ใช้ COUNT() ร่วม GROUP BY แล้วต่อสตริงด้วย CONCAT()
ตัวอย่าง
mysql> create table DemoTable ( StudentFirstName varchar(20) ); Query OK, 0 rows affected (0.53 sec)
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)
ข้อมูล
mysql> select * from DemoTable;
+------------------+ | StudentFirstName | +------------------+ | Larry | | John | | Larry | | David | | Bob | | Larry | | David | | Larry | +------------------+
นับและแสดง
mysql> select StudentFirstName, concat(count(StudentFirstName),' times') from DemoTable group by StudentFirstName;
+------------------+------------------------------------------+ | StudentFirstName | concat(count(StudentFirstName),' times') | +------------------+------------------------------------------+ | Larry | 4 times | | John | 1 times | | David | 2 times | | Bob | 1 times | +------------------+------------------------------------------+
