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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)
Updated on: 30-Jul-2019
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