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What is SQL?
SQL (Structured Query Language) is a domain-specific programming language that handles table data. It was developed in the 1970s.
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SQL INSERT INTO statement
Use the INSERT INTO statement to insert a new record into a table with a simple query.
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
SQL has a special operation that helps to change values in cells of the already existing rows – UPDATE statement.
SQL Aggregate functions
The function will take all values from the specified column and produce a single cell as a result.
SQL SET keyword
Set operations combine rows from the result sets of multiple SELECT statements.
A subquery (an inner or nested query) is a query within another SQL query (a main or outer query).
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