PostgreSQL Inner Join

This join is performed by giving an explicit join condition.PostgreSQL inner join is used to join data or records from two or more tables based on matching values ​​in both tables.The inner join will create the resulting set until the condition is satisfied by combining all rows from both tables.The join is taken on the primary key and the foreign key of the two tables.The row will not appear in the output if it does not satisfy the given join condition.
This join is also called as an equi join since and = operators is used to give the join condition

Inner Joins Syntax :

The syntax of the Inner Joins statement is βˆ’


SELECT col_name,...
FROM table_name1 t1  [INNER] JOIN table_name2 t2
ON t1.col_name = t2.col_name

   



PostgreSQL Inner Join Example :

Consider the Customer table with the following records -

ID Name Age Address Salary
1 Aarav 36 Udaipur 35000
2 Vivaan 33 Mumbai 30000
3 Reyansh 28 Chennai 40000
4 Muhammad 29 Udaipur 50000
5 Sai 27 Mumbai 27000


Consider the Order table with the following records -

OID Date CustomerID Amount
102 2019-10-08 00:00:00 3 3000
100 2019-10-08 00:00:00 3 1500
101 2019-11-20 00:00:00 2 1800
103 2018-05-20 00:00:00 4 2500


TEST CASE 1 :- Let us join these two tables using the INNER JOIN as follows

lfcdb=# SELECT  ID, Name, Amount, Date
        FROM Customer
        INNER JOIN Order
        ON Customer.ID = Order.CustomerID;
   


The result for the respective PostgreSQL query is as follows βˆ’

ID Name Amount Date
3 Reyansh 3000 2019-10-08 00:00:00
3 Reyansh 1500 2019-10-08 00:00:00
2 Vivaan 1800 2019-11-20 00:00:00
4 Muhammad 2500 2018-05-20 00:00:00





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