Right Join in PHP Source Code

What is right join?

Right join shows all rows from the right table and shows only matching rows from the left table.

RegistrationNo Marks
T4Tutorials1 77
T4Tutorials2 32
T4Tutorials4 55

Table: Exams

Inner join shows results from both tables where there is any match between columns in both tables.

RegistrationNo Fee
T4Tutorials1 1000
T4Tutorials2 2000

Table: Accounts

Now, we have two different tables. If we want to show the record of both tables in one single table then we can use right join to join both two tables.

Query.

SELECT Exams.RegistrationNo, Exams.Marks, Accounts.Fee FROM Exams RIGHT JOIN Accounts ON Exams.RegistrationNo =  Accounts.RegistrationNo

In this query Accounts is the right table.

 

RegistrationNo Marks Fee
T4Tutorials1 77 1000
T4Tutorials2 32 2000

Table: Generated after Right Join.

Right Join Program Example in PHP.

Database for the code is shown in the figure below.

right join php mysql
Figure: Table brand and Table product, Database is t4.
Sr.# PHP code with query Description
 

1

$connect = mysqli_connect(“localhost”, “root”, “”, “ali”); Database connection between php page and sql data base, “ali” is the database name and server is “localgost”

 

 

 

2

$sql = “SELECT * FROM brand RIGHT JOIN prouct ON   brand.br_id = prouct.pr_name “; First of all we give the “$sql” variable and store the data form tow table using the “RIGHT JOIN”.

It’s the “RIGHT JOIN” query to get the right side Colum data in my browser page.

 

3

 

$result = mysqli_query($connect, $sql);

The “$result” variable get the database connection and SQL query.

“mysqli_query ()” is the function.  The “mysqli_query ()” perform the query against the database.

 

4

 

if (mysqli_num_rows($result) > 0)

It’s” if” condition used to compare the “$result” variable and any values, if the “$result” variable is grater then “0” then run the “mysqli_num_rows ()” function.

“mysqli_num_rows ()” return the number of values in result set.

 

 

5

 

while ($row = mysqli_fetch_array($result))

When the if condition is true then the “while” loop run,

The “while” loop include the “$row” variable and the”mysqli_fetch_array()” fuuction. The “mysqli_fetch_array()” function fetch data form database.

6 <?php echo $row[“br_name”]; ?> “$row” variable Show data in web page form databases
7     <?php echo $row[“pr_name”]; ?> “$row” variable Show data in web page form databases
Fazal Rehman Shamil
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