Oracle---------the largest column in a value two column in SQL

1. A B C is in the table three columns, with SQL Statement implementation: When a column is greater than B Select a When column column otherwise select B column, when B column is greater than C Select B when column column otherwise select C column.

Select ( case if a>thenelseend), ( case when B >  Then Else End  from table;

2. The explanation of case is as follows:

Case Statement

Case expression When condition 1 then return value 1

When condition 2 then return value 2
.
.
.
When condition n then return value n
ELSE return value
END

Oracle---------the largest column in a value two column in SQL