What is SQL? What are joins in SQL?

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SQL (Structured Query Language) is a standard programming language used to manage and manipulate relational databases. It allows you to create, read, update, and delete (CRUD) data in tables.

Common SQL commands include:

• SELECT – retrieve data

• INSERT – add data

• UPDATE – modify data

• DELETE – remove data

• CREATE TABLE – define new tables

What are Joins in SQL?

Joins are used to combine rows from two or more tables based on a related column between them, typically a foreign key.

Types of Joins:

1. INNER JOIN
   Returns rows that have matching values in both tables.

2. LEFT JOIN (or LEFT OUTER JOIN)
   Returns all rows from the left table, and matched rows from the right table. If no match, NULLs are returned from the right side.

3. RIGHT JOIN (or RIGHT OUTER JOIN)
   Returns all rows from the right table, and matched rows from the left table. Unmatched left side returns NULLs.

4. FULL JOIN (or FULL OUTER JOIN)
   Returns all rows when there is a match in one of the tables. Rows without matches will have NULLs.

Summary:
SQL is essential for database management. Joins let you query data across multiple related tables, making it powerful for complex data analysis.

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