an open source alternative such as Dia.
drop the tables you are creating (in case they've already been created within the schema I'm using).
Explain entity integrity and referential integrity rules in relational model.show how these aer realized in sql
Write an SQL statement to produce a single column called ItemLocation that combines the SKU_Description,the phrase "is located in."
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