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What's the most efficient way to pull data from MySQL so that it is formatted with duplicate values
For this, you can use GROUP_CONCAT(). Let us first create a table −
mysql> create table DemoTable1561 -> ( -> StudentName varchar(20), -> Title text -> ); Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1561 values('Adam','Learning Java');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1561 values('Bob','Learning C');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1561 values('Adam','Learning Spring and Hibernate Framework');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable1561 values('Carol','Learning MySQL from basic');
Query OK, 1 row affected (0.30 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1561;
This will produce the following output −
+-------------+-----------------------------------------+ | StudentName | Title | +-------------+-----------------------------------------+ | Adam | Learning Java | | Bob | Learning C | | Adam | Learning Spring and Hibernare Framework | | Carol | Learning MySQL from basic | +-------------+-----------------------------------------+ 4 rows in set (0.00 sec)
Here is the query to pull the data from MySQL so that it is formatted −
mysql> select StudentName,group_concat(Title separator ',') as FormattedOutput from DemoTable1561 -> group by StudentName;
This will produce the following output −
+-------------+-------------------------------------------------------+ | StudentName | FormattedOutput | +-------------+-------------------------------------------------------+ | Adam | Learning Java,Learning Spring and Hibernate Framework | | Bob | Learning C | | Carol | Learning MySQL from basic | +-------------+-------------------------------------------------------+ 3 rows in set (0.00 sec)
Updated on: 12-Dec-2019
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