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EquiJoin - (MySQL Join)

EquiJoin is a type of join operation that is used to match rows between two tables based on a specified column. In MySQL, EquiJoin is performed using the JOIN keyword. In this tutorial, we'll discuss EquiJoin in MySQL, including its syntax, example, output, explanation, use, important points, and summary.

Syntax

The syntax for EquiJoin in MySQL is as follows:

SELECT *
FROM table1
JOIN table2
ON table1.column_name = table2.column_name;

In this syntax, "table1" and "table2" are the names of the tables being joined, and "column_name" is the name of the column used to match rows between the tables.

Example

Let's say we have two tables: "orders" and "customers". The "orders" table contains information about customer orders, while the "customers" table contains information about customers. We want to join these tables based on the "customer_id" column. Here's how we can implement it:

SELECT *
FROM orders
JOIN customers
ON orders.customer_id = customers.customer_id;

Output

When we run the example code above, we'll get a table containing all the columns from both the "orders" and "customers" tables, with only the rows where the "customer_id" from both tables match.

Explanation

In the example above, we first specified the tables we wanted to join: "orders" and "customers". We then used the "JOIN" keyword to specify that we wanted to perform a join operation between the two tables. Finally, we specified the column we wanted to match rows on: "customer_id".

Use

EquiJoin in MySQL is used when you want to combine information from two or more tables based on a specified column. This can be useful when you need to query information from multiple tables in a database.

Important Points

  • In order to perform a join operation in MySQL, the tables being joined must have at least one column in common.
  • EquiJoin is just one type of join operation in MySQL. Other types of join operations include Inner Join, Outer Join, and Cross Join.
  • When performing an EquiJoin, it's important to specify the table and column names correctly. Otherwise, the join operation may not return the expected results.

Summary

In this tutorial, we discussed EquiJoin in MySQL, including its syntax, example, output, explanation, use, important points, and summary. Using EquiJoin, you can combine information from two or more tables based on a specified column. When using EquiJoin, it's important to specify the table and column names correctly to ensure that the join operation returns the expected results.

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