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5. Add a column to the query described in exercise 2 that uses the RANK() function to return a column named BalanceRank that ranks the balance due in descending order.

5. Add a column to the query described in exercise 2 that uses the RANK() function to return a column named BalanceRank that ranks the balance due in descending order.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Answer question 5

## Exercises 1. **Select Statement for Vendor Contact Information:** - Write a `SELECT` statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by last initial (for example, “John S.”). The second column, Phone, is the VendorPhone column without the area code. Only return rows for those vendors in the 559 area code. Sort the result set by first name, then last name. 2. **Invoice Number and Balance Due:** - Write a `SELECT` statement that returns the InvoiceNumber and balance due for every invoice with a non-zero balance and an InvoiceDueDate that’s less than 30 days from today. 3. **Modify Search Expression for Invoice Due Date:** - Modify the search expression for InvoiceDueDate from the solution for exercise 2. Rather than 30 days from today, return invoices due before the last day of the current month. 4. **Summary Query Using the CUBE Operator:** - Write a summary query that uses the `CUBE` operator to return LineItemSum (which is the sum of InvoiceLineItemAmount) grouped by Account (an alias for AccountDescription) and State (an alias for VendorState). Use the `CASE` and `GROUPING` function to substitute the literal value “*ALL*” for the summary rows with null values. 5. **Add RANK() to Existing Query:** - Add a column to the query described in exercise 2 that uses the `RANK()` function to return a column named BalanceRank that ranks the balance due in descending order.
Transcribed Image Text:## Exercises 1. **Select Statement for Vendor Contact Information:** - Write a `SELECT` statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by last initial (for example, “John S.”). The second column, Phone, is the VendorPhone column without the area code. Only return rows for those vendors in the 559 area code. Sort the result set by first name, then last name. 2. **Invoice Number and Balance Due:** - Write a `SELECT` statement that returns the InvoiceNumber and balance due for every invoice with a non-zero balance and an InvoiceDueDate that’s less than 30 days from today. 3. **Modify Search Expression for Invoice Due Date:** - Modify the search expression for InvoiceDueDate from the solution for exercise 2. Rather than 30 days from today, return invoices due before the last day of the current month. 4. **Summary Query Using the CUBE Operator:** - Write a summary query that uses the `CUBE` operator to return LineItemSum (which is the sum of InvoiceLineItemAmount) grouped by Account (an alias for AccountDescription) and State (an alias for VendorState). Use the `CASE` and `GROUPING` function to substitute the literal value “*ALL*” for the summary rows with null values. 5. **Add RANK() to Existing Query:** - Add a column to the query described in exercise 2 that uses the `RANK()` function to return a column named BalanceRank that ranks the balance due in descending order.
**Step 2** Write a SELECT statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by the last initial (for example, "John S."). The second column, Phone, is the VendorPhone column without the area code. Only return rows for those vendors in the 559 area code. **SQL Server Code:** ```sql select VendorContactFName + ' ' + left(VendorContactLName,1) + '.' as Contact, RIGHT(VendorPhone,8) as Phone from Vendors where substring(vendorphone,2,3)=559 order by VendorContactFName, VendorContactLName; ``` **Explanation:** - The first column, Contact, is the vendor contact name in this format. - The second column, Phone, is the VendorPhone column without the area code. - The 4th line ensures it only returns rows for those vendors in the 559 area code. - The last line sorts the result set by first name, then last name. **Code Screenshot:** ```sql select VendorContactFName + ' ' + left(VendorContactLName,1) + '.' as Contact, RIGHT(VendorPhone, 8) as Phone from Vendors where substring(vendorphone,2,3)=559 order by VendorContactFName, VendorContactLName; ```
Transcribed Image Text:**Step 2** Write a SELECT statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by the last initial (for example, "John S."). The second column, Phone, is the VendorPhone column without the area code. Only return rows for those vendors in the 559 area code. **SQL Server Code:** ```sql select VendorContactFName + ' ' + left(VendorContactLName,1) + '.' as Contact, RIGHT(VendorPhone,8) as Phone from Vendors where substring(vendorphone,2,3)=559 order by VendorContactFName, VendorContactLName; ``` **Explanation:** - The first column, Contact, is the vendor contact name in this format. - The second column, Phone, is the VendorPhone column without the area code. - The 4th line ensures it only returns rows for those vendors in the 559 area code. - The last line sorts the result set by first name, then last name. **Code Screenshot:** ```sql select VendorContactFName + ' ' + left(VendorContactLName,1) + '.' as Contact, RIGHT(VendorPhone, 8) as Phone from Vendors where substring(vendorphone,2,3)=559 order by VendorContactFName, VendorContactLName; ```
