SQL - Enter and run your own SELECT statements In these exercises, you’ll enter and run your own SELECT statements. To do that, you can open the script for an example that is similar to the statement you need to write, copy the statement into a new SQL tab, and modify the statement. That can save you both time and syntax errors 8. Write a SELECT statement that returns three columns from the Vendors table: vendor_name, vendor_contact_last_name, and vendor_contact_first_name. Then, run this statement to make sure it works correctly. Add an ORDER BY clause to this statement that sorts the result set by last name and then first name, both in ascending sequence. Then, run this state‐ment again to make sure it works correctly. This is a good way to build and test a statement, one clause at a time.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
SQL - Enter and run your own SELECT statements
In these exercises, you’ll enter and run your own SELECT statements. To do that, you can open the script for an example that is similar to the statement you need to write, copy the statement into a new SQL tab, and modify the statement. That can save you both time and syntax errors
8. Write a SELECT statement that returns three columns from the Vendors table: vendor_name, vendor_contact_last_name, and vendor_contact_first_name. Then, run this statement to make sure it works correctly. Add an ORDER BY clause to this statement that sorts the result set by last name and then first name, both in ascending sequence. Then, run this state‐ment again to make sure it works correctly. This is a good way to build and test a statement, one clause at a time.
9. Write a SELECT statement that returns one column from the Vendors table named full_name that joins the vendor_contact_last_name and vendor_contact_first_name columns. Format this column with the last name, a comma, a space, and the first name like this:
Doe, John
Sort the result set by last name and then first name in ascending sequence. Return only the contacts whose last name begins with the letter A, B, C, or E. This should retrieve 41 rows.
10. Write a SELECT statement that returns these column names and data from the Invoices table: Due Date
Invoice Total 10%
Plus 10%
The invoice_due_date column The invoice_total column
10% of the value of invoice_total The value of invoice_total plus 10%
Return only the rows with an invoice total that’s greater than or equal to 500 and less than or equal to 1000. This should retrieve 12 rows. Sort the result set in descending sequence by invoice_due_date.
11. Write a SELECT statement that returns these columns from the Invoices table: invoice_number invoice_total
The invoice_number column The invoice_total column
payment_credit_total balance_due
Sum of the payment_total and credit_total columns
The invoice_total column minus the payment_total and credit_total columns
Return only invoices that have a balance due that’s greater than $50. Sort the result set by balance due in descending sequence. Use the LIMIT clause so the result set contains only the rows with the 5 largest balances.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
