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Get MAX() on column in two MySQL tables?
Use GREATEST() to find the maximum. Let us first create a table −
mysql> create table DemoTable1 ( Number int ); Query OK, 0 rows affected (0.52 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values(80); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable1 values(229); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1 values(575); Query OK, 1 row affected (0.24 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1;
Output
+--------+ | Number | +--------+ | 80 | | 229 | | 575 | +--------+ 3 rows in set (0.00 sec)
Following is the query to create second table −
mysql> create table DemoTable2 ( Number int ); Query OK, 0 rows affected (0.51 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2 values(485); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable2 values(10); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable2 values(475); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
Output
+--------+ | Number | +--------+ | 485 | | 10 | | 475 | +--------+ 3 rows in set (0.00 sec)
Following is the query to get MAX() on column in two tables −
mysql> select greatest((select max(Number) from DemoTable1),(select max(Number) from DemoTable2));
Output
+-----------------------------------------------------------------------------------------+ | greatest((select max(Number) from DemoTable1),(select max(Number) from DemoTable2)) | +-----------------------------------------------------------------------------------------+ | 575 | +-----------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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