[WD20] SQL - Add Days to Date [SOLVED] (2 replies)

I have an SQL query with a subselect that uses case statements to return Date and Days. Is there a way to add the Days to the Date and still have a valid Date?

The following code is as far as I have gotten. The last line won't work all the time.
20161105 + 30 days = 20161135 instead of 20161205. If I get rid of WL.Val() it appends the two expressions as strings (20161105 + 30 = 2016110530).

SELECT * FROM(
SELECT ID,CASE
WHEN Date3 <> '' THEN Date3
WHEN Date2 <> '' THEN Date2
WHEN Date1 <> '' THEN Date1 ELSE '' END AS Date, CASE
WHEN Date3 <> '' THEN Days3
WHEN Date2 <> '' THEN Days2
WHEN Date2 <> '' THEN Days1 ELSE '' END AS Days)
FROM Schedule WHERE Date <> '' AND Days <> '')
WHERE WL.Val(Date) + WL.Val(Days) > SUBSTRING(SysDate,0,8)