How to find string count of a particular id in a column using a MySQL query?

For this, use the CHAR_LENGTH() function in MySQL. Let us first create a table −

mysql> create table DemoTable    (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Subject longtext    ); Query OK, 0 rows affected (1.17 sec)

Now you can insert some records in the table using insert command −

mysql> insert into DemoTable(Subject) values('MySQL,MongoDB'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Subject) values('MySQL,MongoDB'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Subject) values('MySQL'); Query OK, 1 row affected (0.15 sec) Display all records from the table using select statement : mysql> select *from DemoTable;

Output

+----+---------------+ | Id | Subject | +----+---------------+ | 1 | MySQL,MongoDB | | 2 | MySQL,MongoDB | | 3 | MongoDB | | 4 | MySQL | +----+---------------+ 4 rows in set (0.00 sec)

Following is the query to find string count with a MySQL query of a particular id in a column. We are checking for id 1 here −

mysql> select Id,char_length(Subject) - char_length(REPLACE((Subject), ',', ''))+1   AS FreqSubject from DemoTable WHERE char_length(Subject) > 0 AND Id = 1;

Output

+----+-------------+ | Id | FreqSubject | +----+-------------+ | 1 | 2 | +----+-------------+ 1 row in set (0.02 sec)