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## Exercises 1. **Query for Vendor Contact and Phone** - Write a `SELECT` statement that returns two columns from the Vendors table. - The first column, `Contact`, should be formatted as the vendor's first name followed by the last initial (e.g., "John S."). - The second column, `Phone`, should display the VendorPhone without the area code. - Return rows only for vendors with a 559 area code. - Sort the results by first name, then last name. 2. **Query for Invoice Details** - Write a `SELECT` statement to fetch the `InvoiceNumber` and `balance due` for every invoice with: - A non-zero balance. - An `InvoiceDueDate` that is less than 30 days from today. 3. **Modify InvoiceDueDate Search Expression** - Alter the search expression from exercise 2 so that invoices due before the last day of the current month are returned, rather than those due in the next 30 days. 4. **Summary Query using CUBE Operator** - Create a query using the `CUBE` operator to return `LineItemSum` (from `InvoiceLineItemAmount`) grouped by: - `Account` (alias as `AccountDescription`). - `State` (alias as `VendorState`). - Use the `CASE` and `GROUPING` functions to replace null values with the literal `*ALL*`. 5. **Add RANK Column to Query** - Enhance the query from exercise 2 by adding a column that employs the `RANK()` function. - This should create a column named `BalanceRank` to rank the balance due in descending order.
Transcribed Image Text:## Exercises 1. **Query for Vendor Contact and Phone** - Write a `SELECT` statement that returns two columns from the Vendors table. - The first column, `Contact`, should be formatted as the vendor's first name followed by the last initial (e.g., "John S."). - The second column, `Phone`, should display the VendorPhone without the area code. - Return rows only for vendors with a 559 area code. - Sort the results by first name, then last name. 2. **Query for Invoice Details** - Write a `SELECT` statement to fetch the `InvoiceNumber` and `balance due` for every invoice with: - A non-zero balance. - An `InvoiceDueDate` that is less than 30 days from today. 3. **Modify InvoiceDueDate Search Expression** - Alter the search expression from exercise 2 so that invoices due before the last day of the current month are returned, rather than those due in the next 30 days. 4. **Summary Query using CUBE Operator** - Create a query using the `CUBE` operator to return `LineItemSum` (from `InvoiceLineItemAmount`) grouped by: - `Account` (alias as `AccountDescription`). - `State` (alias as `VendorState`). - Use the `CASE` and `GROUPING` functions to replace null values with the literal `*ALL*`. 5. **Add RANK Column to Query** - Enhance the query from exercise 2 by adding a column that employs the `RANK()` function. - This should create a column named `BalanceRank` to rank the balance due in descending order.
### Step 2 **Task:** Write a SELECT statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by last initial (for example, "John S."). The second column, Phone, is the VendorPhone column without the area code. Only return rows for which the area code is 559. **SQL Server Code:** ```sql select VendorContactFName + ' ' + left(VendorContactLName, 1) + '.' as Contact, RIGHT(VendorPhone, 8) as Phone from Vendors where substring(vendorphone, 2, 3) = 559 order by VendorContactFName, VendorContactLName; ``` **Explanation:** - The first column, Contact, is the vendor contact name formatted as first name with last initial. - The second column, Phone, shows the VendorPhone without the area code. - The 4th line ensures the query returns only rows where the area code is 559. - The last line orders the result set by first name, then last name. **Code Screenshot:** (Note: The code is shown again as an image with SQL formatting applied for easy reference.)
Transcribed Image Text:### Step 2 **Task:** Write a SELECT statement that returns two columns based on the Vendors table. The first column, Contact, is the vendor contact name in this format: first name followed by last initial (for example, "John S."). The second column, Phone, is the VendorPhone column without the area code. Only return rows for which the area code is 559. **SQL Server Code:** ```sql select VendorContactFName + ' ' + left(VendorContactLName, 1) + '.' as Contact, RIGHT(VendorPhone, 8) as Phone from Vendors where substring(vendorphone, 2, 3) = 559 order by VendorContactFName, VendorContactLName; ``` **Explanation:** - The first column, Contact, is the vendor contact name formatted as first name with last initial. - The second column, Phone, shows the VendorPhone without the area code. - The 4th line ensures the query returns only rows where the area code is 559. - The last line orders the result set by first name, then last name. **Code Screenshot:** (Note: The code is shown again as an image with SQL formatting applied for easy reference.)
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