Request resources for crystal report or universal design.

Question

Hello Gurus,
         please instruct me how to learn formula in cystal report or  universal design ?  I have no business object to practice, please show me some web resource or helpful book.
Many thanks,

Answer 1

As a starter, formulas in CR are fairly simple
If test then result1 else result 2
The hard one to find in documentation is null or not null values:
if IsNull({field}) then ...
if not(IsNull({field})) then ...
Numbers and dates work with the above null tests, but some databases may need a test for text fields like
if {text field} = "" then ...
I use both for a SQL database as sometimes one works and some times the other:
if IsNull({text field}) or {text field} = ""  then ...
You can have multiple tests in a formula
If test1 then result1 else
If test2 then result2 else
If test3 then result3  else result4
and
If test1 and
test2 and
testt then result1 else result2
and
If test1 or
test2 or
test3 then result1 else result2
or you can nest tests
If test1
then
     If test2 then result2 else result 1
else
If test3 then result3  else result4