What types of table joins are you familiar with in SQL?

In SQL, there are several main types of joins that allow combining data from two or more tables:

• INNER JOIN — returns only the rows with matches in both tables.
• LEFT JOIN (or LEFT OUTER JOIN) — returns all rows from the left table and matching rows from the right; if there are no matches, NULLs will appear in the right table's columns.
• RIGHT JOIN (or RIGHT OUTER JOIN) — returns all rows from the right table and matching rows from the left.
• FULL JOIN (or FULL OUTER JOIN) — returns all rows from both tables, filling in NULLs where there are no matches.
• CROSS JOIN — Cartesian product, returns all possible combinations of rows from both tables.

Example of INNER JOIN in C# using an SQL query:

string query = @"SELECT Orders.OrderID, Customers.CustomerName 
FROM Orders 
INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID";

This query will return orders with customer information for customers who have matching records in both tables.