The SQL RIGHT JOIN joins two tables based on a common column, and selects records that have matching values in these columns and remaining rows from the right table.
Example
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT JOIN Orders
ON Customers.customer_id = Orders.customer;
Here's how this code works:
Here, the SQL command selects customer_id and first_name columns (from the Customers table) and the amount column (from the Orders table).
And, the result set will contain those rows where there is a match between customer_id (of the Customers table) and customer (of the Orders table) along with all the remaining rows from the Orders table.
Syntax of RIGHT JOIN
The syntax of RIGHT JOIN is:
SELECT columns
FROM table1
RIGHT JOIN table2
ON table1.column_name = table2.column_name;
RIGHT JOIN With WHERE Clause
The SQL command can have an optional WHERE clause with the RIGHT JOIN statement. For example,
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
INNER JOIN Orders
ON Customers.customer_id = Orders.customer
WHERE Orders.amount >= 500;
Here, the SQL command joins two tables and selects rows where the amount is greater than or equal to 500.
SQL RIGHT JOIN With AS Alias
We can use AS aliases inside RIGHT JOIN to make our snippet short and clean. For example,
SELECT C.cat_name, P.prod_title
FROM Category AS C
RIGHT JOIN Products AS P
ON C.cat_id= P.cat_id;
Here, the SQL command selects common rows between Category and Products table.
Right Join Vs Other Joins
We can also use RIGHT OUTER JOIN instead of RIGHT JOIN. Basically, these two clauses are the same.
That means,
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT JOIN Orders
ON Customers.customer_id = Orders.customer;
is similar to
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT OUTER JOIN Orders
ON Customers.customer_id = Orders.customer;
The RIGHT JOIN selects the common rows as well as all the remaining rows from the right table. Whereas the INNER JOIN selects only the common rows between two tables.
Let's take a look at example,
RIGHT JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
INNER JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
INNER JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
The RIGHT JOIN selects the common rows as well as all the remaining rows from the right table. Whereas, the LEFT JOIN selects the common rows as well as all the remaining rows from the left table.
Let's take a look at example,
RIGHT JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
LEFT JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
LEFT JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
The RIGHT JOIN selects the common rows as well as all the remaining rows from the right table. Whereas the FULL OUTER JOIN selects all the rows from both the tables.
Let's take a look at example,
RIGHT JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
RIGHT JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
FULL OUTER JOIN
SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
FULL OUTER JOIN Orders
ON Customers.customer_id = Orders.customer;
Output
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