MySQL में किसी कॉलम में विशिष्ट शब्द कितनी बार आता है, इसकी संख्या कैसे प्राप्त करें?

इसके लिए COUNT() फंक्शन का उपयोग कर सकते हैं।

उदाहरण

टेबल बनाएं:

mysql> create table DemoTable (
    -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
    -> EmployeeName varchar(100)
    -> );
Query OK, 0 rows affected (0.62 sec)

रिकॉर्ड डालें:

mysql> insert into DemoTable(EmployeeName) values('John');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(EmployeeName) values('David');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName) values('Carol');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable(EmployeeName) values('Bob');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(EmployeeName) values('Sam');
Query OK, 1 row affected (0.12 sec)

सभी रिकॉर्ड देखें:

mysql> select * from DemoTable;

आउटपुट

+------------+--------------+
| EmployeeId | EmployeeName |
+------------+--------------+
| 1          | John         |
| 2          | Carol        |
| 3          | David        |
| 4          | Carol        |
| 5          | Carol        |
| 6          | Bob          |
| 7          | Sam          |
+------------+--------------+
7 rows in set (0.00 sec)

विशिष्ट शब्द "Carol" की घटनाओं की संख्या प्राप्त करने की क्वेरी:

mysql> select EmployeeName, count(EmployeeId) as Occurrence from DemoTable where EmployeeName = 'Carol';

आउटपुट

+--------------+------------+
| EmployeeName | Occurrence |
+--------------+------------+
| Carol        | 3          |
+--------------+------------+
1 row in set (0.05 sec)

वैकल्पिक: सभी नामों की गिनती के लिए `SELECT EmployeeName, COUNT(*) FROM DemoTable GROUP BY EmployeeName` उपयोग करें।