Return a list from different rows into a single field with MySQL

For this, use GROUP_CONCAT(). Let us first create a table −

mysql> create table DemoTable2024
   -> (
   -> SubjectName varchar(20),
   -> StudentName varchar(20)
   -> );
Query OK, 0 rows affected (0.62 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable2024 values('MySQL','Chris');
Query OK, 1 row affected (0.13 sec)

mysql> insert into DemoTable2024 values('MySQL','David');
Query OK, 1 row affected (0.12 sec)

mysql> insert into DemoTable2024 values('MongoDB','Bob');
Query OK, 1 row affected (0.11 sec)

mysql> insert into DemoTable2024 values('Java','Sam');
Query OK, 1 row affected (0.18 sec)

mysql> insert into DemoTable2024 values('MongoDB','Mike');
Query OK, 1 row affected (0.17 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable2024;

This will produce the following output −

+-------------+-------------+
| SubjectName | StudentName |
+-------------+-------------+
| MySQL       | Chris       |
| MySQL       | David       |
| MongoDB     | Bob         |
| Java        | Sam         |
| MongoDB     | Mike        |
+-------------+-------------+
5 rows in set (0.00 sec)

Following is the query to return a list from different rows into a single field −

mysql> select SubjectName,group_concat(StudentName)
   -> from DemoTable2024
   -> group by SubjectName;

This will produce the following output −

+-------------+---------------------------+
| SubjectName | group_concat(StudentName) |
+-------------+---------------------------+
| Java        | Sam                       |
| MongoDB     | Bob,Mike                  |
| MySQL       | Chris,David               |
+-------------+---------------------------+
3 rows in set (0.06 sec)

AmitDiwan

Published on 06-Apr-2020 13:28:03

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