Get maximum age from records with similar student names in MySQL


For this, you can use GROUP BY along with aggregate function MAX(). Let us first create a table −

mysql> create table DemoTable1964
   (
   StudentName varchar(20),
   StudentAge int
   );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1964 values('Chris',23);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1964 values('David',34);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1964 values('Chris',27);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1964 values('Sam',31);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1964 values('David',32);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1964 values('David',37);
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1964;

This will produce the following output −

+-------------+------------+
| StudentName | StudentAge |
+-------------+------------+
| Chris       |         23 |
| David       |         34 |
| Chris       |         27 |
| Sam         |         31 |
| David       |         32 |
| David       |         37 |
+-------------+------------+
6 rows in set (0.00 sec)

Here is the query to get maximum age:

mysql> select StudentName,max(StudentAge) from DemoTable1964 group by StudentName;

This will produce the following output −

+-------------+-----------------+
| StudentName | max(StudentAge) |
+-------------+-----------------+
| Chris       |              27 |
| David       |              37 |
| Sam         |              31 |
+-------------+-----------------+
3 rows in set (0.00 sec)
raja
Published on 31-Dec-2019 07:31:10
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