What is the benefit of Enforce Join option in Crystal Reports?

Question

What is the benefit the makes SAP Crystal reports Enforce Join default option in Link Dialog is \"Not Enforced\"?

Is it performance issue? because I noticed if you d

Answer 1

The "enforced" part is used to FORCE the inclusion of tables that contain fields that are NOT used in the report/select conditions.

Well crap, that's what you said.

My understanding:

If you have two tables (tbl_A, tbl_B) w/ a link-able field, and you don't USE any field from the second table, it can be dropped from the select, and the "regular" effects of the join may disappear.

Select 
   'You're account is in default!' as Message,
   tbl_A.full_name, tbl_A.street_address, tbl_A.city, tbl_A.blah_blah
From
   all_customers tbl_A, 
   delinquent_accounts tbl_B
Where
   tbl_A.account_no = tbl_B.account_no

Without the enforced join, might wind up as

Select 
   'You're account is in default!' as Message,
   tbl_A.full_name, tbl_A.street_address, tbl_A.city, tbl_A.blah_blah
From
   all_customers tbl_A, 

In other words, you might wind up setting dunning letters to your whole customer base instead of just the delinquent accounts. (Which is why we test reports before implementing them, I guess).