SQL - UNION Syntax

SELECT column_name(s) FROM table1
UNION
SELECT column_name(s) FROM table2;

Note: The UNION operator selects only distinct values by default. To allow duplicate values, use the ALL keyword with UNION.

SQL - INNER JOIN Example

The following SQL statement will return all customers with orders:

Example

SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
INNER JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
ORDER BY Customers.CustomerName;

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Note: The INNER JOIN keyword selects all rows from both tables as long as there is a 

match between the columns. If there are rows in the "Customers" table that do not have matches in "Orders", these customers will NOT be listed.

SQL - INNER JOIN Syntax

SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name=table2.column_name;

or:

SELECT column_name(s)
FROM table1
JOIN table2
ON table1.column_name=table2.column_name;

PS! INNER JOIN is the same as JOIN.

Different SQL JOINs

Before we continue with examples, we will list the types of the different SQL JOINs you can use:

• INNER JOIN: Returns all rows when there is at least one match in BOTH tables.

• LEFT JOIN: Return all rows from the left table, and the matched rows from the right table.

• RIGHT JOIN: Return all rows from the right table, and the matched rows from the left table.

• FULL JOIN: Return all rows when there is a match in ONE of the tables.

SQL - NOT BETWEEN Operator with Text Value Example

The following SQL statement selects all products with a ProductName beginning with any of the letter NOT BETWEEN 'C' and 'M':

Example

SELECT * FROM Products
WHERE ProductName NOT BETWEEN 'C' AND 'M';

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