MySQL कॉलम में कोई स्ट्रिंग कितनी बार आती है, इसकी गिनती कैसे प्राप्त करें?

उदाहरण

टेबल बनाएं:

mysql> create table DemoTable704 (SubjectName text);
Query OK, 0 rows affected (0.58 sec)

रिकॉर्ड डालें:

mysql> insert into DemoTable704 values('Introduction to MySQL');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable704 values('Introduction to MongoDB');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable704 values('Introduction to MySQL');
Query OK, 1 row affected (0.31 sec)
mysql> insert into DemoTable704 values('Introduction to Java');
Query OK, 1 row affected (0.39 sec)
mysql> insert into DemoTable704 values('Introduction to MongoDB');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable704 values('Introduction to MySQL');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable704 values('Introduction to C');
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable704 values('Introduction to Spring and Hibernate');
Query OK, 1 row affected (0.12 sec)

सभी रिकॉर्ड देखें:

mysql> select * from DemoTable704;

आउटपुट

+--------------------------------------+
| SubjectName                          |
+--------------------------------------+
| Introduction to MySQL                |
| Introduction to MongoDB              |
| Introduction to MySQL                |
| Introduction to Java                 |
| Introduction to MongoDB              |
| Introduction to MySQL                |
| Introduction to C                    |
| Introduction to Spring and Hibernate |
+--------------------------------------+
8 rows in set (0.00 sec)

कॉलम में स्ट्रिंग कितनी बार आती है, इसकी गिनती प्राप्त करने की क्वेरी:

mysql> SELECT COUNT(*) from DemoTable704 WHERE SubjectName LIKE '%Introduction to MySQL%';

आउटपुट

+----------+
| COUNT(*) |
+----------+
| 3        |
+----------+
1 row in set (0.00 sec)

वैकल्पिक: सभी अद्वितीय मानों की गिनती के लिए `SELECT SubjectName, COUNT(*) FROM DemoTable704 GROUP BY SubjectName` उपयोग करें।