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MySQL query to alphabetize records and count the duplicates?
For this, use both GROUP BY and ORDER BY clause. Let us first create a table −
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentGrade char(1) ); Query OK, 0 rows affected (0.87 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentGrade) values('A');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentGrade) values('F');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentGrade) values('C');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable(StudentGrade) values('A');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(StudentGrade) values('F');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentGrade) values('F');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(StudentGrade) values('B');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable(StudentGrade) values('C');
Query OK, 1 row affected (0.13 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+-----------+--------------+ | StudentId | StudentGrade | +-----------+--------------+ | 1 | A | | 2 | F | | 3 | C | | 4 | A | | 5 | F | | 6 | F | | 7 | B | | 8 | C | +-----------+--------------+ 8 rows in set (0.00 sec)
Here is the query to alphabetize and count −
mysql> select StudentGrade,count(StudentId) as Frequency from DemoTable group by StudentGrade order by StudentGrade;
Output
+--------------+-----------+ | StudentGrade | Frequency | +--------------+-----------+ | A | 2 | | B | 1 | | C | 2 | | F | 3 | +--------------+-----------+ 4 rows in set (0.00 sec)
Updated on: 2019-07-30T22:30:26+05:30
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