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It is used to combine rows from two or more tables based on a related column between them.
The inner join keyword select all the records which have maching value in both of the tables.
Syntax -
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select * from table1_name
inner join table2_name
on table1_name.table1_column_name= table2_name.table2_column_name;
Note: Table1 must have a primary key and table2 must have a foreign key.
The left join get all the data/record from left table1 and only get match data/record from the right table 2.
If there is no data match from right table 2 then the result will be NULL.
Syntax -
select * from table1_name
left join table2_name
on table1_name.table1_column_name= table2_name.table2_column_name;
Note: Table1 must have a primary key and table2 must have a foreign key.
The right join get all the data/record from right table 2 and only get match data/record from the left table 1 table.
If there is no data match from left table 1 then the result will be NULL.
Syntax -
select * from table1_name
right join table2_name
on table1_name.table1_column_name= table2_name.table2_column_name;
Note: Table1 must have a primary key and table2 must have a foreign key.
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