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Implement GREATEST() in MySQL and update the table?
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number int ); Query OK, 0 rows affected (0.64 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Number) values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Number) values(50); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Number) values(100); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(Number) values(190); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+--------+ | Id | Number | +----+--------+ | 1 | 10 | | 2 | 50 | | 3 | 100 | | 4 | 190 | +----+--------+ 4 rows in set (0.00 sec)
Following is the query to update greatest() in MySQL −
mysql> update DemoTable set Number=GREATEST(200,Number) WHERE Id=3; Query OK, 1 row affected (0.16 sec) Rows matched: 1 Changed: 1 Warnings: 0
Let us display table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+----+--------+ | Id | Number | +----+--------+ | 1 | 10 | | 2 | 50 | | 3 | 200 | | 4 | 190 | +----+--------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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