Category: Join

Union and Join are SQL clauses used to perform operations on more than one table in a relational database management system (RDBMS). They produce a result by combining data from two or more tables. But, the way of combining the data from two or more relations differ in both clauses. Before making a comparison, we are going to discuss…

MySQL has mainly two kinds of joins named LEFT JOIN and RIGHT JOIN. The main difference between these joins is the inclusion of non-matched rows. The LEFT JOIN includes all records from the left side and matched rows from the right table, whereas RIGHT JOIN returns all rows from the right side and unmatched rows from…

When we combine rows of two or more tables based on a common column between them, this operation is called joining. A natural join is a type of join operation that creates an implicit join by combining tables based on columns with the same name and data type. It is similar to the INNER or LEFT JOIN, but we…

The process is called joining when we combine two or more tables based on some common columns and a join condition. An equijoin is an operation that combines multiple tables based on equality or matching column values in the associated tables. We can use the equal sign (=) comparison operator to refer to equality in the WHERE clause. This joining…

UPDATE query in MySQL is a DML statement used for modifying the data of a table. The UPDATE query must require the SET and WHERE clause. The SET clause is used to change the values of the column specified in the WHERE clause. JOIN clause in MySQL is used in the statement to retrieve data…

DELETE query is a sub-part of data manipulation language used for removing the rows from tables. How to delete join in MySQL is a very popular question during the interviews. It is not an easy process to use the delete join statements in MySQL. In this section, we are going to describe how you can delete records…

A SELF JOIN is a join that is used to join a table with itself. In the previous sections, we have learned about the joining of the table with the other tables using different JOINS, such as INNER, LEFT, RIGHT, and CROSS JOIN. However, there is a need to combine data with other data in the…

MySQL CROSS JOIN is used to combine all possibilities of the two or more tables and returns the result that contains every row from all contributing tables. The CROSS JOIN is also known as CARTESIAN JOIN, which provides the Cartesian product of all associated tables. The Cartesian product can be explained as all rows present…

The Right Join is used to joins two or more tables and returns all rows from the right-hand table, and only those results from the other table that fulfilled the join condition. If it finds unmatched records from the left side table, it returns Null value. It is similar to the Left Join, except it…

The Left Join in MySQL is used to query records from multiple tables. This clause is similar to the Inner Join clause that can be used with a SELECT statement immediately after the FROM keyword. When we use the Left Join clause, it will return all the records from the first (left-side) table, even no…