SQL JOINThe JOIN keyword is used in an SQL statement to query data from two or more tables, based on a relationship between certain columns in these tables. Tables in a database are often related to each other with keys.SYNTAX :
To learn more, Visit SQL Self JOIN. SQL JOIN With AS Alias We can use AS aliases with table names to make our query short and clean. For example, -- use alias C for Customers table -- use alias O for Orders table SELECT C.customer_id, C.first_name, O.amount FROM Customers AS...
Example 1: SQL INNER JOIN -- join the Customers and Orders tables-- with customer_id and customer fieldsSELECTCustomers.customer_id, Customers.first_name, Orders.amountFROMCustomersINNERJOINOrdersONCustomers.customer_id = Orders.customer; Run Code Here, the SQL command selects the specified rows ...
2.1. Left Join/ Left Outer Join LEFT OUTER JOIN performs a join starting with the first (left-most) table and then any matching second (right-most) table records. This join gives a result set of all the rows of the left table and matching rows from the right table. If there are no ...
SQL CROSS JOIN example: In this example, we will consider the breakfast menu example again, which we mentioned in the earlier part of the article. Firstly, we will create the two-sample tables which contain the drink and meal names. After then, we will populate them with some sample data...
SQL LEFT JOIN Example Let’s create the Student table having columns, StudentID, Name and CourseID. Make sure that StudentID is a primary key. CREATE TABLE Students (StudentID INT PRIMARY KEY,Name VARCHAR(50),CourseID INT); INSERT INTO Students (StudentID, Name, CourseID)VALUES(1, 'John...
RIGHT JOIN is a keyword, which is used to select all rows from the right table and also the matched values between the two tables. RIGHT JOIN in SQL The RIGHT JOIN basically returns all records from the right table and the matched records from the left table. For example, let’s say,...
In this Spark article, I will explain how to do Full Outer Join (outer, full,fullouter, full_outer) on two DataFrames with Scala Example and Spark SQL.
You can use the CROSS JOIN on as many tables as you want. Let's consider the following example. Assume, that now we need to get all the combinations of not only car models and colors, but also tyres that can go with those cars. ...
This article will provide a full overview, with examples of the SQL Outer join, including the full, right and left outer join as well as cover the union between SQL left and right outer joins.