Syntax error Find “greatest” between two columns and display with some records already null in MySql

Find “greatest” between two columns and display with some records already null in MySql

Let us first create a table −

mysql> create table DemoTable
   -> (
   -> Value1 int,
   -> Value2 int
   -> );
Query OK, 0 rows affected (0.77 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(78,89);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values(19,null);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable values(null,0);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values(null,95);
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 −

+--------+--------+
| Value1 | Value2 |
+--------+--------+
|     78 |     89 |
|     19 |   NULL |
|   NULL |      0 |
|   NULL |     95 |
+--------+--------+
4 rows in set (0.00 sec)

Here is the query to find the “greatest” from two columns −

mysql> select greatest(if(Value1 is null,0,Value1),if(Value2 is null,0,Value2)) from DemoTable;

This will produce the following output −

+-------------------------------------------------------------------+
| greatest(if(Value1 is null,0,Value1),if(Value2 is null,0,Value2)) |
+-------------------------------------------------------------------+
|                                                                89 |
|                                                                19 |
|                                                                 0 |
|                                                                95 |
+-------------------------------------------------------------------+
4 rows in set (0.00 sec)
Updated on: 2019-12-12T07:41:07+05:30

140 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements