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Display duplicate record as a distinct value with corresponding values as distinct comma separated list in MySQL?
For this, you can use GROUP_CONCAT(). You also need to use DISTINCT to fetch distinct records. Let us first create a table −
mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40), Score int ); Query OK, 0 rows affected (0.53 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name,Score) values('Chris',56);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(Name,Score) values('Robert',78);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,Score) values('Chris',56);
Query OK, 1 row affected (0.42 sec)
mysql> insert into DemoTable(Name,Score) values('Bob',89);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(Name,Score) values('Chris',56);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable(Name,Score) values('Chris',57);
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output. Here, we have repeated “Name” records with duplicate “Score” values −
+----+--------+-------+ | Id | Name | Score | +----+--------+-------+ | 1 | Chris | 56 | | 2 | Robert | 78 | | 3 | Chris | 56 | | 4 | Bob | 89 | | 5 | Chris | 56 | | 6 | Chris | 57 | +----+--------+-------+ 6 rows in set (0.00 sec)
Following is the query to loop record from the table which already uses GROUP BY −
mysql> select Name, group_concat(DISTINCT Score separator ',') from DemoTable group by Name;
This will produce the following output −
+--------+--------------------------------------------+ | Name | group_concat(DISTINCT Score separator ',') | +--------+--------------------------------------------+ | Bob | 89 | | Chris | 56,57 | | Robert | 78 | +--------+--------------------------------------------+ 3 rows in set (0.00 sec)
Updated on: 04-Oct-2019
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