This document discusses different types of joins in SQL, including inner, left outer, right outer, and full outer joins. It explains that a join clause combines rows from two or more tables based on related columns. The main types of joins covered are inner joins, which select records that match in both tables; left outer joins, which return all rows from the left table with matching or null rows from the right; right outer joins, which return all rows from the right table with matching or null rows from the left; and full outer joins, which return all rows from both tables including unmatched rows filled with nulls. Syntax examples are provided for each join type.

1. DATABASE
MANAGEMENT
SYSTEM

2. JOINS IN SQL
Presented by: Ahmad Raza
Roll No:BSIT51BF20ROO6

3. SQL JOINS:
A JOIN clause is used to combine rows from two or more tables,
based on a related column between them.
01

4. Types Of Joins
Here are different types of joins:
a) (INNER)JOIN:
b) LEFT (OUTER)JOIN:
c) RIGHT(OUTER)JOIN:
d) FULL(OUTER)JOIN:
02

5. (INNER)JOIN:
The INNER JOIN keyword selects records that have matching values in
both tables.
Syntax:
SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name = table2.column_name;
2.1

6. (INNER)JOIN:
EXAMPLE:
2.1

7. LEFT(OUTER)JOIN:
The LEFT JOIN operation in SQL combines the rows from
two tables, with the result being all the rows from the left
table (table A), and matching rows from the right table (table
B). If there is no match in the right table, the result will
contain NULL values for the columns from the right table.
Syntax:
SELECT column_name(s)
FROM table1
LEFT JOIN table2
ON table1.column_name = table2.column_name;
2.2

8. LEFT(OUTER)JOIN:
2.2

9. RIGHT(OUTER)JOIN:
The RIGHT JOIN operation in SQL combines the rows from two tables, with the
result being all the rows from the right table (table B), and matching rows from
the left table (table A). If there is no match in the left table, the result will contain
NULL values for the columns from the left table.
SYNTAX:
SELECT column_name(s)
FROM table1
RIGHT JOIN table2
ON table1.column_name = table2.column_name;
2.3

10. RIGHT(OUTER)JOIN:
2.3

11. FULL(OUTER)JOIN:
The FULL OUTER JOIN operation in SQL combines the rows from two tables, with the
result being all the rows from both tables, including any unmatched rows. If there is no
match in either the left or the right table, the result will contain NULL values for the
columns from the corresponding table.
SYNTAX:
SELECT column_name(s)
FROM table1
FULL OUTER JOIN table2
ON table1.column_name = table2.column_name
WHERE condition;
2.4

12. FULL(OUTER)JOIN:
2.4