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Counting same strings in a new MySQL column?
Use COUNT() for this. Let us first create a table −
mysql> create table DemoTable ( StudentFirstName varchar(20) ); Query OK, 0 rows affected (0.53 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable values('Larry');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('Larry');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('David');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Larry');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('David');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable values('Larry');
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output −
+------------------+ | StudentFirstName | +------------------+ | Larry | | John | | Larry | | David | | Bob | | Larry | | David | | Larry | +------------------+ 8 rows in set (0.00 sec)
Following is the query to count same strings in MySQL −
mysql> select StudentFirstName,concat(count(StudentFirstName),' times') from DemoTable group by StudentFirstName;
This will produce the following output −
+------------------+------------------------------------------+ | StudentFirstName | concat(count(StudentFirstName),' times') | +------------------+------------------------------------------+ | Larry | 4 times | | John | 1 times | | David | 2 times | | Bob | 1 times | +------------------+------------------------------------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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