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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

Combining Table Results

In this chapter, we'll practice with the UNION clause. We'll be working with these two tables:

employees:

contractors:

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Everything was clear?

Section 2. Chapter 6
toggle bottom row

Combining Table Results

In this chapter, we'll practice with the UNION clause. We'll be working with these two tables:

employees:

contractors:

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Everything was clear?

Section 2. Chapter 6
toggle bottom row

Combining Table Results

In this chapter, we'll practice with the UNION clause. We'll be working with these two tables:

employees:

contractors:

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Everything was clear?

In this chapter, we'll practice with the UNION clause. We'll be working with these two tables:

employees:

contractors:

Task

For practice, your task will be to combine the employees and contractors tables using the UNION clause.

After that, from the resulting table, you should retrieve only those IDs that are multiples of 2. Also, you need to retrieve the first_name and last_name columns. Use the syntax WHERE id % 2 = 0. For this task, you need to use subqueries in the FROM section just as shown in the example.

Good luck!

Note

As a result, you should have 3 columns: id (an alias for the ID from both tables), first_name, last_name.

Section 2. Chapter 6
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