SQL unirse
SELECT columns
FROM table1
INNER JOIN table2
ON table1.column = table2.column;
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SELECT columns
FROM table1
INNER JOIN table2
ON table1.column = table2.column;Suppose we are having three table named as
Student_details
Attendance_details
Batch_details
And we have to apply join these three tables for fetching records
Example query:
select column_names
from Student_detail as s join Attendance_details as a on
s.s_id = a.s_id join Batch_details as b on
s.s_id = b.s_id;
Here in the above example we implemented simple join but you change it with own join requirements.SELECT Customers.customer_id, Customers.first_name, Orders.amount
FROM Customers
JOIN Orders
ON Customers.customer_id = Orders.customer;LEFT JOIN
All rows from the left table will be returned, even if there's no matching row in the right table.
RIGHT JOIN
All rows from the right table will be returned, even if there's no matching row in the left table.
INNER JOIN
Only returns rows where there's a matching row in both tables.SELECT * From Table1
2
3
SELECT Employee.EmpID, Employee.EmpFname, Employee.EmpLname, Projects.ProjectID, Projects.ProjectName
FROM Employee
INNER JOIN Projects ON Employee.EmpID=Projects.EmpID;