Select the maximum for each value in a MySQL table?

For this, use GROUP BY clause along with MAX(). Let us first create a table −

mysql> create table DemoTable    -> (    -> CountryName varchar(20),    -> Population int    -> ); Query OK, 0 rows affected (0.56 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('US',560); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values('UK',10090); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('UK',8794); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('US',1090); Query OK, 1 row affected (0.21 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------------+------------+ | CountryName | Population | +-------------+------------+ | US          |        560 | | UK          |      10090 | | UK          |       8794 | | US          |       1090 | +-------------+------------+ 4 rows in set (0.00 sec)

Following is the query to select the maximum for each value in a MySQL table −

mysql> select CountryName,max(Population) from DemoTable group by CountryName;

This will produce the following output −

+-------------+-----------------+ | CountryName | max(Population) | +-------------+-----------------+ | US          |            1090 | | UK          |           10090 | +-------------+-----------------+ 2 rows in set (0.00 sec)