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Can we GROUP BY one column and select all data in MySQL?
Yes, you can use group_concat() for this. Let us first create a table −
mysql> create table groupByOneSelectAll -> ( -> StudentDetails varchar(100), -> StudentName varchar(100) -> ); Query OK, 0 rows affected (0.91 sec)
Following is the query to insert some records in the table using insert command −
mysql> insert into groupByOneSelectAll values('StudentFirstName','John');
Query OK, 1 row affected (0.14 sec)
mysql> insert into groupByOneSelectAll values('StudentFirstName','Chris');
Query OK, 1 row affected (0.21 sec)
mysql> insert into groupByOneSelectAll values('StudentFirstName','Robert');
Query OK, 1 row affected (0.65 sec)
mysql> insert into groupByOneSelectAll values('StudentFirstName','Bob');
Query OK, 1 row affected (0.13 sec)
mysql> insert into groupByOneSelectAll values('StudentFirstName','David');
Query OK, 1 row affected (0.15 sec)Following is the query to display all records from the table using select statement −
mysql> select * from groupByOneSelectAll;
This will produce the following output −
+------------------+-------------+ | StudentDetails | StudentName | +------------------+-------------+ | StudentFirstName | John | | StudentFirstName | Chris | | StudentFirstName | Robert | | StudentFirstName | Bob | | StudentFirstName | David | +------------------+-------------+ 5 rows in set (0.00 sec)
Following is the query to group by a single column −
mysql> select StudentDetails,group_concat(StudentName) from groupByOneSelectAll group by StudentDetails;
This will produce the following output −
+------------------+-----------------------------+ | StudentDetails | group_concat(StudentName) | +------------------+-----------------------------+ | StudentFirstName | John,Chris,Robert,Bob,David | +------------------+-----------------------------+ 1 row in set (0.05 sec)
Updated on: 30-Jul-2019
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