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Why is a join in SQL so powerful?

By: Raj Sharma | 02 July 2019

N

Nishant V.

27 April 2020

SQL JOINING is so powerful because the SQL JOIN allows you to take Data Across Multiple Sources and Compare it to make changes with little effort on your end that why SQL JOIN is really so Powerful in SQL.


Actually, SQL JOINS are a costly database operation because they require the creation of a cartesian product in memory that means a virtual table is created in memory that has a number of rows that is a multiplication of the number of rows from all the tables that you are joining.


The SQL JOIN used to combines multiple columns from one or more tables in a relational database.


TYPE OF SQL JOIN IN DATABASE

  • INNER JOIN
  • LEFT JOIN or LEFT OUTER JOIN
  • RIGHT JOIN or RIGHT OUTER JOIN
  • FULL JOIN

1 votes

A

Anurag

27 April 2020

Why is a join in SQL so powerful

Join in SQL so powerful - Since Join provides a special power for combining various tables and get the result in combined form based on various conditions. Suppose if there is no concept of joining then its become very difficult to co-relate data from more than one table but with the help of joining we are able to co-relate various tables data and we can perform various operation on those data together with the help of join in SQL. 

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