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Intermediate SQL
course content

Course Content

Intermediate SQL

Intermediate SQL

1. Grouping
GROUP BYOrder of StatementsTotal Ride Time for Each Subway Line ChallengeAverage Student's Grade ChallengeSearching for the Top Math Students ChallengeHAVINGSeveral Aggregate Functions in the QueryMore Complex Filtering
2. Nested Subqueries
Nested QueriesNon-tech Department Employees ChallengeUsing Inner Subqueries in the FROM SectionEmployees With More Than Average Salary ChallengeUNION ClauseCombining Table Results
3. Joining Tables
JOIN 2 TablesGet Category By Product PriceGet Minimum Price By CategoryGet Product Amount By CategoryLEFT, RIGHT and INNER JOINsTable Join PracticeFULL JOIN Usage
4. DDL and DML in SQL
CREATE and ConstraintsALTER and INSERT OperationsDROP and TRUNCATEUPDATE and DELETE

bookEmployees With More Than Average Salary Challenge

I mentioned earlier that when a subquery is written in the WHERE section, we can use the IN operator and comparison operators.

For example, like this:

Following a similar algorithm, you'll need to complete the following task.

We'll be working with the employees table, which looks like this:

Task

Find employees whose salary is above the average salary of all employees using a subquery in the WHERE section.

The resulting table should have 3 columns: first_name, last_name, and salary. Then, sort the result by salary from highest to lowest using ORDER BY.

Note

This syntax can be used as a great alternative to the HAVING clause.

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Section 2. Chapter 4
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bookEmployees With More Than Average Salary Challenge

I mentioned earlier that when a subquery is written in the WHERE section, we can use the IN operator and comparison operators.

For example, like this:

Following a similar algorithm, you'll need to complete the following task.

We'll be working with the employees table, which looks like this:

Task

Find employees whose salary is above the average salary of all employees using a subquery in the WHERE section.

The resulting table should have 3 columns: first_name, last_name, and salary. Then, sort the result by salary from highest to lowest using ORDER BY.

Note

This syntax can be used as a great alternative to the HAVING clause.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 4
toggle bottom row

bookEmployees With More Than Average Salary Challenge

I mentioned earlier that when a subquery is written in the WHERE section, we can use the IN operator and comparison operators.

For example, like this:

Following a similar algorithm, you'll need to complete the following task.

We'll be working with the employees table, which looks like this:

Task

Find employees whose salary is above the average salary of all employees using a subquery in the WHERE section.

The resulting table should have 3 columns: first_name, last_name, and salary. Then, sort the result by salary from highest to lowest using ORDER BY.

Note

This syntax can be used as a great alternative to the HAVING clause.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

I mentioned earlier that when a subquery is written in the WHERE section, we can use the IN operator and comparison operators.

For example, like this:

Following a similar algorithm, you'll need to complete the following task.

We'll be working with the employees table, which looks like this:

Task

Find employees whose salary is above the average salary of all employees using a subquery in the WHERE section.

The resulting table should have 3 columns: first_name, last_name, and salary. Then, sort the result by salary from highest to lowest using ORDER BY.

Note

This syntax can be used as a great alternative to the HAVING clause.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 2. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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