how to get max value of 4 column

Hi i have one table . in that table 8 column 4 cloumn are numeric cloum . i want to get max value of that 4 cloumn

Fname     lName    tname    country  n1   n2    n3 n4
Sathish    kumar     ML           India     4    8       9    10
Kumar      Siva       ML           inida     7    6        4     12

if i run the query means i want to get  
12   as result

How to get that ??
LVL 20
Sathish David  Kumar NArchitectAsked:
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slightwv (䄆 Netminder) Commented:
select greatest(n1,n2,n3,n4)  from table;

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