GROUP BY ক্লজ ব্যবহার করে MySQL ভিউ তৈরি করা

সিনট্যাক্স

CREATE OR REPLACE VIEW view_name AS
select_statements FROM table
GROUP BY expression1, expression2, ... expression_n;

উদাহরণ

Student_info বেস টেবিল:

mysql> SELECT * FROM Student_info;
+------+---------+------------+------------+
| id   | Name    | Address    | Subject    |
+------+---------+------------+------------+
|  101 | YashPal | Amritsar   | History    |
|  105 | Gaurav  | Chandigarh | Literature |
|  125 | Raman   | Shimla     | Computers  |
|  130 | Ram     | Jhansi     | Computers  |
|  132 | Shyam   | Chandigarh | Economics  |
|  133 | Mohan   | Delhi      | Computers  |
+------+---------+------------+------------+

১. Subject অনুযায়ী গ্রুপিং:

mysql> CREATE OR REPLACE VIEW Info AS
    -> SELECT Subject, COUNT(*) FROM Student_info GROUP BY Subject;
Query OK, 0 rows affected (0.10 sec)

mysql> SELECT * FROM info;
+------------+----------+
| Subject    | COUNT(*) |
+------------+----------+
| Computers  |        3 |
| Economics  |        1 |
| History    |        1 |
| Literature |        1 |
+------------+----------+

২. Subject এবং Name অনুযায়ী গ্রুপিং (দুই কলাম):

mysql> CREATE OR REPLACE VIEW Info AS
    -> SELECT Subject, Name, COUNT(Subject)
    -> FROM Student_info GROUP BY Subject, Name;
Query OK, 0 rows affected (0.05 sec)

mysql> SELECT * FROM info;
+------------+---------+----------------+
| Subject    | Name    | COUNT(Subject) |
+------------+---------+----------------+
| Computers  | Mohan   |              1 |
| Computers  | Ram     |              1 |
| Computers  | Raman   |              1 |
| Economics  | Shyam   |              1 |
| History    | YashPal |              1 |
| Literature | Gaurav  |              1 |
+------------+---------+----------------+

GROUP BY ক্লজ সারিগুলো কলামের মান অনুযায়ী সমষ্টিগত সারিতে রূপান্তর করে।