Lessons

What is SQL?

SQL (Structured Query Language) is a domain-specific programming language that handles table data. It was developed in the 1970s.
Part of
SQL and Databases tracks
What is SQL?
Practice made easy: learn
to code with Hyperskill
Learn free
SQL INSERT INTO statement
Lessons

SQL INSERT INTO statement

Use the INSERT INTO statement to insert a new record into a table with a simple query.
SQL DELETE statement
Lessons

SQL DELETE statement

To delete all the data from the table but not the table itself, use a query with a DELETE FROM statement.
SQL UPDATE statement
Lessons

SQL UPDATE statement

SQL has a special operation that helps to change values in cells of the already existing rows – UPDATE statement.
SQL Aggregate functions
Lessons

SQL Aggregate functions

The function will take all values from the specified column and produce a single cell as a result.
SQL SET keyword
Lessons

SQL SET keyword

Set operations combine rows from the result sets of multiple SELECT statements.
SQL Subquiries
Lessons

SQL Subquiries

A subquery (an inner or nested query) is a query within another SQL query (a main or outer query).