Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
MySQL query to group by names and display the count in a new column
Use GROUP BY with the COUNT() method. Group the names with GROUP BY and count using the COUNT() method. Let us first create a table −
mysql> create table DemoTable ( Name varchar(30) ); Query OK, 0 rows affected (0.63 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Chris');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('Mike');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values('Mike');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values('David');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------+ | Name | +--------+ | Chris | | Robert | | Mike | | Robert | | Mike | | David | +--------+ 6 rows in set (0.00 sec)
Following is the query to group by names and display the count −
mysql> select Name,count(Name) as NumberOfRowsPerName from DemoTable group by Name;
This will produce the following output −
+--------+---------------------+ | Name | NumberOfRowsPerName | +--------+---------------------+ | Chris | 1 | | Robert | 2 | | Mike | 2 | | David | 1 | +--------+---------------------+ 4 rows in set (0.00 sec)
Updated on: 09-Oct-2019
580 Views
Advertisements