Deriving 1 Value from 2 Fields Based on Values in Fields

Question

I have a query that needs to return 1 of my values based on the values from 2 fields from 2 tables. However, the value should only be returned in 1 field and one of the fields should be evaluated first. If this first evaluated field has a certain value ('Y') then the other field is ignored.
To be more clear, per the normal query below, what I want is to somehow, if possible, combine the case t2.el_contr and case t1.contr_type statements so that one field, say: mbr_contr_type_desc returns a value.
So that if the value of t2.el_contr is 'Y' then 'SUB CHILD' is returned. It is important that this field should be evaluated first (If the value of it is 'Y' then the other field evaluation can be ignored). If this is not 'Y', then t1.contr_type should be evaluated and the values as listed below also returned to mbr_contr_type_desc.
I know the following isn't correct, but it might better illustrate what I'm trying to do (the normal query is below this)
case t2.el_contr
when 'Y' then 'SUB CHILD'
case t1.contr_type
when 'A' then '1 PARTY MALE SUB'
when 'B' then '1 PARTY FEMALE SUB'
when 'C' then '2 PARTY MALE SUB'
when 'D' then '2 PARTY FEMALE SUB'
when 'F' then 'FAMILY MALE SUB'
when 'G' then 'FAMILY FEMALE SUB'
end as mbr_contr_type_desc
In an Access query I would do the following in a column:
iif([el_contr]='Y',"SUB CHILD',SWITCH([contr_type]="A","1 PARTY MALE SUB",[contr_type]="B" etc.))
*NORMAL QUERY*
select t1.ssn
t1.type,
t1.grp_id,
t1.contr_type,
t2.el_contr,
case t2.el_contr
when 'Y' then 'SUB CHILD'
end as mbr_contr_type_desc_2,
case t1.contr_type
when 'A' then '1 PARTY MALE SUB'
when 'B' then '1 PARTY FEMALE SUB'
when 'C' then '2 PARTY MALE SUB'
when 'D' then '2 PARTY FEMALE SUB'
when 'F' then 'FAMILY MALE SUB'
when 'G' then 'FAMILY FEMALE SUB'
end as mbr_contr_type_desc_1
from member_elig t1
inner join grp_master t2 on
t1.grp_id = t2.grp_id

Answer 1

Perfect!
Thanks, didn't know that existed. Still learning my way around pl/sql..
One other (unrelated) question..when i hit the CTRL+LEFT ARROW* button in my SQL window, it will not tab back. This is really annoying! I have looked through PREFERENCES-EDITOR and can't seem to find any setting that will allow this. Do you know of any way to change this so I can tab backwards/fowards through code in the SQL window?
Thanks for any suggestions!
*Or CTRL+RIGHT ARROW for that matter..