Question : How to construct if-else in this sql query?

I have complex query for oracle database, I simplify it as below

select a.platform, b.platform,  b.name...
from table1 a,
table2 b,
table3 c
where
....

Now I want to put a conditional statement
if a.platform ='Linux-PC' and b.platform='Linux, then select this select this record

How to do this meaning in the query?

Answer : How to construct if-else in this sql query?

that tutorial appears to use an older version, try the older version that has a seperate windows download

http://code.google.com/intl/iw-IL/webtoolkit/versions.html