Structured-Query-Language-SQL-/INNER JOIN in SQL.txt at main · Unique982/Structured-Query-Language-SQL- · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
INNER JOIN
-> An INNER JOIN is a cross JOIN with some result rows removed by a condition in the query.
.-> EQUIJOIN
.->NON-EQUIJOIN
.->NATURAL JOIN
1.EQUIJOIN
ex:select new.student,student_reg.name from new INNER JOIN student_reg ON new.s_id = new.s_id;
+---------+---------+
| student | name    |
+---------+---------+
| testing | RAM     |
| Sita    | RAM     |
| Ram     | RAM     |
| Hari    | RAM     |
| testing | SITA    |
| Sita    | SITA    |
| Ram     | SITA    |
| Hari    | SITA    |
| testing | HARI    |
| Sita    | HARI    |
| Ram     | HARI    |
| Hari    | HARI    |
| testing | BIMAl   |
| Sita    | BIMAl   |
| Ram     | BIMAl   |
| Hari    | BIMAl   |
| testing | SITA KC |
| Sita    | SITA KC |
| Ram     | SITA KC |
| Hari    | SITA KC |
+---------+---------+

2.NON-EQUIJOIN
ex: select student_reg.name,new.student from student_reg INNER JOIN new ON student_reg.s_id<>new.s_id;
+---------+---------+
| name    | student |
+---------+---------+
| RAM     | testing |
| RAM     | Sita    |
| RAM     | Ram     |
| RAM     | Hari    |
| SITA    | testing |
| SITA    | Sita    |
| SITA    | Ram     |
| SITA    | Hari    |
| HARI    | testing |
| HARI    | Sita    |
| HARI    | Ram     |
| HARI    | Hari    |
| BIMAl   | testing |
| BIMAl   | Sita    |
| BIMAl   | Ram     |
| BIMAl   | Hari    |
| SITA KC | testing |
| SITA KC | Sita    |
| SITA KC | Ram     |
| SITA KC | Hari    |
+---------+---------+

3. NATURAL JOIN
ex:select column_name FROM table1 NATURAL JOIN table2;