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How to perform conditional GROUP BY in MySQL to fetch?
Let us first create a table −
mysql> create table DemoTable ( StudentName varchar(40), StudentMarks int ); Query OK, 0 rows affected (0.64 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John',78);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('Chris',48);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('John',67);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Chris',89);
Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output. Here, we have some duplicate student names like the student “John” with marks 78 and 67 −
+-------------+--------------+ | StudentName | StudentMarks | +-------------+--------------+ | John | 78 | | Chris | 48 | | John | 67 | | Chris | 89 | +-------------+--------------+ 4 rows in set (0.00 sec)
Following is the query to perform conditional GROUP BY and display distinct Student Name with maximum marks. For example, student “John” with maximum marks 78 −
mysql> select StudentName,Max(StudentMarks) AS StudentMarks from DemoTable group by StudentName;
This will produce the following output −
+-------------+--------------+ | StudentName | StudentMarks | +-------------+--------------+ | John | 78 | | Chris | 89 | +-------------+--------------+ 2 rows in set (0.00 sec)
Updated on: 01-Oct-2019
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