In SQL, the SelfJOINoperation allows us to join a table with itself, creating a relationship between rows within the same table. Let's look at an example. SELECTC1.first_nameASFirstPerson, C2.first_nameASSecondPerson, C1.countryFROMCustomers C1, Customers C2WHEREC1.country = C2.countryAND...
Here, the SQL command performs an inner join on theCategoriesandProductstables while assigning the aliasesCandPto them, respectively. SQL INNER JOIN With Three Tables We can also join more than two tables usingINNER JOIN. For example, -- join three tables: Customers, Orders, and ShippingsSELEC...
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 :
LEFT JOIN is a keyword in SQL that allows you to select all the rows from the left table (the one that you mentioned first) and join it with the right table. If there are no matching rows from the right table, then it will fill NULL values for columns from the right table. If you...
As we mentioned, we will use the Sakila sample database for demonstration. In this case, we use the “customer” and “payment” tables. Example 1: LEFT OUTER JOIN Let us start with an OUTER JOIN. Suppose we want to retrieve all the customer information along with their payment information...
Use CROSS JOIN to join three tables in SQL Server 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. ...
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, we have two tables, Table A and Table B, when the left join is applied to these two tables, it would give all records from Table...
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...
Example #2 Insert some data in the ‘student’ and ‘Branch’ tables after creating the above SQL queries. Let’s consider the following SQL queries to insert data: Code: INSERT INTO Branch (branch_id, branch) values ('1', 'Civil'), ...
Getting Started withSQL INNER JOIN Read more about the LEFT JOIN Condition:SQL LEFT JOIN Examples Read more about the RIGHT JOIN Condition:SQL RIGHT JOIN Examples Read about otherSQL Server Join Example Read more about SQL UNION:UNION vs. UNION ALL in SQL Server ...